J. Mater. Sci. Technol. ›› 2025, Vol. 234: 307-318.DOI: 10.1016/j.jmst.2025.01.064

• Research Article • Previous Articles     Next Articles

Vanadium changes the local electron densities of InNNi3-xVx for highly efficient and selective electrocatalytic CO2 reduction to formate

Yiguang Gaia,1, Dong Tiana,1, Zhishan Lia,*, Guanghao Wanga, Wenli Kanga, Hua Wanga,b, Kongzhai Lia,b,*   

  1. aFaculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China;
    bState Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China
  • Received:2024-11-28 Revised:2025-01-10 Accepted:2025-01-26 Published:2025-11-01 Online:2025-04-09
  • Contact: *E-mail addresses: 20200136@kust.edu.cn (Z. Li), kongzhai.li@foxmail.com (K. Li).
  • About author:1These authors contributed equally to this work.

Abstract: Electroreduction of CO2 into beneficial products is integral to attaining carbon neutrality. Herein, we detail a series of anti-perovskite nitrides InNNi3-xVx (x = 0, 0.2, 0.4, 0.6, 0.8) to be highly effective CO2RR. The InNNi2.4V0.6 demonstrated exceptional conversion of CO2 to formate, achieving an optimal Faraday efficiency (FE) of 93.6 % at -0.754 V versus RHE. It also exhibited a partial current density of 200 mA cm-2 at -1.1 V versus RHE, along with remarkable stability in an H-type cell. Electrochemical tests, X-ray absorption fine structure, and theoretical calculations demonstrated that in addition to altering InNNi3 electronic structure, V doping results in lattice distortion in NiN3 octahedron, increasing the lattice spacing of InNNi2.4V0.6 (111) surface, exposing more active sites. This enhances its ability to adsorb the reaction intermediate *OCHO, thereby facilitating the conversion of CO2 into formate. This research offers a viable approach for optimizing an electrocatalyst to convert CO2 to valuable products.

Key words: Electrocatalysis, CO2 reduction, Anti-perovskite, V doped InNNi3