Journal
CHEMELECTROCHEM
Volume 4, Issue 3, Pages 481-484Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.201600759
Keywords
cobalt phosphide nanoarray; electrocatalyst; energy efficiency; hydrazine oxidation reaction; hydrogen fuel
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We report the development of a cobalt phosphide nanoarray as an efficient and stable catalyst for the hydrazine oxidation reaction (HzOR) in alkaline media. Its high hydrogen evolution reaction (HER) activity enables it to be used as a bifunctional catalyst for less energy-intensive electrolytic hydrogen generation by replacing the sluggish oxygen evolution reaction with HzOR. The corresponding two-electrode electrolyzer using such a nanoarray as both the anode for HzOR and the cathode for HER only needs a cell voltage of 0.2V to drive 10mAcm(-2) in 1.0M KOH with 100mM hydrazine, which is 1.45V less than that for pure water splitting. This electrolyzer also shows strong long-term electrochemical durability with nearly 100% faradic efficiency for hydrogen evolution.
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