期刊
ELECTROCHIMICA ACTA
卷 361, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.137040
关键词
Ni/NiO; Hydrogen evolution; In situ raman; Alkaline electrolysis
资金
- Research Council of Norway [268019, 261620, 245963/F50]
Nickel/Nickel oxide (Ni/NiO) nanosheets heterostructure is a cheap and active catalyst for hydrogen evolution reaction (HER) in alkaline electrolytes. However, the reason for this activity is still under debate. Herein in-situ Raman electrochemistry has been established as a method to probe interfacial intermediates and correlate the performance of various nickel catalysts (Ni, NiO, and Ni/NiO nanosheets) during HER. In-situ Raman spectroscopy demonstrated that Ni/NiO nanosheet heterostructure maintained beta-Ni(OH)(2) species initially, which may contribute to the superior initial HER activity. Ni/NiO nanosheets lost beta-Ni(OH)(2) species by preserving a high cathodic overpotential (-0.4 V vs. RHE) for 2000 sec. The results confirmed the importance of Ni metal sites in addition to NiO sites and maintaining hydroxide species for superior and durable HER activity. These results can be utilized to design an efficient and durable catalyst for alkaline electrolyzers for the sustainable production of hydrogen. (C) 2020 The Author(s). Published by Elsevier Ltd.
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