I am working in developing cathode for microbial fuel cell. I made cyclic voltametry using the potentiostate using pt as counter electrode and Ag/AgCl reference electrode. I need to interpret the graphs. Is it good? should I increase the scan rate? how to select the best range of the volt? what is the cause of one peak only?, what is the cause of two peaks? sometimes we have four peaks why?
Dear Dr. Mohamed,
Do your CV measurements carried out for the cathode materials in MFCs ( I mean the complete cell) or just you carried out CV for your cathode materials in three electrode cells in an oxygen saturated electrolyte ( manily Buffer solution ) to check the activity of the cathode materials to catalyze ORR in an environment related to MFCs ?
selecting the suitable potential window for CV depending on different parameters such as the pH of the solution, the reference electrode used and the thermodynamic potential of the reaction under investigation. knowledge the two former factors and their relation to the later factor will help you to specify your working potential window.
here is attached a good presentation about CV and its using to study the different of electrochemical reactions
Also, one book chapter about the CV and related techniques.
Best regards,
Abu Bakr
In addition to the book (Understanding Voltammetry), mentioned by Dr. Punckt, you can also go through the technical note by GAMRY and AUTOLAB.
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