Volume 60, Issue 26 pp. 14329-14333
Communication

High-Rate CO2 Electroreduction to C2+ Products over a Copper-Copper Iodide Catalyst

Hefei Li

Hefei Li

State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 China

University of Chinese Academy of Sciences, Beijing, 100049 China

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Dr. Tianfu Liu

Dr. Tianfu Liu

State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 China

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Pengfei Wei

Pengfei Wei

State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 China

University of Chinese Academy of Sciences, Beijing, 100049 China

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Long Lin

Long Lin

State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 China

University of Chinese Academy of Sciences, Beijing, 100049 China

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Prof. Dr. Dunfeng Gao

Corresponding Author

Prof. Dr. Dunfeng Gao

State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 China

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Prof. Dr. Guoxiong Wang

Corresponding Author

Prof. Dr. Guoxiong Wang

State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 China

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Prof. Dr. Xinhe Bao

Prof. Dr. Xinhe Bao

State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023 China

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First published: 10 April 2021
Citations: 167

Graphical Abstract

A Cu-CuI composite catalyst achieves a remarkable C2+ partial current density of 591 mA cm−2 at −1.0 V vs. RHE, substantially higher than Cu or CuI alone. It is ascribed to the presence of residual Cu+ and adsorbed iodine species which improve CO adsorption and facilitate C−C coupling during CO2 electroreduction.

Abstract

Electrochemical CO2 reduction reaction (CO2RR) to multicarbon hydrocarbon and oxygenate (C2+) products with high energy density and wide availability is of great importance, as it provides a promising way to achieve the renewable energy storage and close the carbon cycle. Herein we design a Cu-CuI composite catalyst with abundant Cu0/Cu+ interfaces by physically mixing Cu nanoparticles and CuI powders. The composite catalyst achieves a remarkable C2+ partial current density of 591 mA cm−2 at −1.0 V vs. reversible hydrogen electrode in a flow cell, substantially higher than Cu (329 mA cm−2) and CuI (96 mA cm−2) counterparts. Induced by alkaline electrolyte and applied potential, the Cu-CuI composite catalyst undergoes significant reconstruction under CO2RR conditions. The high-rate C2+ production over Cu-CuI is ascribed to the presence of residual Cu+ and adsorbed iodine species which improve CO adsorption and facilitate C−C coupling.

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