Chinese Journal of Catalysis ›› 2024, Vol. 65: 153-162.DOI: 10.1016/S1872-2067(24)60111-7

• Article • Previous Articles     Next Articles

Efficient electrocatalytic urea synthesis from CO2 and nitrate over the scale-up produced FeNi alloy-decorated nanoporous carbon

Zuo-Shu Suna,1, Xue-Yan Xianga,1, Qiu-Ping Zhaoa, Zhao Tanga, Shi-Yi Jianga, Tong-Bu Lua, Zhi-Ming Zhanga, Baifan Wangb,*(), Hua-Qing Yina,*()   

  1. aInstitute for New Energy Materials and Low Carbon Technologies, School of Materials Science & Engineering, Tianjin University of Technology, Tianjin 300384, China
    bState Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
  • Received:2024-05-27 Accepted:2024-07-31 Online:2024-10-18 Published:2024-10-15
  • Contact: *E-mail: hqyin@email.tjut.edu.cn (H.-Q. Yin), baifan_wang@outlook.com (B. Wang).
  • About author:1 These authors contributed equally to this work.
  • Supported by:
    National Natural Science Foundation of China(22104110);National Natural Science Foundation of China(22071180);National Natural Science Foundation of China(92161103);Natural Science Foundation of Tianjin City of China(18JCJQJC47700)

Abstract:

Electrocatalytic urea synthesis provides a favorable strategy for conventional energy-consuming urea synthesis, but achieving large-scale catalyst synthesis with high catalytic efficiency remains challenging. Herein, we developed a simple method for the preparation of a series of FeNi-alloy-based catalysts, named FeNi@nC-T (n represents the content of nanoporous carbon as 1, 3, 5, 7 or 9 g and T = 900, 950, 1000 or 1100 °C), for highly performed urea synthesis via NO3- and CO2 co-reduction. The FeNi@7C-1000 achieved a high urea yield of 1041.33 mmol h-1 gFeNi-1 with a Faradaic efficiency of 15.56% at -1.2 V vs. RHE. Moreover, the scale-up synthesized FeNi@7C-950-S (over 140 g per batch) was achieved with its high catalytic performance and high stability maintained. Mechanism investigation illuminated that the Ni and Fe sites catalyze and stabilize the key *CO and *N intermediates and minimize the C-N coupling reaction barriers for highly efficient urea synthesis.

Key words: Urea synthesis, Electrocatalysis, FeNi alloy, Scale-up synthesis, C-N coupling