光电阴极
光电流
串联
分解水
制氢
析氧
材料科学
电极
能量转换效率
可逆氢电极
光电子学
氢
光电化学电池
太阳能电池
纳米技术
电化学
化学
光催化
工作电极
催化作用
电解质
电子
物理化学
复合材料
有机化学
物理
量子力学
生物化学
作者
Tomohiro Higashi,Hiroshi Nishiyama,Yohichi Suzuki,Yutaka Sasaki,Takashi Hisatomi,Masao Katayama,Tsutomu Minegishi,Kazuhiko Seki,Taro Yamada,Kazunari Domen
标识
DOI:10.1002/anie.201812081
摘要
Abstract Photoelectrochemical water splitting is regarded as a promising approach to the production of hydrogen, and the development of efficient photoelectrodes is one aspect of realizing practical systems. In this work, transparent Ta 3 N 5 photoanodes were fabricated on n‐type GaN/sapphire substrates to promote O 2 evolution in tandem with a photocathode, to realize overall water splitting. Following the incorporation of an underlying GaN layer, a photocurrent of 6.3 mA cm −2 was achieved at 1.23 V vs. a reversible hydrogen electrode. The transparency of Ta 3 N 5 to wavelengths longer than 600 nm allowed incoming solar light to be transmitted to a CuInSe 2 (CIS), which absorbs up to 1100 nm. A stand‐alone tandem cell with a serially‐connected dual‐CIS unit terminated with a Pt/Ni electrode was thus constructed for H 2 evolution. This tandem cell exhibited a solar‐to‐hydrogen energy conversion efficiency greater than 7 % at the initial stage of the reaction.
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