Chinese Journal of Catalysis ›› 2023, Vol. 48: 185-194.DOI: 10.1016/S1872-2067(23)64415-8

• Articles • Previous Articles     Next Articles

Fe nanoparticles embedded in N-doped porous carbon for enhanced electrocatalytic CO2 reduction and Zn-CO2 battery

Wenqian Yanga,1, Ziqian Xueb,1, Jun Yanga, Jiahui Xiana, Qinglin Liua, Yanan Fana, Kai Zhenga, Peiqin Liaoa, Hui Suc, Qinghua Liuc, Guangqin Lia,*(), Cheng-Yong Sua,*()   

  1. aState Key Laboratory of Optoelectronic Materials and Technologies, MOE Laboratory of Bioinorganic and Synthetic Chemistry, Lehn Institute of Functional Materials, School of Chemistry, Sun Yat-Sen University, Guangzhou 510006, Guangdong, China
    bInstitute for Integrated Cell-Material Sciences, Kyoto University, Institute for Advanced Study, Kyoto University, Yoshida, Ushinomiya-cho, Sakyo-ku, Kyoto 606-8501, Japan
    cNational Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230026, Anhui, China
  • Received:2022-11-29 Accepted:2023-02-01 Online:2023-05-18 Published:2023-04-20
  • Contact: * E-mail: liguangqin@mail.sysu.edu.cn (G. Li), cesscy@mail.sysu.edu.cn (C.-Y. Su).
  • About author:First author contact:

    1Contributed equally to this work.

  • Supported by:
    National Key R&D Program of China(2021YFA1500401);Program for Guangdong Introducing Innovative and Entrepreneurial Teams(2017ZT07C069);Local Innovative and Research Teams Project of Guangdong Peal River Talents Program(2017BT01C161);National Natural Science Foundation of China(22075321);National Natural Science Foundation of China(21821003);National Natural Science Foundation of China(21890380)

Abstract:

The selective electrochemical reduction of CO2 to CO is a promising solution for the design of carbon-neutral, sustainable processes. Achieving a highly selective single reduction product is still challenging because of the energetically favorable competing hydrogen evolution reaction. We report the fabrication of N-doped sponge-like porous graphitic carbon structures embedded with Fe nanoparticles (Fe@NPC) via the pre-modification of a metal-organic framework (IRMOF-3(Zn)) with carboxyferrocene, followed by pyrolysis. The as-prepared Fe@NPC exhibited a 96.4% CO Faradaic efficiency at -0.5 VRHE and good stability. The exceptional CO2 reduction performance is attributed to the unique structure of the composite catalyst, which provides abundant hierarchical pores that increase CO2 adsorption and mass transfer, and active Fe sites that synergistically accelerate the kinetics of CO generation. The in situ attenuated total reflectance-Fourier transform infrared analysis provided proof of the improved ability of Fe@NPC to accumulate the crucial intermediate *COOH compared with other pyrolyzed porous carbons. Fe@NPC was used in a Zn-CO2 battery that delivered a maximum power density of 3.0 mW cm-2, evidencing its potential for application in energy-converting devices.

Key words: Fe nanoparticles, Metal organic frameworks, N-doped porous carbon, CO2 electroreduction, Zn-CO2 battery