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Efficient NiFe-based oxygen evolution electrocatalysts and origin of their distinct activity

Efficient oxygen evolution reaction (OER) electrocatalyst is essential for water electrolysis. Herein, high-performance NiFe-based layered double hydroxides (LDH), phosphide and sulfide OER pre-catalysts were fabricated and their distinct activity was unveiled. The as-prepared NixFe1−xS exhibits ult...

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Published in:Applied catalysis. B, Environmental Environmental, 2022-05, Vol.304, p.120937, Article 120937
Main Authors: Han, Qinglin, Luo, Yuhong, Li, Jingde, Du, Xiaohang, Sun, Shujuan, Wang, Yanji, Liu, Guihua, Chen, Zhongwei
Format: Article
Language:English
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Summary:Efficient oxygen evolution reaction (OER) electrocatalyst is essential for water electrolysis. Herein, high-performance NiFe-based layered double hydroxides (LDH), phosphide and sulfide OER pre-catalysts were fabricated and their distinct activity was unveiled. The as-prepared NixFe1−xS exhibits ultralow OER overpotential of 122 mV at 10 mA cm−2 in 1 M KOH. The alkali-electrolyzer using NixFe1−xS electrodes achieve superior performance exhibiting a voltage of 1.46 V at 10 mA cm−2. Experimental analysis reveals that, during OER, Fe dissolution into electrolyte occurs for NiFe LDH and NixFe1−xP, which were both converted into NiOOH, well explaining their similar activity. Interestingly, Fe dissolution is significantly mitigated in NixFe1−xS, forming partially oxidized Fe2O3/FeOOH species. Theoretical calculations confirmed that Fe2O3/FeOOH is responsible for the enhanced OER energetics of NixFe1−xS. These observations provide new insights on the distinct activity of NiFe-based electrocatalysts, guiding their rational design as well. [Display omitted] •Efficient NixFe1−xS, NixFe1−xP and NiFe LDH eletrocatalysts were fabricated for OER.•New insights on the distinct OER activity of these electrocatalysts was presented.•Fe dissolution occur for NiFe LDH and NixFe1−xP in-situ forming NiOOH catalytic phase.•Fe dissolution is mitigated in NixFe1−xS generating highly active Fe2O3/FeOOH species.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2021.120937