Electrochemically activated NiSe-NixSy hybrid nanorods as efficient electrocatalysts for oxygen evolution reaction

By Li, Xiao; Yan, Kai-Li; Rao, Yi; Dong, Bin; Shang, Xiao; Han, Guan-Qun; Chi, Jing-Qi; Hu, Wen-Hui; Liu, Yan-Ru; Chai, Yong-Ming; Liu, Chen-Guang
Published in Electrochimica Acta NULL 2016

Abstract

Abstract Novel activated NiSe-NixSy hybrid nanorods have been fabricated by a facile electrochemical pre-activation process in alkaline solution as efficient electrocatalyts for oxygen evolution reaction (OER). The electrochemical pre-activation process facilitates the growth of an amorphous Ni(OH)2 layer on the surface of NiSe-NixSy hybrid nanorods, and Ni(OH)2 can be easily transferred into NiOOH in alkaline solution as actually active sites for OER. The chemical composition, oxidation state, hybrid structure and surface morphology of NiSe/NF, NiSe-NixSy/NF and activated NiSe-NixSy/NF have been characterized and confirmed by XRD, XPS, SEM, {EDX} and {EDX} mapping. Electrochemical measurements have revealed enhanced {OER} performances of activated NiSe-NixSy/NF including smaller overpotential, Tafel plot and charge-transfer resistance than NiSe/NF and NiSe-NixSy/NF. The superior {OER} performances of activated NiSe-NixSy electrocatalysts may be not only due to the hybrid nanorods but also ascribed to Ni(OH)2 layer on the nanorods derived from electrochemical pre-activation process. Therefore, the method of combining an electrochemical pre-activation process with novel hybrid nanostructures may be a feasible strategy for preparing excellent {OER} eletrocatalysts.

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