中国科学院福建物构所王要兵团队开发了效率为6.9%的耦合太阳能电池。相关研究成果发表在2023年5月31日出版的《德国应用化学》。

太阳能电池中的太阳能到电化学储能是一种重要的太阳能利用技术，可与太阳能到电（太阳能电池）和太阳能到燃料（光催化电池）转换相媲美。与将光电极与氧化还原电极相结合的集成太阳能液流电池的间接方法不同，耦合太阳能电池能够实现直接太阳能存储，但由于材料的快速电荷复合和电极之间的能级错位而受到低效率的阻碍。

该文中，研究人员提出了一种耦合太阳能电池的设计方法，该电池在光电化学存储阴极和阳极的共光泵浦下通过电子-离子转移将两个光电耦合离子转移（PCIT）反应相互耦合。使用具有代表性的共价有机框架（COF）来实现两个带匹配的光电化学存储电极之间的有效电荷分离和定向电荷转移，光电压足以进行COF双氧化还原反应。通过泵送这些电极，耦合太阳能电池通过电子-质子中继的COF氧化和还原的两个协同PCIT反应存储太阳能，并且在放电中的COF再生过程中存储的太阳能作为电化学能量释放，同时使回路互锁。实现了效率的突破（6.9%），适用于大面积（56cm2）串联器件。所提出的光电耦合电子-离子转移（PIEIT）机制为太阳能到电化学储能的应用提供了可扩展的途径。

附：英文原文

Title: Coupled Solar Battery with 6.9% Efficiency

Author: Lei Jiao, Xiang Zhang, Yangyang Feng, Jing Lin, Daqiang Yuan, Yaobing Wang

Issue&Volume: 2023-05-31

Abstract: Solar-to-electrochemical energy storage in solar batteries is an important solar utilization technology comparable to solar-to-electricity (solar cells) and solar-to-fuel (photocatalytic cells) conversion. Unlike the indirect approach of integrated solar flow batteries combining photoelectrodes with redox-electrodes, coupled solar batteries enable direct solar energy storage, but are hampered by low efficiency due to rapid charge recombination of materials and misaligned energy levels between electrodes. Herein, we propose a design for a coupled solar battery that intercouples two photo-coupled ion transfer (PCIT) reactions through electron-ion transfer upon co-photo-pumping of photoelectrochemical storage cathode and anode. We used a representative covalent organic framework (COF) to achieve efficient charge separation and directional charge transfer between two band-matched photoelectrochemical storage electrodes, with a photovoltage sufficient for COF dual-redox reactions. By pumping these electrodes, the coupled solar battery stores solar energy via two synergistic PCIT reactions of electron-proton-relayed COF oxidation and reduction, and the stored solar energy is released as electrochemical energy during COF regeneration in discharge while interlocking the loops. A breakthrough in efficiency (6.9%) was achieved, adaptive to a large-area (56 cm2) tandem device. The presented photo-intercoupled electron-ion transfer (PIEIT) mechanism provides expandable paths toward practical solar-to-electrochemical energy storage.

DOI: 10.1002/anie.202306506

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202306506