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

Authors :
Wei Zhou
Thomas R. Gengenbach
Cordelia Selomulya
Dongyuan Zhao
Shenlong Zhao
Huanting Wang
Jing Tang
Sixuan She
Yu Chen
Yang Wang
Tim Williams
Haiyan Mao
Zongping Shao
Feifei Zhang
Lianhai Zu
Yinlong Zhu
Source :
Matter. 3:2124-2137
Publication Year :
2020
Publisher :
Elsevier BV, 2020.

Abstract

Summary 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.

Details

ISSN :
25902385
Volume :
3
Database :
OpenAIRE
Journal :
Matter
Accession number :
edsair.doi...........d972f2682f2ec0381dc4d2ee67633546