Chinese Journal of Applied Chemistry ›› 2024, Vol. 41 ›› Issue (12): 1751-1759.DOI: 10.19894/j.issn.1000-0518.240135

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Electrocatalytic Reduction of CO2 to Widely Proportionally Syngas Enabled by Cu x In y Alloy Synergistic Polyoxometalates

Yue-Hua TAI, Wen-Cong SUN, Lin-Kui HE, Li ZHOU, Shu-Miao LI, Wen-Xue TIAN, Chun-Xiang LI()   

  1. School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,China
  • Received:2024-04-24 Accepted:2024-10-21 Published:2024-12-01 Online:2025-01-02
  • Contact: Chun-Xiang LI
  • About author:lichx@hit.edu.cn
  • Supported by:
    the Education Science Planning Project of Heilongjiang Province(GJB1423127)

Abstract:

Utilizing non grid connected electricity for CO2 conversion and reuse is one of the promising approaches in the context of “dual carbon”. In order to achieve a wide and adjustable proportion of syngas via CO2 reduction, synergistic catalytic system of Cu x In y alloy and PV2MoW9 were designed and constructed. Among alloy series of Cu x In y, Cu1In3 exhibits the optimal CO2 electrocatalytic activity, achieving a high CO Faraday efficiency of 95.3% under an applied voltage of -0.6 V and a stable duration of up to 53 h. Further experimental analysis and theoretical studies indicated that copper-indium alloy weakens the binding between the intermediate *CO and the catalyst, accelerates the process of *CO desorption into CO, and thus improves the selectivity of CO. In this system, the CO2 reduction process is as follows: CO2*CO2-*COOH→ *CO →CO.

Key words: Electrocatalytic CO2 reduction reaction, Copper-indium alloy, Synthetic gas, Polyoxometalates

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