Recent progress on Bi4O5Br2-based photocatalysts for environmental remediation and energy conversion

Abstract

As a V–VI–VII visible light active compound, Bi₄O₅Br₂ with a unique hierarchical crystal structure can generate an electrostatic field vertically within the crystal, providing tunable properties and a suitable band structure, and has been widely explored in solar energy conversion and environmental purification. However, the narrow band gap of Bi₄O₅Br₂ seriously restricts the improvement of its photocatalytic performance. Great efforts have been made to increase the carrier mobility of Bi₄O₅Br₂. Herein, we present a comprehensive review on the recent progress of Bi₄O₅Br₂-based photocatalysts. First, we briefly introduce the crystal structure and photocatalytic mechanism of Bi₄O₅Br₂. The synthesis processes of Bi₄O₅Br₂-based photocatalysts are also presented, including the hydrothermal/solvothermal method, hydrolysis method, microwave irradiation method, and other synthesis methods. Then, we outline the modification strategies of Bi₄O₅Br₂-based photocatalysts, such as non-metallic and metallic modifications, facet and morphology engineering, vacancy introduction, carbon materials modification, and heterojunction construction. Subsequently, the photocatalytic performance of Bi₄O₅Br₂-based materials and their potential application in contaminant degradation, hydrogen evolution, CO₂ reduction, and N₂ fixation are discussed. Consequently, we propose the challenges and prospects of Bi₄O₅Br₂-based photocatalysts for broad application.