Anion Etching for Accessing Rapid and Deep Self-Reconstruction of Precatalysts for Water Oxidation

Yang Wang, Yinlong Zhu, Shenlong Zhao, Sixuan She, Feifei Zhang, Yu Chen, Timothy Williams, Thomas Gengenbach, Lianhai Zu, Haiyan Mao, Wei Zhou, Zongping Shao, Huanting Wang, Jing Tang, Dongyuan Zhao, Cordelia Selomulya

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237 引用 (Scopus)

摘要

Transition metal-based nanomaterials represent an emerging class of highly active and low-cost precatalysts for the oxygen evolution reaction (OER) in alkaline electrolyzers. However, most OER precatalysts undergo slow or incomplete self-reconstructions to generate real active sites, which is a time-consuming process for achieving high OER performance. Thus, we report a new class of OER precatalysts that can achieve highly active OER species by a rapid and deep self-reconstruction (denoted by SELF-RECON). The precatalysts with a core-shell structure comprising NiMoO4 (core) and NiFe/NiFeOx nanoparticles in N-doped amorphous carbons (shell) (denoted by NiMoFeO@NC), can realize rapid MoO42− dissolution and fast formation of NiOOH with Fe incorporation simultaneously. In situ Raman spectroscopy together with electron microscopy, X-ray photoelectron spectroscopy, and electrochemical tests indicate that the obtained NiFeOOH/NiFe-LDH after SELF-RECON behave as the real active species that outperform NiMoFeO@NC, with ultralow overpotentials and extraordinary long-term stability.

源语言英语
页(从-至)2124-2137
页数14
期刊Matter
3
6
DOI
出版状态已出版 - 2 12月 2020

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