Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 9, Issue 32, Pages 26867-26873Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.7b07088
Keywords
surface hydrophilicity; surface adsorption; 3d electron structure; proton electron transfer; electrochemical water oxidation
Funding
- National Natural Science Foundation of China [21533007, 11621063, U1532265, 21603207, 11435012, 11305174, 11422547]
- Fundamental Research Funds for the Central Universities [WK2310000054]
- China Postdoctoral Science Foundation [2016M590581]
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Developing efficient and durable oxygen evolution electrocatalyst is of paramount importance for the large-scale supply of renewable energy sources. Herein, we report the design of significant surface hydrophilicity based on cobalt oxyhydroxide (CoOOH) nanosheets to greatly improve the surface hydroxyl species adsorption and reaction kinetics at the Helmholtz double layer for high-efficiency water oxidation activity: The as-designed CoOOH-graphene nanosheets achieve a small surface water contact angle of similar to 23 degrees and a large double-layer capacitance (C-dl) of 8.44 mF/cm(2) and thus could evidently strengthen surface species adsorption and trigger electrochemical oxygen evolution reaction (OER) under a quite low onset potential of 200 mV with an excellent Tafel slope of 32 mV/ dec. X-ray absorption spectroscopy and first-principles calculations demonstrate that the strong interface electron coupling between CoOOH and graphene extracts partial electrons from the active sties and increases the electron state density around the Fermi level and effectively promotes the surface intermediates formation for efficient OER.
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