Synergistic redox reactions toward co‐production of H<sub>2</sub>O<sub>2</sub> and value‐added chemicals: Dual‐functional photocatalysis to achieving sustainability
Brenden Jing Su, Joel Jie Foo, Grayson Zhi Sheng Ling, Wee‐Jun Ong
Abstract
Abstract Integrating H 2 O 2 evolution with oxidative organic synthesis in a semiconductor‐driven photoredox reaction is highly attractive since H 2 O 2 and high‐value chemicals can be concurrently produced using solar light as the only energy input. The dual‐functional photocatalytic approach, free from sacrificial agents, enables simultaneous production of H 2 O 2 and high‐value organic chemicals. This strategy promises a green and sustainable organic synthesis with minimal greenhouse gas emissions. In this review, we first elucidate the fundamental principles of cooperative photoredox integration of H 2 O 2 synthesis and selective organic oxidation with simultaneous utilization of photoexcited electrons and holes over semiconductor‐based photocatalysts. Afterwards, a thorough review on the recent advancements of cooperative photoredox synthesis of H 2 O 2 and value‐added chemicals is presented. Notably, in‐depth discussions and insights into the techniques for unravelling the photoredox reaction mechanisms are elucidated. Finally, critical challenges and prospects in this thriving field are comprehensively discussed. It is envisioned that this review will serve as a pivotal guidance on the rational design of such dual‐functional photocatalytic system, thereby further stimulating the development of economical and environmentally benign H 2 O 2 and high‐value chemicals production.