Multifunctional photoelectrochemical (PEC) systems for coupled water treatment and high-value product generation have received widespread attention because of the high efficiency in solar energy conversion, less secondary pollution, and the benefit from high-value product generation. This paper reviews several kinds of multifunctional PEC processes, namely, water treatment coupled with H₂ or H₂O₂ evolution or CO₂ reduction, integration of water treatment and desalination, and electricity production from water treatment. The review emphasizes the performance of different processes, analyzes their pros and cons, and summarizes the mechanisms. It also figures out the remaining challenges toward the applied photoelectrodes, supporting electrolytes and reactor design, and provides perspectives on photoelectrode and process development.

用于耦合水处理和高价值产品生产的多功能光电化学 (PEC) 系统由于太阳能转换效率高、二次污染少以及可从高价值产品生产中受益而受到广泛关注。本文综述了几种多功能PEC工艺，即结合H ₂或H ₂ O ₂析出或CO _{2 的}水处理。水处理和海水淡化一体化以及水处理发电。审查强调了不同过程的性能，分析了它们的优缺点，并总结了机制。它还指出了应用光电极、支持电解质和反应器设计方面的剩余挑战，并提供了有关光电极和工艺开发的观点。