Why observing a ORR peak at -0.4 V vs Ag/AgCl even in blank GC electrode?

Hello everyone I study the the catalytic activity of non-precious and biomass derived electrocatalysts for ORR. I am observing a ORR peak at -0.4 V vs Ag/AgCl even in blank GC electrode? Peak is...

12 June 2019 155 10 View