Volume 62, Issue 35 e202304179
Research Article

MXene-Regulated Metal-Oxide Interfaces with Modified Intermediate Configurations Realizing Nearly 100% CO2 Electrocatalytic Conversion

Yanan Hao

Yanan Hao

College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016 China

These authors contributed equally to this work.

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Prof. Feng Hu

Corresponding Author

Prof. Feng Hu

College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016 China

Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin, 300071 China

These authors contributed equally to this work.

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Shangqian Zhu

Shangqian Zhu

Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, 999077 Kowloon, Hong Kong, China

These authors contributed equally to this work.

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Yajie Sun

Yajie Sun

College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016 China

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Hui Wang

Hui Wang

College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016 China

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Luqi Wang

Luqi Wang

College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016 China

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Ying Wang

Ying Wang

College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016 China

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Prof. Jianjun Xue

Prof. Jianjun Xue

College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016 China

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Dr. Yen-Fa Liao

Dr. Yen-Fa Liao

National Synchrotron Radiation Research Center, Hsinchu, 300 Taiwan

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Prof. Minhua Shao

Prof. Minhua Shao

Department of Chemical and Biological Engineering, The Hong Kong University of Science and Technology, 999077 Kowloon, Hong Kong, China

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Prof. Shengjie Peng

Corresponding Author

Prof. Shengjie Peng

College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016 China

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First published: 05 July 2023
Citations: 19

Graphical Abstract

Highly efficient electrocatalytic reduction of CO2 to CO is achieved by Ag nanodomains loaded on ZnO porous nanobelts coupled with high electronic conductivity MXene (Ag−ZnO/Ti3C2Tx). The unique Ti3C2Tx-regulated Ag−ZnO interfaces can modulate the formation and configuration of *CO intermediates (eg. linear- or bridge-bonded CO), which is suitable for highly selective and efficient electrochemical CO2 reduction (eCO2R).

Abstract

Electrocatalytic CO2 reduction via renewable electricity provides a sustainable way to produce valued chemicals, while it suffers from low activity and selectivity. Herein, we constructed a novel catalyst with unique Ti3C2Tx MXene-regulated Ag−ZnO interfaces, undercoordinated surface sites, as well as mesoporous nanostructures. The designed Ag−ZnO/Ti3C2Tx catalyst achieves an outstanding CO2 conversion performance of a nearly 100% CO Faraday efficiency with high partial current density of 22.59 mA cm−2 at −0.87 V versus reversible hydrogen electrode. The electronic donation of Ag and up-shifted d-band center relative to Fermi level within MXene-regulated Ag−ZnO interfaces contributes the high selectivity of CO. The CO2 conversion is highly correlated with the dominated linear-bonded CO intermediate confirmed by in situ infrared spectroscopy. This work enlightens the rational design of unique metal-oxide interfaces with the regulation of MXene for high-performance electrocatalysis beyond CO2 reduction.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

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