What should be the property of an electrode to use as cathode or counter electrode
Hi, Muzaffar Ahmad,
There are several reasons which define a possibility of using material as a counter electrode for experimental cells:
1. It should be inert in a medias you use (also in moments when a cell does not work)
2. If is it possible, surface of it should be larger as possible
3. If you have anodic periods of work, it should be undissolved in experimental solution.
Dear Muzaffar
Auxiliary electrodes are often fabricated from electrochemically inert materials such as gold, platinum, or carbon.The auxiliary electrode may be isolated from the working electrode using a glass frit. Such isolation prevents any byproducts generated at the auxiliary electrode from contaminating the main test solution: for example, if a reduction is being performed at the working electrode in aqueous solution, oxygen may be evolved from the auxiliary electrode. Such isolation is crucial during the bulk electrolysis of a species which exhibits reversible redox behavior.Good luck
Thanks Valerii Kotok sir
Silver foil as well is inert and cheap (comparatively). Can we use it .
Also carbon rod and graphite rod as counter electrode have also been reported .
Also sir can we use the carbon rod of dry cell for the same however contimination might be the issue there.
Thanks Hamed Tavakkoli sir for your response
Sir but we have to look for an alternative counter electrode other than platinum as the process of anodisation is a smart way to fabricate the samples particularly for solar energy conversion . So in order to make it more productive we have to replace the platinum foil .
Please sir suggest
Carbon based electrodes are inexpensive and may be suitable.good luck
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