Semiconductor photocatalysis is considered as a cutting-edge research topic for the production of value-added fuels and chemicals to confront the global energy crisis. In order to improve the solar-to-chemical conversion efficiency of pristine semiconductors, combining them with cocatalysts to form heterostructures has been extensively investigated. Among studied formulations, bimetallic nanoparticles (NPs), featuring enhanced light harvesting, efficient capture of photogenerated electrons and abundant surface active sites are ideal cocatalysts to improve the photocatalytic performance of semiconductor-based photocatalysts. In this review, we begin with a concise overview of representative synthesis and characterization methods of bimetallic NPs. Then, we predominantly summarize the typical applications of semiconductor/bimetallic NPs-based composites in photoredox catalysis, including hydrogen evolution, carbon dioxide reduction, selective organic synthesis and environmental remediation. In particular, we highlight the regulatory effects of parameters of bimetallic NPs (composition, structure, morphology, size, atomic arrangement, loading position, etc.) on the photocatalytic activity and selectivity. Finally, the remaining challenges and future perspectives for the utilization of bimetallic NPs in photoredox catalysis are discussed and anticipated to stimulate the sparkling ideas in the construction of high-efficiency semiconductor/bimetallic NPs-based photocatalytic systems.

半导体光催化被认为是生产增值燃料和化学品以应对全球能源危机的前沿研究课题。为了提高原始半导体的光化学转化效率，已将它们与助催化剂结合形成异质结构得到了广泛的研究。在研究的配方中，具有增强的光收集，有效捕获光生电子和丰富的表面活性位的双金属纳米粒子（NPs）是理想的助催化剂，可改善基于半导体的光催化剂的光催化性能。在这篇综述中，我们从对双金属NPs的代表性合成和表征方法的简要概述开始。然后，我们主要总结了基于半导体/双金属NPs的复合材料在光氧化还原催化中的典型应用，包括析氢，二氧化碳还原，选择性有机合成和环境修复。特别是，我们重点介绍了双金属NPs的参数（组成，结构，形态，尺寸，原子排列，负载位置等）对光催化活性和选择性的调节作用。最后，讨论并预期了在光氧化还原催化中使用双金属NP的剩余挑战和未来前景，将激发基于高效半导体/双金属NPs的光催化系统构建中的闪耀思想。选择性有机合成和环境修复。特别是，我们重点介绍了双金属NPs的参数（组成，结构，形态，尺寸，原子排列，负载位置等）对光催化活性和选择性的调节作用。最后，讨论并预期了在光氧化还原催化中使用双金属NP的剩余挑战和未来前景，将激发基于高效半导体/双金属NPs的光催化系统构建中的闪耀思想。选择性有机合成和环境修复。特别是，我们重点介绍了双金属NPs的参数（组成，结构，形态，尺寸，原子排列，负载位置等）对光催化活性和选择性的调节作用。最后，讨论并预期了在光氧化还原催化中使用双金属NP的剩余挑战和未来前景，将激发基于高效半导体/双金属NPs的光催化系统构建中的闪耀思想。