Hi,
I am testing Sigracet carbon paper for a vanadium redox flow battery. I am performing cyclic voltammetry (CV) on heat-treated Sigracet carbon paper. CV shows a clear peak in catholyte (V4+/V5+), but using the same working electrode for V2+/V3+ does not show any activity.
Other literature show clear peaks on V2+/V3+ redox reaction. Any idea?
Literature that show clear peaks: Article Degradation of Carbon Electrodes in the All‐Vanadium Redox F...
anolyte: 0.5M V3+, 2M H2SO4, 30 ml
catholyte: 0.5M V4+, 2M H2SO4, 30 ml
ref electrode: Ag/AgCl
counter electrode: Pt wire or Pt mesh
working electrode: 5cm2 heat-treated Sigracet carbon paper at 500 celcius for 3hr in air atmosphere.
scan rate: 10 mV/s
You are reducing protons before you get to the V2/3 couple. Every material is different for proton reduction. That's why the voltage takes off So that carbon electrode with that high concentration of sulfuric acid makes H2 at that potential. Can you do it in less acidic conditions?
-Kyle
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