title: Solar-to-hydrogen efficiency exceeding 2.5% achieved for overall water splitting with an all earth-abundant dual-photoelectrode.
abstract: The solar-to-hydrogen (STH) efficiency of a traditional mono-photoelectrode photoelectrochemical water splitting system has long been limited as large external bias is required. Herein, overall water splitting with STH efficiency exceeding 2.5% was achieved using a self-biased photoelectrochemical-photovoltaic coupled system consisting of an all earth-abundant photoanode and a Si-solar-cell-based photocathode connected in series under parallel illumination. We found that parallel irradiation mode shows higher efficiency than tandem illumination especially for photoanodes with a wide light absorption range, probably as the driving force for water splitting reaction is larger and the photovoltage loss is smaller in the former. This work essentially takes advantage of a tandem solar cell which can enhance the solar-to-electricity efficiency from another point of view.
authors: State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences; Dalian National Laboratory for Clean Energy, Dalian, 116023, China. canli@dicp.ac.cn jingyingshi@dicp.ac.cn.
authors: Chunmei
authors: C
authors: Ding
authors: Wei
authors: W
authors: Qin
authors: Nan
authors: N
authors: Wang
authors: Guiji
authors: G
authors: Liu
authors: Zhiliang
authors: Z
authors: Wang
authors: Pengli
authors: P
authors: Yan
authors: Jingying
authors: J
authors: Shi
authors: Can
authors: C
authors: Li