HER and OER are two completely different reactions and are catalyzed by different materials.

"However, it is true if we work on hydrogen evolution both type of materials will work." Continue to waste your time . Good luck

Dear Ashish Gupta

Funny reply from Yurii V Geletii ("Continue to waste your time")!! But he is correct.

Some researcher, they developed bi-functional catalyst which can work both HER and OER. But in commercial way in general Platinum based catalyst are used for HER and metal oxides (IrO2, RuO2, etc) are used in OER.

Best Regards,

Bapi

Hello Ashish,

thank you for posting this very interesting technical question on RG. As mentionend by Yurii, HER and OER are two completely different reactions. Together with the oxygen reduction reaction (ORR) these reactions are essential not only for water splitting but also for fuel cells and metal–air batteries. Last year researchers reported the surprising finding that certain bifunctional catalysts can catalyze both the HER and OER reactions. For more information about this finding please have a look at the following very interesting article:

Bifunctional HER/OER or OER/ORR Catalytic Activity of Two-Dimensional TM3(HITP)2 with TM = Fe–Zn

Article Bifunctional HER/OER or OER/ORR Catalytic Activity of Two-Di...

Unfortunately this paper has not yet been posted as public full text on RG. However, three of the authors have RG profiles. Thus chances are that you can request the full text e.g. from the corresponding author via RG.

Good luck with your work and best wishes, Frank Edelmann

Thank you Prof. @Yurii V Geletii

What I mean to say is that in case one electrode(working) is showing OER, will another (counter) shows HER reaction? and vice versa

if not what will be the reaction on counter electrode

You will have a huge overpotential on counter electrode resulting in either H2-evolution or corrosion of the electrode