Dynamic dissolution and re-adsorption of molybdate ion in iron incorporated nickel-molybdenum oxyhydroxide for promoting oxygen evolution reaction

Liao, Hanxiao ¹Zhang, Xiaodong ¹Niu, Shuwen ²Tan, Pengfei ¹Chen, Kejun ¹Liu, Yong ¹Wang, Gongming ²Liu, Min ¹Pan, Jun¹

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作者信息

1. Cent South Univ
2. Univ Sci & Technol China
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Abstract

Transition metal-based pre-catalysts undergo drastic reconstruction to form the active catalysts during the alkaline oxygen evolution reaction (OER). However, the effect of escaped inactive ion from pre-catalysts themselves is usually ignored during reconstruction processes. Here, we investigate the effect of inactive MoO(4)(2-& nbsp;)escaped from a pre-catalyst of Fe incorporated nickel-molybdenum oxyhydroxide (NiMo-Fe) on OER performance. The results of in-situ Raman and X-ray photoelectron spectroscopy reveal that MoO(4)(2-& nbsp;)can be easily dissolved into KOH electrolyte and re-adsorbed on surface of catalyst during OER processes, which delivers a promoting effect on OER performance. The dissolution of MoO(4)(2-& nbsp;)is beneficial for increasing the reconstruction degree of NiMo-Fe to form the active phase of NiFeOOH. Theoretical calculations demonstrate that the re adsorbed MoO(4)(2-& nbsp;)is favorable for the adsorption of the OOH* intermediate, thus boosts the OER activity. As expected, the NiMo-Fe shows a superior electrocatalytic performance for OER, outperforming the pre-catalyst without Mo species. This finding enriches the knowledge of inactive-ion effect on alkaline OER performance and offers a path for developing efficient electrocatalysts.

Key words

Dynamic behavior/Ion effect/Promoting effect/Molybdate ion/Oxygen evolution reaction/HIGHLY-EFFICIENT/IN-SITU/SELF-RECONSTRUCTION/ACTIVE-SITES/WATER/ELECTROCATALYSTS/NANOSHEETS/OXIDE/FILM/REDUCTION

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出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量70

参考文献量75

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