Abstract By investigating photoelectrochemical (PEC) performance of p and n-type Cu 2 O, we do an exploratory study on dual-photoelectrode tandem PEC cell consisting of p-Cu 2 O/Pt photocathode and n-Cu 2 O/Co–Pi photoanode for the first time. Benefiting from electron capture (Pt) and hole transfer (Co–Pi) layers, the photoelectrodes have better charge separation efficiency and faster charge transfer kinetics. The p-Cu 2 O/Pt||n-Cu 2 O/Co–Pi PEC cell finally achieves an unassisted photocurrent density of 0.09 mA/cm 2 after illumination for 1000 s, which preliminarily confirms the viewpoint of unassisted overall water splitting. We then anticipate this work can provide a novel platform for the design and fabrication of various PEC energy conversion devices with excellent performance. Graphic Abstract

中文翻译：

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基于 p- 和 n-Cu2​​O 光电极的无辅助串联光电化学电池

摘要 通过研究 p 型和 n 型 Cu 2 O 的光电化学 (PEC) 性能，我们对由 p-Cu 2 O/Pt 光电阴极和 n-Cu 2 O/Co-Pi 组成的双光电极串联 PEC 电池进行了探索性研究。第一次光阳极。受益于电子捕获（Pt）和空穴转移（Co-Pi）层，光电极具有更好的电荷分离效率和更快的电荷转移动力学。p-Cu 2 O/Pt||n-Cu 2 O/Co-Pi PEC电池在照射1000 s后最终达到了0.09 mA/cm 2 的无辅助光电流密度，初步证实了无辅助整体水分解的观点。我们预计这项工作可以为设计和制造各种性能优异的 PEC 能量转换装置提供一个新的平台。图形摘要