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Activating Single‐Atom Ni Site via First‐Shell Si Modulation Boosts Oxygen Reduction Reaction

Journal Article · · Small
 [1];  [1];  [2];  [1];  [1];  [3];  [1];  [1];  [1];  [2]
  1. Key Laboratory of Special Functional Materials for Ecological Environment and Information Ministry of Education School of Material Science and Engineering Hebei University of Technology Tianjin 300130 P. R. China
  2. Department of Physics and Astronomy University of California Irvine CA 92697 USA
  3. School of Materials Science and Engineering Tianjin University Tianjin Haihe Education Park Tianjin 300072 P. R. China
Abstract

Atomically dispersed nitrogen‐coordinated 3d transition‐metal site on carbon support (M‐NC) are promising alternatives to Pt group metal‐based catalysts toward oxygen reduction reaction (ORR). However, despite the excellent activities of most of M‐NC catalysts, such as Fe‐NC, Co‐NC et al., their durability is far from satisfactory due to Fenton reaction. Herein, this work reports a novel Si‐doped Ni‐NC catalyst (Ni‐SiNC) that possesses high activity and excellent stability. X‐ray absorption fine structure and aberration‐corrected transmission electron microscopy uncover that the single‐atom Ni site is coordinated with one Si atom and three N atoms, constructing Ni‐Si1N3 moiety. The Ni‐SiNC catalyst exhibits a half‐wave potential (E1/2) of 0.866 V versus RHE, with a distinguished long‐term durability in alkaline media of only 10 mV negative shift in E1/2 after 35 000 cycles, which is also validated in Zn‐air battery. Density functional theory calculations reveal that the Ni‐Si1N3 moiety facilitates ORR kinetics through optimizing the adsorption of intermediates.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States). National Synchrotron Light Source II (NSLS-II)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
SC0012704
OSTI ID:
2425448
Journal Information:
Small, Journal Name: Small Journal Issue: 8 Vol. 19; ISSN 1613-6810
Publisher:
Wiley
Country of Publication:
United States
Language:
English

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