Chinese Journal of Catalysis ›› 2023, Vol. 45: 152-161.DOI: 10.1016/S1872-2067(22)64188-3

• Article • Previous Articles     Next Articles

Atomically dispersed Ni-N-C catalyst derived from NiZn layered double hydroxides for efficient electrochemical CO2 reduction

Ping Zhanga, Hao Chena,*(), Lin Chena, Ying Xionga, Ziqi Sunb, Haoyu Yangb, Yingke Fua, Yaping Zhanga, Ting Liaoc,*(), Fei Lid,*()   

  1. aState Key Laboratory of Environment-friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, Sichuan, China
    bSchool of Chemistry and Physics, Faculty of Science, Queensland University of Technology, Brisbane, Qld 4000, Australia
    cSchool of Mechanical, Medical and Process Engineering, Faculty of Engineering, Queensland University of Technology, Brisbane, Qld 4000, Australia
    dState Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116024, Liaoning, China
  • Received:2022-07-14 Accepted:2022-10-19 Online:2023-02-18 Published:2023-01-10
  • Contact: Hao Chen, Ting Liao, Fei Li
  • Supported by:
    National Natural Science Foundation of China(U20A20125)

Abstract:

Atomically dispersed catalytic metal sites anchored on N-doped carbon support catalysts (M-N-C) show great prospects for CO2 electroreduction. Here, single-layer NiZn layered double hydroxides (NiZn-LDHs) was used as a sacrificial assistant to fabricate single-Ni atom anchored on ultrathin porous carbon catalyst. NiZn-LDHs were exfoliated to single-layer by polyhydroxy compounds which took as the carbon resource in Ni-N-C, and single layer NiZn LDHs taking as the Ni resource could avoid the agglomeration of Ni atoms during calcining. The CO Faradaic efficiency (FECO) of the synthesized Ni-N-C catalyst exceeded 90% at -0.6 to -1.0 V and a FECO of 95.2% with a current density of 24 mA cm-2 at -0.9 V. This work not only provides a new method for preparing M-N-C catalysts, but also offers an effective and controllable strategy for large-scale production of high-performance single-atom catalysts.

Key words: NiZn-Layered double hydroxides, CO2 reduction, Ni-N-C Catalyst, Active site, Efficient preparation