Water splitting, as a powerful technology for converting renewable energy into hydrogen energy, suffers from the kinetically sluggish oxygen evolution reaction (OER). Herein, encouraged by the structural characteristic of layered double hydroxide (LDH), CoCr LDH was proposed, for the first time, to verify the photoelectric synergy towards catalyzing OER. Under AM 1.5 irradiation, the optimal CoCr LDH presents a 1.35∼1.5-fold enhanced OER intrinsic activity and a faster charge transfer, thus achieving a decreased overpotential of 28 mV at 100 mA cm⁻² in 1.0 M KOH. Meanwhile, the H₂ amount produced at the cathode also increases 1.8 times. The synergistic enhancement in the highly active Co³⁺ sites and the charge transfer, both triggered by the photo-generated carriers on CoCr LDH, is mainly responsible for such a remarkably improved activity. This proof-of-concept study provides a reasonable and scalable platform towards engineering the self-consistent catalysts for the photoelectric synergy system.

作为一种将可再生能源转化为氢能的有力技术，水分解法会遭受动力学缓慢的氧气析出反应（OER）的困扰。在此，受层状双氢氧化物（LDH）的结构特性的启发，首次提出了CoCr LDH，以验证对催化OER的光电协同作用。在AM 1.5辐照下，最佳的CoCr LDH表现出1.35〜1.5倍的OER本征活性增强和更快的电荷转移，因此在100 mA cm ^-2的1.0 M KOH中实现了28 mV的过低电势降低。同时，在阴极产生的H ₂量也增加了1.8倍。高活性Co ^3+中的协同增强这些位点和电荷转移都是由CoCr LDH上的光生载流子触发的，这是导致这种活性显着提高的主要原因。该概念验证研究为设计用于光电协同系统的自洽催化剂提供了合理且可扩展的平台。