Yang Hao, Liu Yawen, Ding Yunxuan, Li Fusheng, Wang Linqin, Cai Bin, Zhang Fuguo, Liu Tianqi, Boschloo Gerrit, Johansson Erik M J, Sun Licheng
Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, 10044, Stockholm, Sweden.
Department of Chemistry-Ångström, Physical Chemistry, Uppsala University, 75120, Uppsala, Sweden.
Nat Commun. 2023 Sep 7;14(1):5486. doi: 10.1038/s41467-023-41187-9.
Despite considerable research efforts on photoelectrochemical water splitting over the past decades, practical application faces challenges by the absence of efficient, stable, and scalable photoelectrodes. Herein, we report a metal-halide perovskite-based photoanode for photoelectrochemical water oxidation. With a planar structure using mesoporous carbon as a hole-conducting layer, the precious metal-free FAPbBr photovoltaic device achieves 9.2% solar-to-electrical power conversion efficiency and 1.4 V open-circuit voltage. The photovoltaic architecture successfully applies to build a monolithic photoanode with the FAPbBr absorber, carbon/graphite conductive protection layers, and NiFe catalyst layers for water oxidation. The photoanode delivers ultralow onset potential below 0 V versus the reversible hydrogen electrode and high applied bias photon-to-current efficiency of 8.5%. Stable operation exceeding 100 h under solar illumination by applying ultraviolet-filter protection. The photothermal investigation verifies the performance boost in perovskite photoanode by photothermal effect. This study is significant in guiding the development of photovoltaic material-based photoelectrodes for solar fuel applications.
尽管在过去几十年里，人们在光电化学水分解方面进行了大量的研究工作，但由于缺乏高效、稳定且可扩展的光电极，实际应用面临着挑战。在此，我们报道了一种用于光电化学水氧化的金属卤化物钙钛矿基光阳极。通过使用介孔碳作为空穴传导层的平面结构，不含贵金属的FAPbBr光伏器件实现了9.2%的太阳能到电能转换效率和1.4 V的开路电压。这种光伏结构成功地应用于构建一个整体式光阳极，该光阳极由FAPbBr吸收层、碳/石墨导电保护层和用于水氧化的NiFe催化剂层组成。相对于可逆氢电极，该光阳极的起始电位超低，低于0 V，且具有8.5%的高外加偏压光子到电流效率。通过应用紫外线过滤保护，在太阳光照下稳定运行超过100小时。光热研究证实了光热效应提高了钙钛矿光阳极的性能。这项研究对于指导用于太阳能燃料应用的基于光伏材料的光电极的开发具有重要意义。
