Efficient Oxygen Evolution on Spray Pyrolytically Synthesized Ni, Co and Mixed Ni-Co Oxides on FTO Coated Glass Substrate during Water Electrolysis

The Ni-oxide, Co-oxide and the mixed Ni-Co oxide anodes were synthesized from their respective salt solutions using the spray pyrolysis method for efficient oxygen evolution reaction (OER) during water electrolysis. The mixed Ni-Co-oxides were found more electrocatalytic compared to their respective...

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Bibliographic Details
Published in:ECS transactions 2013-04, Vol.45 (21), p.69-76
Main Authors: Frites, Mourad, Khan, Shahed U.M.
Format: Article
Language:English
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Summary:The Ni-oxide, Co-oxide and the mixed Ni-Co oxide anodes were synthesized from their respective salt solutions using the spray pyrolysis method for efficient oxygen evolution reaction (OER) during water electrolysis. The mixed Ni-Co-oxides were found more electrocatalytic compared to their respective oxides and showed lowest Tafel slope of 160 mV/decade compared to 305 mV/decade and 233 mV/decade for Ni-oxide and Co-oxide respectively. At measured applied potential of 1.00 V/SCE the mixed Ni-Co oxide anode generated a current density of 145.0 mA cm-2 compared to 30.0 mA cm-2 for OER at their individual oxide surfaces. These current densities corresponded to O2 evolution rates of 1.35 mMol cm-2 h-1 at Ni-Co oxide anode and 0.28 mMol O2 cm-2 h-1 at both Ni-oxide and Co-oxide anodes. These results indicate over four-fold increase in OER rate at the mixed Ni-Co oxide anode due to synergetic effect of both oxides compared to their individual oxide surfaces.
ISSN:1938-5862
1938-6737
DOI:10.1149/04521.0069ecst