Hi I read most of the review paper (Include your one) as well as articles, the OER related to RRDE technique to quantify the O2. The Gas chromotography and water displacement method is to quantify the Faradic efficieny of HER. I dont know, exactly RRDE technique is relavant to HER for underatnding mechanism and Faradic efficieny. I hope the RRDE technique or instuemnt developed based groups paper will provide much more detais. Could you share with me your contat number or gmail. My gmail is account is [email protected].

Yeah, Thanks Shanmugam bro. My mail id is [email protected] and I have inboxed you my mob number.

I am aware about the things you said. I am now interrogating the possibilities of employing RRDE method for HER Faradaic efficiency too.

Possible difficulties could be simultaneous O2 reduction at the potential of HOR.

This could happen, if the solution is saturated with inert gas or the counter electrode compartment is not separated from the working electrode compartment.

Moreover, the number electron transfer will be half of that of ORR and OER for HOR and HER. This may cause some troubles in calculations though not to an unacceptable level.

Prior to RRDE experiment, I think it is important to interrogate the HOR performance of the Pt ring in H2 saturated solution in addition to the collection efficiency determination. So that it would be easy to get a comparative overview on the possibilities of applying RRDE method for Faradaic efficiency determination in HER too.

Share your thoughts on this bro which could be valuable for me.

Thanks for the interaction.

Thank you Anand

Hi Anatharaj

I think the idea of faradaic efficiency is may not correct in these cases. It may give some number may be not representing the reality.

Let me explane

I believe that we may calculate the faradaic efficiency from i vs t curves at particular potential. whatever the current we get is resultant of the electrochemical reactions at the electrode and we are not sure how much current should pass at that particular potential for HER or OER (theoretically).

We also don't know what are all the parasitic reaction at the electrode. As Shanmughasundaram Duraisamy said we must measure the quantity of the product that we are looking for and compare with current, that may give a meaningful number.

RDE is technique used to avoid the difficulties in the stationary electrode such as diffusion control, facilitate to calculate some of the kinetic parameters. using RRDE or stationary electrode may not change situation except having one more electrochemical reaction.