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Incorporation of nickel single atoms into carbon paper as self-standing electrocatalyst for CO2reduction

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The design of selective and efficient catalysts for electrochemical CO2 reduction is highly desirable yet still challenging, in particular, if the aim is to make them binder-free and self-standing. Here, we report a new and straightforward strategy to incorporate Ni single atoms into a commercially available carbon paper to prepare a self-standing electrode. This is accomplished by consecutive acid activation, adsorption of Ni2+ ions, and pyrolysis steps. Structural characterizations and calculations based on density functional theory consistently suggest that the Ni single atoms are coordinated with three N and one S atoms on the carbon paper. When used for CO2 electroreduction, the electrode exhibits an optimal selectivity (91%), activity (3.4 mA cm-2), and stability (at least 14 h) for CO production in water at an overpotential of 660 mV. This report may inspire the design and incorporation of single atoms of various metal types into carbon papers, or other kinds of carbon substrates, for a wide range of electrocatalytic processes. This journal is

OriginalsprogEngelsk
TidsskriftJournal of Materials Chemistry A
Vol/bind9
Nummer3
Sider (fra-til)1583-1592
Antal sider10
ISSN2050-7488
DOI
StatusUdgivet - jan. 2021

Bibliografisk note

Funding Information:
We thank the Danish National Research Foundation (grant no. DNRF118) for generous nancial support. Simin Li (CSC No. 201806370200) and Xiuyuan Lu (CSC No. 201806370221) are nancially supported by a PhD scholarship from China Scholarship Council. We acknowledge Diamond Light Source for beamtime, Giannantonio Cibin for experimental support at B18, and DanScatt for nancial support. We also acknowledge computing time on the facilities of HPC Wales and the Advanced Research Computing @ Cardiff (ARCCA) at Cardiff University. X.-M. Hu acknowledges the support of Qilu Young Scholars program from Shandong University.

Publisher Copyright:
© The Royal Society of Chemistry.

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

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