Methanol‐Facilitated Surface Reconstruction Catalysts for Near 200% Faradaic Efficiency in a Coupled System

Author:

Xia Qing12,Jin Chengkai3,Huang Yu Lun4,Zhai Yanjie12,Han Wenkai1,Wu Jie12,Xia Chuan5,Lin Chun Che46ORCID,Zhao Xunhua3,Zhang Xiao127ORCID

Affiliation:

1. Department of Mechanical Engineering Research Institute for Advanced Manufacturing The Hong Kong Polytechnic University Kowloon Hung Hom 999077 Hong Kong

2. Research Institute for Smart Energy The Hong Kong Polytechnic University Kowloon Hung Hom 999077 Hong Kong

3. Key Laboratory of Quantum Materials and Devices of Ministry of Education School of Physics Southeast University Nanjing 211189 China

4. Institute of Organic and Polymeric Materials National Taipei University of Technology Taipei 106 Taiwan

5. School of Materials and Energy University of Electronic Science and Technology of China Chengdu Sichuan 610000 P. R. China

6. Research and Development Center for Smart Textile Technology National Taipei University of Technology Taipei 106 Taiwan

7. Shenzhen Research Institute The Hong Kong Polytechnic University Shenzhen 518057 China

Abstract

AbstractThe coupling of the carbon dioxide reduction reaction (CO2RR) and methanol oxidation reaction (MOR) holds great promise for the energy‐efficient production of HCOO. However, anode catalysts' limited selectivity (<80%) and stability (<15 h) have impeded electron utilization and HCOO production rates. To overcome it, copper‐copper(I) oxide‐copper(II) oxide nanowires (Cu─CuO─Cu2O NWs) catalysts have been developed, which exhibit exceptional performance in promoting the MOR with a faradic efficiency of nearly 100% at commercially viable current densities, and  long stability over 100 h at 100 mA cm−2. Interestingly, the unique structure of the catalysts, when exposed to methanol, facilitates a transition from Cu/CuO to Cu2O. This phenomenon promotes the MOR while inhibiting the competitive oxygen evolution reaction (OER). By coupling the anodic reaction with cathodic CO2 reduction, the system demonstrates exceptional performance in HCOO production, achieving an overall faradic efficiency of nearly 200% at 100 mA cm−2 with a low cell voltage of 2.382 V. Techno‐economic analysis indicates that the production costs of HCOOH are ≈US$0.37 and 0.35 kg−1 at 100 and 150 mA cm−2, respectively, significantly lower than those associated with traditional electrochemical methods.

Funder

Hong Kong Polytechnic University

National Natural Science Foundation of China

Science, Technology and Innovation Commission of Shenzhen Municipality

Publisher

Wiley

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