Highly Efficient Electrocatalytic Oxygen Evolution Over Atomically Dispersed Synergistic Ni/Co Dual Sites

Single‐atom catalysts (SACs) are being pursued as economical electrocatalysts. However, their low active‐site loading, poor interactions, and unclear catalytic mechanism call for significant advances. Herein, atomically dispersed Ni/Co dual sites anchored on nitrogen‐doped carbon (a‐NiCo/NC) hollow...

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Published in:Angewandte Chemie International Edition 2022-10, Vol.61 (40), p.e202207537-n/a
Main Authors: Pei, Zhihao, Lu, Xue Feng, Zhang, Huabin, Li, Yunxiang, Luan, Deyan, Lou, Xiong Wen (David)
Format: Article
Language:English
Subjects:
Catalysts
Density functional theory
Dispersion
Dual-Metal Sites
Electrocatalysts
Electrochemistry
Electronic structure
Energy storage
Hollow Prisms
Intermetallic compounds
Optimization
Oxygen
Oxygen Evolution Reaction
Oxygen evolution reactions
Prisms
Single-Atom Catalysts
Synergistic Interactions
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Summary:Single‐atom catalysts (SACs) are being pursued as economical electrocatalysts. However, their low active‐site loading, poor interactions, and unclear catalytic mechanism call for significant advances. Herein, atomically dispersed Ni/Co dual sites anchored on nitrogen‐doped carbon (a‐NiCo/NC) hollow prisms are rationally designed and synthesized. Benefiting from the atomically dispersed dual‐metal sites and their synergistic interactions, the obtained a‐NiCo/NC sample exhibits superior electrocatalytic activity and kinetics towards the oxygen evolution reaction. Moreover, density functional theory calculations indicate that the strong synergistic interactions from heteronuclear paired Ni/Co dual sites lead to the optimization of the electronic structure and the reduced reaction energy barrier. This work provides a promising strategy for the synthesis of high‐efficiency atomically dispersed dual‐site SACs in the field of electrochemical energy storage and conversion. Atomically dispersed Ni/Co dual sites anchored on nitrogen‐doped carbon (a‐NiCo/NC) hollow prisms are synthesized through a templated assisted atom migration‐trapping route. Due to the delicately designed dual‐metal sites and their synergistic interactions, the a‐NiCo/NC electrocatalyst exhibits significantly improved electrocatalytic oxygen evolution performance compared with atomically dispersed single‐metal‐site counterparts.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202207537