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1D/1D Hierarchical Nickel Sulfide/Phosphide Nanostructures for Electrocatalytic Water Oxidation

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journal contribution
posted on 06.08.2018 by Huai Qin Fu, Le Zhang, Chong Wu Wang, Li Rong Zheng, Peng Fei Liu, Hua Gui Yang
The sluggish kinetics of the oxygen evolution reaction (OER) limits the efficiencies of solar-powered electrical-conversion applications, such as water splitting and carbon dioxide reduction. Herein, we rationally designed a metallic nanostructured nickel sulfide/phosphide hybrid (NiSxPy) as an efficient precatalyst for OER, with one-dimensional (1D) nanowires grown on 1D nanorods. The resulting metallic hybrid NiSxPy catalyst can accelerate the electron transfer process and expose abundant in situ-generated NiOOH species during OER (NiSxPy–O). Therefore, NiSxPy–O exhibits a low overpotential of 192 mV (with 100% iR compensation; this value should be 200 mV without compensation) to achieve an O2 partial current density (jO2) of 10 mA cm–2 and a robust stability over 135 h without obvious degradation. Moreover, a jO2 of 10 mA cm–2 at an overpotential of 315 mV (with 100% iR compensation; this value should be 365 mV without compensation) is attained in near-neutral conditions. These results may pave a new way to design metallic precatalysts with 1D/1D hierarchical nanostructures to boost the OER.

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