I am trying to get a CV of Hydrogen Peroxide on Prussian Blue which I electrochemically deposited on screen printed carbon electrode.
I am using hydrogen peroxide as the signature molecule to electrochemically detect lactate. I read a few articles which have done this, and they refer to redox peak a 0 V as a signature potential step to do chronoamperometry, but I haven't been seeing this peak.
The best sensor response I get is at a potential step of -0.55V instead of 0V but I don't get any corresponding peak in the CV at this potential.
Hydrogen peroxide reduction on carbon is not kinetically favoured. Oxidation to oxygen is little better and would, if it happens at all on screen-printed carbon, be expected around +0.8 V at least. Catalysts with a Pt group metal, an enzyme or Prussian blue or similar is recommended.
I do have experience of detecting hydrogen peroxide from a lactate oxidase enzyme using prussian blue, if I saw your data I may be able to help - I don't check researchgate a lot you can find me here - https://www.zimmerpeacocktech.com/contact-support/
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