Decoupling H2 and O2 Release in Particulate Photocatalytic Overall Water Splitting Using a Reversible O2 Binder

Dan Liu, Huihui Xu,Jinni Shen, Xun Wang, Chengwei Qiu,Huaxiang Lin,Jinlin Long,Ying Wang,Wenxin Dai,Yuanxing Fang,Yanhui Yang,Xuxu Wang,Xianzhi Fu,Zizhong Zhang

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION（2025）

Fuzhou University | Nanjing Tech Univ

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Abstract

H2 and O2 evolutions occur simultaneously for conventional particulate photocatalytic overall water splitting (PPOWS), leading to a significant backward reaction and the formation of an explosive H2/O2 gas mixture. This is an issue that must be addressed prior to industrialization of PPOWS. Here, a convenient, cost‐effective, and scalable concept is introduced to uncouple hydrogen and oxygen production for PPOWS. Based on this idea, a three‐component photocatalyst, Co(5%)‐HPCN/(rGO/Pt), is constructed, consisting of a photoresponsive chip (HPCN), a H2 evolution cocatalyst (rGO/Pt), and a cobalt complex capable of reversibly binding O2 (Co), to achieve the decoupling of PPOWS under alternating UV and visible light irradiations. The asynchronous O2 and H2 evolution strategy have considerable flexibility regarding the photocatalyst structure and light sources suitable for PPOWS.

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Key words

photocatalytic,overall water splitting,reaction mechanism,carbon nitride chips,PPOWS decoupling

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