Cu₂O is a typical photoelectrocatalyst for sustainable hydrogen production, while the fast charge recombination hinders its further development. Herein, Ni²⁺ cations have been doped into a Cu₂O lattice (named as Ni‐Cu₂O) by a simple hydrothermal method and act as electron traps. Theoretical results predict that the Ni dopants produce an acceptor impurity level and lower the energy barrier of hydrogen evolution. Photoelectrochemical (PEC) measurements demonstrate that Ni‐Cu₂O exhibits a photocurrent density of 0.83 mA cm⁻², which is 1.34 times higher than that of Cu₂O. And the photostability has been enhanced by 7.81 times. Moreover, characterizations confirm the enhanced light‐harvesting, facilitated charge separation and transfer, prolonged charge lifetime, and increased carrier concentration of Ni‐Cu₂O. This work provides deep insight into how acceptor‐doping modifies the electronic structure and optimizes the PEC process.

中文翻译：

---

用于光电化学水分解的Cu2O光电阴极中的受体掺杂加速电荷分离：理论和实验研究。

Cu ₂ O是用于可持续制氢的典型光电催化剂，而快速的电荷复合阻碍了其进一步发展。在这里，通过简单的水热法将Ni ²⁺阳离子掺杂到Cu ₂ O晶格中（称为Ni-Cu ₂ O）并充当电子陷阱。理论结果预测，Ni掺杂剂会产生受体杂质，并降低氢逸出的能垒。光电化学（PEC）测量表明，Ni-Cu ₂ O的光电流密度为0.83 mA cm ^-2，是Cu _2的1.34倍O.且光稳定性提高了7.81倍。此外，表征还证实了增强的光捕获，便利的电荷分离和转移，延长的电荷寿命以及增加的Ni-Cu ₂ O载流子浓度。这项工作为深入了解受体掺杂如何修饰电子结构和优化PEC工艺提供了深刻的见解。 。