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Title: Engineering Active Fe Sites on Nickel–Iron Layered Double Hydroxide through Component Segregation for Oxygen Evolution Reaction

Journal Article · · ChemSusChem
 [1];  [1];  [2];  [1];  [1];  [3];  [4];  [2];  [5]; ORCiD logo [2]
  1. Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Ceramics, State Key Lab. of High Perf. Ceramics and Superfine Microstructure, and Center of Materials Science and Optoelectronics Engineering
  2. Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Ceramics, State Key Lab. of High Perf. Ceramics and Superfine Microstructure
  3. Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Sciences and Engineering Division
  4. Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
  5. Univ. of Queensland, Brisbane, QLD (Australia). Nanomaterials Centre, School of Chemical Engineering and Australian Inst. for Bioengineering and Nanotechnology

Nickel-iron layered double hydroxide (NiFe LDH) is a promising oxygen evolution reaction (OER) electrocatalyst under alkaline conditions. Much research has been performed to understand the structure-activity relationship of NiFe LDH under OER conditions. However, the specific role of the Fe species remains unclear and under debate. Herein, based on DFT calculations, it was discovered that the edge Fe sites show higher activity towards OER than either the edge Ni sites or lattice sites. Therefore, a facile acid-etching method was proposed to controllably induce the formation of edge Fe sites in NiFe LDH, and the obtained sample exhibited higher OER activity. X-ray absorption near edge structure and extended X-ray absorption fine structure analyses further revealed that the interaction of the edge Fe species with Ni is believed to contribute to the enhancement of the OER performance. This work provides a new understanding of the structure-activity relationship in NiFe LDH and offers a facile method for the design of efficient electrocatalysts in an alkaline environment.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1632119
Journal Information:
ChemSusChem, Journal Name: ChemSusChem Journal Issue: 4 Vol. 13; ISSN 1864-5631
Publisher:
ChemPubSoc EuropeCopyright Statement
Country of Publication:
United States
Language:
English

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