Effect of Fe dopant on oxygen vacancy variation and enhanced photocatalysis hydrogen production of LaMnO3 perovskite nanofibers

• Published in: Materials science in semiconductor processing Vol. 166; p. 107697
• Main Authors: Zhan, Meiling, Fang, Minghao, Li, Liangyu, Zhao, Yajing, Yang, Bozhi, Min, Xin, Du, Pengpeng, Liu, Yan'gai, Wu, Xiaowen, Huang, Zhaohui
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.11.2023
• Subjects: Electrospinning; Nanofiber; Perovskites; Photocatalysis hydrogen production; Electrospinning; Nanofiber; Perovskites; Photocatalysis hydrogen production
• ISSN: 1369-8001; 1873-4081
• DOI: 10.1016/j.mssp.2023.107697

In the pursuit of enhancing the property of photocatalytic hydrogen production, strategies for enhancing light absorption and the separation and transport efficiency of photo-induced carriers have been studied. Perovskite photocatalyst has great application potential in the field of photocatalytic hydrogen production due to its special crystal structure. LaMn(1-x)FexO3 (x = 0–0.08) perovskite nanofibers with diameters of 50–200 nm were synthesized by electrospinning, and their photochemical properties were investigated. The results of UV–Vis diffuse reflectance spectroscopy, PL spectroscopy, I-t, and EIS revealed that the doping with Fe could improve light absorption and reduce the recombination rate of photogenerated electron-hole pairs, and improve the separation and transfer efficiency of photogenerated electron-hole pairs, likely due to the increased concentration of oxygen vacancies caused by doping. Through optimization of the Fe doping amount, an improved hydrogen production efficiency of 767.71 μmol h−1 g−1 was achieved for LaMn0·96Fe0·04O3, which is 2.5 times the efficiency of undoped LaMnO3 (300.74 μmol h−1 g−1). These results provide a new idea for the development of efficient photocatalysts for hydrogen production. •LaMnO3 nanofibers with various Fe-doping ratios were prepared by electrospinning.•Fe doping can adjust the crystal structure; change the oxygen vacancy concentration.•The prepared LaMn(1-x)FexO3 nanofibers exhibited good photocatalytic activity.