Acta Chimica Sinica ›› 2022, Vol. 80 ›› Issue (4): 503-509.DOI: 10.6023/A21120562 Previous Articles     Next Articles



应霞薇a, 浮建军a, 曾敏b, 刘文a, 张天宇a, 沈培康a,*(), 张信义b,*()   

  1. a 广西大学化学化工学院 可再生能源材料协同创新中心 南宁 530000
    b 湖北大学物理与电子科学学院 武汉 430062
  • 投稿日期:2021-12-15 发布日期:2022-04-28
  • 通讯作者: 沈培康, 张信义
  • 基金资助:

BiOCl-Fe2O3@TiO2 Mesoporous Composite for Photoelectrochemical Synthesis of Ammonia

Xiawei Yinga, Jianjun Fua, Min Zengb, Wen Liua, Tianyu Zhanga, Peikang Shena(), Xinyi Zhangb()   

  1. a College of Chemistry and Chemical Engineering, Collaborative Innovation Center of Sustainable Energy Materials, Guangxi University, Nanning 530000, China
    b School of Physics and Electronic Science, Hubei University, Wuhan 430062, China
  • Received:2021-12-15 Published:2022-04-28
  • Contact: Peikang Shen, Xinyi Zhang
  • Supported by:
    National Natural Science Foundation of China(21972027)

Nitrogen reduction reaction is an indispensable part of chemical production, and traditional Haber-Bosch process has the problems of high energy consumption and serious CO2 emission. Solar-driven photoelectrochemical synthesis of ammonia has received much attention because it can be carried out under mild conditions. However, the yield of ammonia and conversion efficiency are too low to be practical due to the high dissociation energy of the triply bonded nitrogen molecule. The development of non-precious metal oxide catalysts for ammonia synthesis has the advantages of low commercial cost, high selectivity, and strong operability, which may provide the possibility for commercialization in green ammonia synthesis. In this work, we reported the synthesis of BiOCl-Fe2O3@TiO2 mesoporous composite through a sol-gel method followed by in-situ decomposition approach. The obtained composites were systematically characterized and utilized for photoelectrochemical synthesis of ammonia. The results show that Fe2O3 is strongly coupled with TiO2 to produce a metal oxide-semiconductor heterojunction, while BiOCl nanoparticles are uniformly distributed on the surfaces. Compared to pure TiO2, the band gap of composite becomes remarkably narrowed. As a result, the visible light absorption is enhanced and the utilization of photogenerated carriers is increased. In addition, BiOCl-Fe2O3@TiO2 composite has plenty of Ti3+ for improving the photoelectric migration efficiency. With the presence of BiOCl, the yield of ammonia is significantly increased. Compared with pure TiO2, the ammonia yield of BiOCl-Fe2O3@TiO2 is increased by 7 times, and its ammonia production rate remains stable over 10 h test. Our work offers a new route for photoelectrocatalytic synthesis of green ammonia.

Key words: ammonia synthesis, photoelectrocatalyst, non-noble metal, valence band regulation, photogenerated carrier