Affiliation:
1. College of Materials Science and Engineering State Key Laboratory of New Textile Materials & Advanced Processing Technology Wuhan Textile University Wuhan 430200 P. R. China
2. Sustainable Energy Laboratory Faculty of Materials Science and Chemistry China University of Geosciences Wuhan 388 Lumo RD Wuhan 430074 P. R. China
Abstract
AbstractWater splitting, an efficient technology to produce purified hydrogen, normally requires high cell voltage (>1.5 V), which restricts the application of single atoms electrocatalyst in water oxidation due to the inferior stability, especially in acidic environment. Substitution of anodic oxygen evolution reaction (OER) with hydrazine oxidation reaction (HzOR) effectually reduces the overall voltage. In this work, the utilization of iridium single atom (Ir‐SA/NC) as robust hydrogen evolution reaction (HER) and HzOR electrocatalyst in 0.5 m H2SO4 electrolyte is reported. Mass activity of Ir‐SA/NC is as high as 37.02 A mgIr−1 at overpotential of 50 mV in HER catalysis, boosted by 127‐time than Pt/C. Besides, Ir‐SA/NC requires only 0.39 V versus RHE to attain 10 mA cm−2 in HzOR catalysis, dramatically lower than OER (1.5 V versus RHE); importantly, a superior stability is achieved in HzOR. Moreover, the mass activity at 0.5 V versus RHE is enhanced by 83‐fold than Pt/C. The in situ Raman spectroscopy investigation suggests the HzOR pathway follows *N2H4→*2NH2→*2NH→2N→*N2→N2 for Ir‐SA/NC. The hydrazine assisted water splitting demands only 0.39 V to drive, 1.25 V lower than acidic water splitting.
Funder
National Natural Science Foundation of China
Subject
General Physics and Astronomy,General Engineering,Biochemistry, Genetics and Molecular Biology (miscellaneous),General Materials Science,General Chemical Engineering,Medicine (miscellaneous)
Cited by
7 articles.
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