Chinese Journal of Catalysis ›› 2024, Vol. 64: 54-65.DOI: 10.1016/S1872-2067(24)60103-8

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Chalcogen heteroatoms doped nickel-nitrogen-carbon single-atom catalysts with asymmetric coordination for efficient electrochemical CO2 reduction

Jialin Wanga, Kaini Zhanga, Ta Thi Thuy Ngab, Yiqing Wanga, Yuchuan Shia, Daixing Weia, Chung-Li Dongb, Shaohua Shena,*()   

  1. aInternational Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China
    bDepartment of Physics, Tamkang University, New Taipei City 25137, Taiwan, China
  • Received:2024-05-14 Accepted:2024-06-29 Online:2024-09-18 Published:2024-09-19
  • Contact: * E-mail: shshen_xjtu@mail.xjtu.edu.cn (S. Shen).
  • Supported by:
    National Natural Science Foundation of China(52225606);National Natural Science Foundation of China(52488201)

Abstract:

The electronic configuration of central metal atoms in single-atom catalysts (SACs) is pivotal in electrochemical CO2 reduction reaction (eCO2RR). Herein, chalcogen heteroatoms (e.g., S, Se, and Te) were incorporated into the symmetric nickel-nitrogen-carbon (Ni-N4-C) configuration to obtain Ni-X-N3-C (X: S, Se, and Te) SACs with asymmetric coordination presented for central Ni atoms. Among these obtained Ni-X-N3-C (X: S, Se, and Te) SACs, Ni-Se-N3-C exhibited superior eCO2RR activity, with CO selectivity reaching ~98% at -0.70 V versus reversible hydrogen electrode (RHE). The Zn-CO2 battery integrated with Ni-Se-N3-C as cathode and Zn foil as anode achieved a peak power density of 1.82 mW cm-2 and maintained remarkable rechargeable stability over 20 h. In-situ spectral investigations and theoretical calculations demonstrated that the chalcogen heteroatoms doped into the Ni-N4-C configuration would break coordination symmetry and trigger charge redistribution, and then regulate the intermediate behaviors and thermodynamic reaction pathways for eCO2RR. Especially, for Ni-Se-N3-C, the introduced Se atoms could significantly raise the d-band center of central Ni atoms and thus remarkably lower the energy barrier for the rate-determining step of *COOH formation, contributing to the promising eCO2RR performance for high selectivity CO production by competing with hydrogen evolution reaction.

Key words: Electrochemical CO2 reduction reaction, Chalcogen heteroatoms, Single-atom catalysts, Asymmetric coordination, CO production