my working electrode is graphite sheet and I'm using Ag/AgCl and pt electrode as reference and counter. I have problem with my solution. in some articles, they have used PBS + KCl solution and they observe the redox peaks. in some other works, they use PBS + KCl + K3[Fe(CN)]6 and they see peaks as well.
I already use PBS + KCl solution but I didn't see any peaks for redox reactions and I have a lot of noise in my CV curve.
I don't know what solution is gonna work for me.
mainly I'm working on a microbial fuel cell and I need to analyze my electrode to see its performance. so I have to run a CV test. and my solvent is deionized water
Please Dear Alireza Mousavi
What is the purpose of your work ? . What is the range of applied potential ?
Kafia OULMI
I want to analyze my electrode to see if it is good for my microbial fuel cell or not. so I need to run a CV test with it.
my potential range is between +600 and -800 mV.
my main question is that what is the purpose of using K3[Fe(CN)]6 in the solution?
does it cause the redox reaction or it just show it? ( I assume that the redox reaction is very low so it is not visible in the CV curve and we have to use K3[Fe(CN)]6 for showing it better )
In the absence of the redox active ferro/ferricyanide, you would not expect any peaks in the CV unless (i) dissolved O2 has not been removed and the potential range includes negative excursions or (ii) the graphite had been oxidised and had quinone groups. The potential limits, the range in which no voltammetric features are observed (because nothing is being oxidised or reduced) depends on the pH, but potentials more positive than ca. +0.8 V to Ag/AgCl/ 3M KCl could oxidise the graphite and >1.0 V or so could electrolyse the water to O2 and protons.
Please Dear Alireza Mousavi
try to see the paper .
Article A Practical Beginner’s Guide to Cyclic Voltammetry
https://www.origalys.com/Files/120087/TP-2-Systeme-Ferri-Ferro-Cyanure.pdf
Kafia OULMI
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