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Research Article

Atomically dispersed Co-Cu alloy reconstructed from metal-organic framework to promote electrochemical CO2 methanation

Hao Sun1,2, Ling Lin1,3, Wei Hua1,3, Xulan Xie1,3, Qiaoqiao Mu1,3, Kun Feng4, Jun Zhong4, Fenglei Lyu1,2, Zhao Deng1,3, Yang Peng1,2,5( )
Soochow Institute for Energy and Materials Innovations, College of Energy, Soochow University, Suzhou 215006, China
Jiangsu Key Laboratory of Advanced Negative Carbon Technologies, Soochow University, Suzhou 215006, China
Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China
Institute of Functional Nano & Soft Materials, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow University, Suzhou 215123, China
Soochow Municipal laboratory for low carbon technologies and industries, Soochow University, Suzhou 215006, China
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Graphical Abstract

Atomically dispersed Co-Cu alloy fabricated by in-situ reconstruction of the trace-Co doped Cu metal-organic framework is employed as the catalyst for electrochemical CO2 reduction. The Co dopants in Cu favor *CO protonation vs. C−C coupling through enhanced *H adsorption and reduced *CO coverage, promoting thereby the methane selectivity.

Abstract

Electroreduction of carbon dioxide into value-added fuels or chemicals using renewable energy helps to effectively reduce carbon dioxide emission and alleviate the greenhouse effect while storing intermittent energies. Due to the existing infrastructure of global natural gas utilization and distribution, methane produced in such a green route attracts wide interests. However, limited success has been witnessed in the practical application of catalysts imparting satisfactory methane activity and selectivity. Herein, we report the fabrication of an atomically dispersed Co-Cu alloy through the reconstruction of trace-Co doped Cu metal-organic framework. This catalyst exhibits a methane Faradaic efficiency of 60% ± 1% with the corresponding partial current density of 303 ± 5 mA·cm−2. Operando X-ray adsorption spectroscopy and attenuated-total-reflection surface enhanced infrared spectroscopy unravel that the introduction of atomically dispersed Co in Cu favors *CO protonation via enhancing surface water activation, and suppresses C−C coupling by reducing *CO coverage, thereby leading to high methane selectivity.

Keywords

electrochemical carbon dioxide reductionmetal-organic frameworkmethanealloycatalyst reconstruction

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Nano Research
Volume 16 Issue 3,
March 2023
Pages 3680-3686
DOI: 10.1007/s12274-022-4728-1
Cite this article:
Sun H, Lin L, Hua W, et al. Atomically dispersed Co-Cu alloy reconstructed from metal-organic framework to promote electrochemical CO2 methanation. Nano Research, 2023, 16(3): 3680-3686. https://doi.org/10.1007/s12274-022-4728-1
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Received: 28 May 2022
Revised: 29 June 2022
Accepted: 30 June 2022
Published: 01 August 2022
© Tsinghua University Press 2022
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