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Magnetic‐Field‐Stimulated Efficient Photocatalytic N 2 Fixation over Defective BaTiO 3 Perovskites
Author(s) -
Zhao Zhao,
Wang Dandan,
Gao Rui,
Wen Guobin,
Feng Ming,
Song Guangxin,
Zhu Jianbing,
Luo Dan,
Tan Huaqiao,
Ge Xin,
Zhang Wei,
Zhang Yujun,
Zheng Lirong,
Li Haibo,
Chen Zhongwei
Publication year - 2021
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.202100726
Subject(s) - photocatalysis , perovskite (structure) , density functional theory , charge carrier , photochemistry , materials science , adsorption , oxygen , chemistry , chemical physics , catalysis , optoelectronics , computational chemistry , crystallography , biochemistry , organic chemistry
Efficient coupling solar energy conversion and N 2 fixation by photocatalysis has been shown promising potentials. However, the unsatisfied yield rate of NH 3 curbs its forward application. Defective typical perovskite, BaTiO 3 , shows remarkable activity under an applied magnetic field for photocatalytic N 2 fixation with an NH 3 yield rate exceeding 1.93 mg L −1 h −1 . Through steered surface spin states and oxygen vacancies, the electromagnetic synergistic effect between the internal electric field and an external magnetic field is stimulated. X‐ray absorption spectroscopy and density functional theory calculations reveal the regulation of electronic and magnetic properties through manipulation of oxygen vacancies and inducement of Lorentz force and spin selectivity effect. The electromagnetic effect suppresses the recombination of photoexcited carriers in semiconducting nanomaterials, which acts synergistically to promote N 2 adsorption and activation while facilitating fast charge separation under UV‐vis irradiation.