Electrochemistry - Science topic

I would like to understand how we can apply electrochemistry in minimizing pollution and waste

Hi researchers. I have deposited a polymer, PANI on Glassy carbon electrode by electrodeposition method. CV results of It showing only the oxidation peak taken in 100mM ferri+ferro solution in 0.1M KCl solution. Why is it so. how can I resolve it?

Hello,

My lab recently acquired a combination ORP electrode, with the refrence being Ag/AgCl and the working electrode being platinum.

We are hoping to use this electrode to measure the reduction potential of buffers prepared using biologically active compounds, such as GSH and GSSG and probe redox active systems by artificially setting the potential.

Recently, I was trying to validate the electrode by preparing 1 mM total concentration solutions of varying ratios of GSH and GSSG. This was done as, to my understanding regardless of concentration the ratio of Ox vs Red determines the potential value of the solution via the Nernst Equation. However the readings I got were all positive, and nowhere close to the expected potential, even when correcting for the electrode difference between Ag/AgCl and SHE.

Secondly, in 1x PBS pH 7.4, I added increasing amounts of BME up to 1 M and got an exponential decay like curve asymptotically approaching ~-120 (SHE) mV.

I am having trouble making sense of these results, namely the GSH vs GSSG ratio, and why the readings would not follow the nersnt equation.

Can anyone explain how to use these ORP electrodes, and where I may be going wrong in these experiments? All the information I can find online are referring to waste water treatment.

In some electrochemistry research papers, the result obtained from a differential pulse voltammetry (DPV) technique is presented in peak current vs. log(concentration) plot. in such cases, how to calculate sensitivity, LoD and LoQ from that data? Also what about their "unit"?

Hello,

for my master thesis i need to write a section about electrochemical potential

what is it and its unflunce on the electrochemical cell.

could any one of you please give me some refrences which could help!

thanx

Need assistance in setting experimental setup

In an electrochemical cell with Na2SO4 as electrolyte, I ran a comsol simulation with secondary current distribution and transport of diluted species. The results showed that Sulphate ions (SO42-) are moving towards the cathode(-vely charged). On the cathode hydrogen peroxide is generating via 4 e- oxygen reduction reaction and at anode water splitting is happening.

Can anyone help me how to investigate this phenomena?

Electrode well with respect to electronics and electrochemistry, electrophysiology.

After performing boehm titration using HCl,NaOH, Na₂CO₃, and NaHCO_3.  I want to know the formula to calculate functional groups.

What's the difference between OCP and OCV in electrochemistry?

Dear All,

I have been trying to use BioLogic Electrochemical Equipment to investigate my gravimetric capacity. I am aware that the capacity would be divided by the mass of the active working electrode. But I am wondering which of the parameters is actually my Q from the attached image below? Any suggestion is welcome.

Hello everyone!

I'm about to start a research grant on energy storage materials. The first task is to replicate the results of a paper where they used DFT and MD calculations (with VASP) to simulate the interaction of a gas adsorbing onto a Li slab. (Stephan L. Koch, Journal of Power Sources, 2015, DOI: 10.1016/j.jpowsour.2015.07.027, Pages 150-161)

I have little experience with DFT calculations (although with Gaussian), but none with MD and VASP. Additionally, my university doesn't have a license for VASP.

Could you suggest valid alternatives to VASP and provide some teaching materials on how to use the software for these types of calculations?

Thank you very much!

Greetings! I've been asked to fabricate a few ultramicroelectrodes made of thin PtIr (90/10) wire with etched tip, sealed in melted polymer based on ethylene-vinyl acetate (EVA) in a way that only the very apex of the tip is exposed. The geometry of such UME is expected to be conical/hemispherical. My question is whether it is possible to clean the surface of such microelectrode after the experiment. Since my sealing material is based on EVA I am worried what kind of treatment it is able to withstand. What I have read (https://cdnimages.opentip.com/Docs/BII/EVA_Chemical_Chart.pdf), EVA is relatively low-resistant to various organic and inorganic chemicals. I assume my sealing will have very similar properties, not to mention the material is rather soft/rubber-like as well. Mechanical polishing is out of question, obviously. In case of ultrasonication I'm afraid that vibrations may damage the insulation near the apex-sealing interface, causing it to detach and allowing the liquid to leak in. Electrochemical cleaning involves gas bubbles evolution on the electrode surface, which may also lead to sealing detachment mentioned above. The only way that comes to my mind is to soak it into a diluted acid solution for several minutes or hours and then rinse it thoroughly with distilled water, but I am not sure how effective this may be. Any suggestions or recommendations what else I could try?

Recently, the term battery efficiency has been found in the literature. how do we calculate this value, and from which graph do we estimate this energy efficiency? Is there any standard value for energy efficiency to compare with? Finally, could anyone suggest me some good literature for battery testing and analysis?

Ref: 10.1021/acs.chemmater.6b02895

I was running potentiodynamic test, while the test I got overload ( I overload and CA overload). based on Gamry maybe the surface area is too big so the potentiostat cannot measure the current, because I'm sure about wires connections. 

by the way, when I get this issue the test is stopped, and I should make F2 skip.

My question is related to electrochemistry. Let's suppose I have X material, and that material only shows an oxidation peak in any electrolyte, e.g., PBS, HCl, H2SO4, KOH, etc. In the case of the Ferro/Ferri solution, first I run the bare electrode, which shows a redox potential, and then I run the material-modified electrode in the Ferro/Ferri solution. In this case, does it increase the only oxidation peak or both?

The pH range of a borate-phosphate buffer solution can be taken as the range of the phosphate and borate buffers separately?

I need resources that explain ways to combine membrane separation and electrochemical technologies for wastewater treatment. Explain fully including advantages and disadvantages, reactions and how to combine.

I am working on CO2 and nitrite (NO2-) co-electrochemical reduction to produce urea. I've tried several catalysts (some similar to those from papers), but none of them is capable of producing urea.

I use 1H NMR to detect urea, and the proton peak of urea is at ~5.6 ppm. But in some catalysts, one peak appears at ~7.4 ppm, which can be originated from the proton in -CONH2 group. Besides, there are no other peaks. So I don't know what this product is.

Does anybody have any idea what it might be? Or maybe someone working on this topic may have the same problem?

Thank you.

I want to measure ionic conductivity of my oxide solid-electrolyte so I assembled a half-cell with gold blocking electrodes in Swagelok cell. You can see the EIS result attached. I am confused which part of the semicircle should I take into consideration. Left part or right part? I was taking the intersection point of the semi-circle with the Warburg line on the X axis but in some papers I see people are doing different stuff with fitting etc. Also, what would be the best equivalent circuit to fit this system?

hello everyone..!

I want to ask whenever I perform EIS for Na||Na symmetrical cells the Nyquist plot is something like shown in figure but in literature there is perfect semi circle. this in raw data no equivalent circuit is applied.

Note: I am new in electrochemistry

Using potentiometer and its techniques.

Electrochemical noise (EN) is a non-destructive test (NDT) for corrosion testing of substrates unlike cyclic polarisation and electrochemical impedance spectroscopy which are destructive.

I want to perform pulse electrolysis, but I am unsure which program I need to run in the electrochemical workstation.

Thanks

I am researching layered oxide anode materials for sodium-ion batteries.

In the last experiment, I manufactured a coin cell (CR2032) using a Na(Ni1/3Fe1/3Mn1/3)O2 anode and a sodium metal cathode and conducted a charge/discharge test. At this time, the positive electrode was produced by mixing the active material, conductive material, and binder in a ratio of 8:1:1 with NMP and coating it on Al foil. The electrolyte was 1M NaPF6 in EC:PC (1:1) with 2% FEC, and the separator was a glass fiber filter. The assembled cell was kept at 25 degrees for one day. Afterward, I set the voltage range to 2.0~4.0V and started charging at 0.1C.

However, when I checked two days later, the cell did not reach 4.0V during the first charging process. When I checked the charge/discharge curve, I found that it showed a tortuous curve around 3.5~3.8V and could not go up any further. Although this problem did not appear in all cells, it occurred intermittently in subsequent experiments.

Why does this happen? Is this phenomenon related to SEI formation, electrode wettability, electrolyte composition, or Na dendrite? I would like to get advice from people with similar experiences or related experts.

Please need help of all electrochemistry experts.

Dear all!

I think the main functions of pores are to avoid the contact of the two different liquids and just allow the passage of ions, so I think the pore size should be small enough to block the liquid, although the solvated ions must pass through it.

For glass frits, in the following link, you can find a table showing the different nominal ranges of pore sizes in micrometers

Best

Marco

Dear colleagues,

I am having some doubts about how to correctly discuss the Tafel slopes. By definition, they show how much it would be necessary to increase the overpotential to increase the reaction rate by a factor 10. As a consequence, a high Tafel slope indicates that a high amount of energy would be necessary for a reaction to occur, which means a slow reaction rate. This is particularly correct if we see a potentiodynamic polarization curve where E is at y-axis and log(j) at x-axis. Nevertheless, if we put the graphic in the most correct form, i.e., E at x-axis and log(j) at y-axis, this does not work, since a high Tafel slope would indicate that a little voltage difference would imply in high current density variation (i.e., a "faster" rate). So, my question is, what is the correct way to interpret the Tafel slopes?

Thank you all in advance.

NOVA software used in Electrochemical Impedans Spectroscopy for fitting the Nyquist plot of FRA measurements.Thank you

I want to know, is there any correlation between the Pt-OH formation and the ECSA of Pt during the CV studies in 0.5 M H2SO4 in N2 atm at 25 deg C.

Pt has been remarkable Hydrogen Evolution Reaction electrocatalyst in Acid which perform good even in large scale electrolysers.

While there are plenty of engineered HER catalyst reports most of them fail at reasonably high currents and long term testing. I wonder if there is any catalyst with higher intrinsic activity than Pt?

Thanks

Electrochemical active surface area (ECSA) from CV or EIS

Dear all

I am trying to do an electrochemical detection of cholesterol and triglyceride, so kindly help me with some valuable inputs. Kindly help me with some reference for the same .

Thank You In Advance

I am studying about triboelectricity, and I have a question why some open circuit voltages some out as single-peak and some output voltages comes out as double-peak.

1. The first one has only one peak which shows both the voltage for contacting and separating in one peak. For example, the positive slope represents pressing, and the negative slope in the peak represents releasing.

2. The second one has two peaks that have opposite signs to each other. For example, when pressing, the voltage shows distinct positive peak. Then the voltage comes to equilibrium. And then when released, the voltage has a negative peak. After that, the voltage comes to equilibrium.

I want to know what is the difference between those two.

Thank you.

Anne, A.; Daninos, S.; Moiroux, J.; Bourdillon, C.

Electrochemical reduction of alpha-ketoglutarate in the presence of ammonia as a means of achieving selectively the reductive amination to glutamate—Thermodynamic and kinetic characteristics of the keto imine equilibrium. New J. Chem. 1994, 18, 1169–1174.

in my studies for PbO2 electrodeposition after adding an additive (NaF) in to the matrix which only includes lead nitrate, a peak shift happened in the reduction area. would you please help me by explaining what is the reason?

you may also see the CV data in the following picture.

Thank you in advance for your help.

Hello everyone! I am here to ask a question again. I am going to start making coating for my electrodes and I know that, for this, I need nafion. However, when I search for this product, sellers show me two options, only nafion and nafion resin and I don´t know what it is the correct product for my purpouse. If someone is able to indicate me what is the best option, I will be very gratefull with that person! Thanks a lot in advance!

Shape is strange and I may not able to explain this with an equivalent circuit. So, please some one can help me to explain with proper electrochemistry?

This results came for Supercapacitor measurements

I have repeat this and I continuously got this shape, ensure it wasn't mistake

It's as a simple or complicated question as follows. After we published 2001 a certain article in Electrochimica Acta (https://doi.org/10.1016/S0013-4686(01)00738-1), where we showed in our recent article (10.1016/j.electacta.2023.142458) that the charge storage process in oxides containing transition metals (TMOs) could be a physical process without restrictions due to mass transport, now with new "insights", we publish this article below where a new theoretical model for TMOs yields different equations contemplating the different electrochemical techniques (e.g., voltammetry, chrono-methods, and impedance). It was demonstrated, comparing with renowned works (e.g., Trasatti et al. - more than 1100 citations and De Levie - more than 1400 citations) that in the specific case of TMOs, widely used in Energy Storage Devices, that the proposed model in this our work allows a "complete interpretation" of the main phenomena occurring during the charge/discharge process in Supercapacitors. On the contrary, the famous models of Trasatti and De Levie completely fail in the light of the present work.

We also validated the proposed model in carbon-based materials such as Activated Carbon and Pressed Nanotubes. See our work below using Chronocoulometry and Chronoamperometry, respectively:

(Lenon et al.) https://doi.org/10.1016/j.jelechem.2022.117140

(Pinzón et al.) https://doi.org/10.1016/j.est.2023.106858

Link for free access from the Publisher valid for 50 days:

In addition to the published paper, I am feeling the necessity to clarify some points not considered explicitly by us of historical relevance and important consequences as is the misinterpretations of the charge-storage process in Pseudocapacitors committed by several authors. The history behind the attempt to explain the theoretical basis of the pseudocapacitance in TMO (or DSA) electrode materials has two major authors, Professor S. Trasatti and Professor B.E. Conway. To quote, Trasatti (Italy) and Conway (Canada) were two of the greatest Electrochemists of the phase called “Modern Electrochemistry” together with Delahay, Sluyters, Vetter, Parsons, Savèant, Oldham, De Levie, Lasia, Bockris, Bard, among others. However, Professor Trasatti, who proposed the Protonic Condenser model for TMOs, always insisted on an intuitive (ad hoc) method of analysis. In this way, he and his co-workers completely failed to obtain significant “quantitative simulations” for the dependence of voltammetric charge as a function of the scan rate (CV technique) by using the equation q = a + b/[root(scan rate)] and/or 1/q = c + d[root(scan rate)], that is, Trasatti et al. used the charge referring to cyclic voltammetry, even knowing that there is no way to perform the analytical integration of the Randles-Sevckic model to obtain the theoretical charge-scan rate dependency for reversible systems. The use by several authors of this model proposed in 1989 led to numerous errors in the literature. The largest of these errors culminates in the model commonly known as Dunn’s model which is used to decouple the capacitive charge contribution and its faradaic counterpart controlled by diffusion mass-transport. These last authors committed the gross error of assuming that the slope in your equation, i-total/(scan rate root) = (ic)x(scan rate root) + (if), does not vary with the electrode potential, which is impossible according to the CV theory, i.e., the so-called “current function – Xsi(pi-time)” varies for each potential/voltage value. In the case of Professor Conway’s works dealing with pseudocapacitors, he tried to explain using the impedance technique (EIS) by applying "non-blocked" equivalent circuits composed of two distinct time constants (see the models in his classic book on SCs) to include in an "ad hoc" way his classical models developed between 1960-1970 related to "pseudocapacitance adsorption" using the CV technique. Then, using the so-called "brush model", he unsuccessfully tried to explain the phenomena of an electrical double layer linked to surface roughness with cyclic voltammetry using a single time constant. On the contrary, between 2014-2017, Saveànt et al. published important articles where they proposed that capacitance and pseudocapacitance are equivalent (indistinguishable) events. However, these authors were not concerned with the "roughness/porosity” factors, thus leaving behind the aspects related to the resistances and capacitances distributed into pores/cracks. Bearing all this short history in mind, our present article published in April 2023 innovatively addressed the fundamental aspects of pseudocapacitors that were not properly, intentionally, or not, considered by several prominent authors. Finally, our article tried to unify using a simplified model the use of the different electrochemical techniques in light of a single theoretical premise. It is worth mentioning that Professor A. Lasia previously considered some fails in De Levie’s model, when applied to real electrodes containing an assembly of pores, by including the capacitance referring to the flat regions connecting the individual pores as a parallel combination (Ctotal = Cporous + Cflat). This is necessary since De Levie proposed analytical solutions for single pores.

If we wish to test corrosion of metallic materials in the HF solution then which reference electrode should be the choice

what factors should we consider to choose the reference electrode for concentrated acidic solutions?

Hi,

I recently did the plasma electrolytic oxidation coatings on Ti6Al4V and Ti6Al7Nb. When it comes to potentiodynamic tests - they're getting stuck because of the curve is below 0 current density and the polarization resistance is about 1,5 MOhm. The curve is reversed compared to that for normal tests. When I took my multimeter - it show that the coating don't conduct the electricity into the metal. Does it means that the corrosion cannot take place on that coating?

Best regards

I am trying to figure out what type of corrosion cell we can use to carry out corrosion experiment in hydrofluoric acid. I am afraid if I prepare samples in epoxy it will cover the surface and coating will no longer be tested. Moreover, my electrolyte is very expensive, so is there any suggested cell design I can use which require very less electrolyte and also resistant to HF.

Dear researchers,

I am writing to request assistance in estimating the E1/2 for an irreversible process from CV. During our experiment, we observed an oxidation peak. While it is easy to estimate E1/2 for a reversible process, I am struggling to find a method for estimating E1/2 for an irreversible process. Could anyone kindly offer their knowledge and expertise to help me with this matter?

Hi dear friends

I'm challenged with a problem. I investigated scan rate effects for an electrochemical sensor. I found that the behavior of current with scan rate and the square root of scan rate is linear for them simultaneously (R2 for both approximately 0.99). My first question is, can I report both processes? My second question is for kinetic investigation, which equation is proper for calculating alpha(electron transfer coefficient) and n(number of electrons)?

For hydrogen fuel in motor or car engine.

I recently came across literature that analyzes degradation in a solid oxide electrolysis cell using something called ADIS plots. (Analysis of the differences in impedance spectra). I am a bit confused on why such a analysis is required when similar information can be gathered from a bode plot.

Why is the impedance reported in such way?

Ebbesen, Sune D., et al. "Poisoning of solid oxide electrolysis cells by impurities." Journal of The Electrochemical Society 157.10 (2010): B1419.

Sun, Xiufu, et al. "Durability of solid oxide electrolysis cells for syngas production." Journal of The Electrochemical Society 160.9 (2013): F1074.

so I am doing UV-Vis electrochemistry and wants to see the reversibility of the hydrogen bond between diphenyl urea and the 1,4- dinitrobenzene. what changes i can expect in the absorption spectra after applying potential?

I have developed LiNi0.5Mn1.5O4 (LNMO) material and tested it in half-cell (LNMO vs. Li/Li+) and works perfectly as shown in the picture attached.

However, when I used the same material to make a full cell (LNMO vs. graphite), it showed strange behaviour as can be seen in the voltage vs. time plot in the attachment. What can be the possible reasons? The data shown is for the formation cycle, where the current equivalent to C/10 was applied for both charge and discharge.

Note: I made some similar materials, and for them, the full-cells worked perfectly.

Graphite = 3 mAh cm^-2

LNMO = 2.5 mAh cm^-2

N/P around 1.2

Glass fibre as a separator

1M LiPF₆ EC:DMC 1:1 wt.% as electrolyte

Half-cell parameters:

LNMO = 1.2 mAh cm^-2

Glass fibre as a separator

1M LiPF₆ EC:DMC 1:1 wt.% as electrolyte

I want to do BET surface area analysis of Ni foam sample. what will be the degassing time and temperature and number of points to be consider for analysis. and any other specific details to follow?

I am trying to coat conducting materials like graphite, graphene, graphene oxide on glassy carbon electrode, but the coating is unstable and uniform. I have been using PVDF as binding agent and i have tried various solvents to disperse GO, rGO and graphite.

The coating is very fragile and some times get removed easily.

I am working in electrochemistry. please suggest . I am totally clueless.

I am doing electrochemical CO2 reduction by using bi-metallic at volatge window -2 to -1 Vs Ag/AgCl. I am getting LSV with too much fluctuations and when i do it at -1 to 0 Vs Ag/AgCl i get proper LSV Without fluctuations. Is it possible that we do it at [-1,0] voltage window?

And what's the problem as we go towards -2 ?

I need to create an electrode of Au nanoparticles deposited on a metal support as stainless steel or Pt. How can I do it easily and using few reagents?

Hello ! I am currently interested in organic radicals and I asked myself few questions in the field of electrochemistry for these kind of molecules.

I am not an expert in electrochemistry but I used to study several dyes by cyclic voltametry, especially to determine the HOMO and LUMO level related to oxidation and reduction peaks and to check the electrochemical stability.

However, I was wondering what would be the meaning of these peaks for a stable radical in CV. One orbital is semi-full (SOMO) so I would expect to have the reduction and oxidation peaks really close due to the removal of an electron in the SOMO (for the oxidation) and the addition of an electron in the SOMO (reduction) and the traditional «HOMO / LUMO» peaks at higher / lower potential. However I've seen few publications showing two distinct oxidation / reduction peak by CV far from each other and related them with HOMO LUMO level (not SOMO).

Could you enlightened me about this ?

Thanks a lot

We are planning to study the electrochemical property of sputtered nickel film. What types of electrodes should we use to perform the cyclic voltammetry of the film with KOH electrolyte?

I have a question regarding the evaluation of electrochemical sensors. In particular, I would like to know how to read chronoamperometry graphs.

In chronoamperometry, where the amount of target is measured in increasing and decreasing drops, is it possible for the current value to increase in an upward staircase-like fashion when a reduction reaction occurs?

I thought that the current value increases in an upward staircase fashion during oxidation reactions and decreases in a downward staircase fashion during reduction reactions.

Please point out if I am wrong. I would be happy if you could correct me.

I am just starting to learn electrochemistry, so I am sorry for this question.

Thank you.

My lab has bought an Ru/C sample which has a moisture content of about ten percent while packing. I want to know whether there is any way of reducing the moisture content of the sample before using it, in order to get an enhanced performance in water electrolysis

Hi....I need someone to guide me to do the analysis and calculations of EIS. I have did this test, however, the imaginary data points were positive and negative. Is this true or there was something wrong. Please, clarify this point for me

Hello research family...!

I am working on Nanostructured electrode materials for the applications of rechargeable batteries and supercapacitors for my research I need to learn simulation in COMSOL. I am interested in CV, GCD, and EIS plots in the electrochemistry module. Kindly help me to learn and suggest some videos/books/materials that help my research.

Thank you

I cannot seem to find the one-electron reduction potential for t-butylhydroperoxide (TBHP). I have found the 2 electron reduction potential, but not one.

Bulletin of Electrochemistry 16 (6) June 2000, pp 277-279

CYCLIC VOLTAMMETRIC STUDIES ON THE ELECTROREDUCTION OF PEROXIDES IN APROTIC MEDIA

Can someone help me with this value? Thanks.

If the answer to the question is yes, is it any reactions between Glucose solution (electrolyte) and Pd that might happen?

If current intensity is an additive property in voltammograms, then is the current intensity that is recorded at a potential greater than that of water oxidation a result of the oxidation of all species that oxidize at that potential? That is, if we have that water oxidation starts at 1.23 V and a species A is oxidized at 1.30 V, then the current measured at 1.30 V contains a contribution from water and species A?

Dear All,

I am performing a CV analysis of Ferrocene and I obtained good CV graphs but when I come to calculate the inidic peak current, cathodic peak current and other parameter, the software does not show me a reliable data as I use the automatic system to get the data and I am wondering if anybody knows how to obtain these items manually!

Looking forward to hearing your kind responses!

Mohammad. 

Hello all,

I am currently developping an electrochemical sensor and I have this Ag electrode that I would like you to turn into a Ag/AgCl one.

Due to the sensor design, I can't use the Ag electrode as a working electrode to electrochemically generate AgCl in Cl- solution as it is usually done.

My strategy is to generate AgCl chemically but I can't figure out to do this. Do you know a way ? Thanks in advance for your help.

I am researching about fuel cell and developing the electrode made by CNT paper (Bucky paper).

My cyclic voltammetric system is 2-electrode system - Bucky paper working electrode and Ag/AgCl reference electrode with N2 purging in 0.1M H2SO4 solution.

I attached the scheme of my system (figure 1).

But when I applied the voltage like the figure 2, I could get only the result like the figure 3.

I also found that when I applied the relatively wider voltage range (ex;-1~1V), this phenomenon did not occur. Only relatively narrower voltage range (ex;0~0.1V) resulted in this kinds of problem.

How to fix my unusual cyclic voltammetric result?

Hi everyone

I'm looking for Laviron's equation for adsorption controlled process, could anyone help me?

thanks

What is the advantage or usefulness of recording voltammograms with potential sweeps using the OCP as a reference instead of the reference electrode potential?

Hi all,

I am really new to electrochemistry and I am recently trying to reproduce the cyclic voltammetry of Pt electrode that I made using sputtering. I used Ag/AgCl as reference, coil Pt as counter and my Pt electrode roughly 3x3 mm² as the working electrode. The CV graph that I got is quit different from what we usually see on lots of literatures. see the attachment

Could someone please help with this.

Many thanks

What material is proper for current collector for KOH electrolyte three electrode test system? Al, Ni Or what?

If I use TiO2 sensors for quantification of organic matter in a matrix where quantification using this photocatalytic substance has not been tested, would this be a good topic for an article? I know there are many articles on the use of TiO2 for sensing applications, and obviously this is not a recent topic. But are these sensors still a good option and a valuable research topic?

Hello,

I wanted to ask if anyone has some experience and would be able to help me with the calculation of diffusion coefficient in hydrogels. I am measuring the electrochemical reduction of oxygen via amperometry at -300 mV on platinum electrode vs. calomel. Hydrogels (three types) are seeded on the electrodes in 6, 4, and 2 mm thick cylinder. From the results, I can tell which hydrogels have the lowest value of current vs. control, but I am not sure how to get the dissociation coefficients... I appreciate your help.

I am new to electrochemistry. I want to understand the graphs like CV, GCD. and also unable to read voltage (V) vs. specific capacity (mAh/g), capacity (mA/g) vs. cycle number etc.

where to learn these thing from the sketch. please suggest me some materials or journal papers.

Hello,

I wonder why the purple circle part reaction(current drop) occurs in the OER LSV curve.

I captured it from DOI: 10.1039/c9ee02388g, Figure 3a.

Thank you.

i have uploaded image about question.i want to design some biosensor in electrochemistry. i need two chemical molecules (A & B). A is conjugated on a surface by some linker and B is connected to a electrode surface. when the linker breaks, A and B should joint each other especially with targeted linkage. A should have a property to induce electric current in B.

please guide me which molecules can be A and B?

Hello,

In PEM Fuel Cell electrocatalysts, how does Electrochemical Surface Area (ECSA) relate to the mass activity? Do these parameters have any interconnection between them?

Thank you.