Magnetic‐Field‐Stimulated Efficient Photocatalytic N2 Fixation over Defective BaTiO3 Perovskites

Abstract

Efficient coupling solar energy conversion and N2 fixation by photocatalysis has been shown promising potentials. However, the unsatisfied yield rate of NH3 curbs its forward application. Herein, defective typical perovskite, BaTiO3 , shows remarkable activity under an applied magnetic field for photocatalytic N2 fixation with the NH3 yield rate exceeding 1.90mg/L/h. 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 structure (XAS) spectrum and density functional theory (DFT) calculations reveal the regulation of electronic and magnetic properties through manipulations of oxygen vacancies and inducements of Lorentz force and spin selectivity effect. The electromagnetic synergistic effect suppresses the recombination of photoexcited carriers in semiconducting nanomaterials, which acts synergistically to promote N2 adsorption and activation while facilitating fast charge separation under UV-vis irradiation. Therefore, this work offers a promising alternative route for exploring high-photocatalytic-property N2 fixation materials and shed light on stimulating the development of synergistic effect in photocatalysts.