Photoanodic and photocathodic behaviour of La5Ti2CuS5O7 electrodes in the water splitting reaction

Autor:	Takashi Hisatomi, Kazunari Domen, Tsutomu Minegishi, Yosuke Moriya, Akihiro Furube, Kazuhiko Seki, Aki Iwanaga, Taro Yamada, Rupashree Balia Singh, Hiroshi Nishiyama, Yohichi Suzuki, Guijun Ma, Jingyuan Liu, Masao Katayama
Rok vydání:	2015
Předmět:	Semiconductor Materials science Band gap business.industry Electrode Analytical chemistry Water splitting Charge carrier General Chemistry Semiconductor device business Electronic band structure Photocathode
Zdroj:	Chemical Science. 6:4513-4518
ISSN:	2041-6539 2041-6520
DOI:	10.1039/c5sc01344e
Popis:	The particulate semiconductor La5Ti2CuS5O7 (LTC) with a band gap energy of 1.9 eV functioned as either a photocathode or a photoanode when embedded onto Au or Ti metal layers, respectively. By applying an LTC/Au photocathode and LTC/Ti photoanode to, respectively, photoelectrochemical (PEC) water reduction and oxidation concurrently, zero-bias overall water splitting was accomplished under visible light irradiation. The band structures of LTC/Au and LTC/Ti calculated using a semiconductor device simulator (AFORS-HET) confirmed the critical role of the solid/solid junction of the metal back contact in the charge separation and PEC properties of LTC photoelectrodes. The prominently long lifetime of photoexcited charge carriers in LTC, confirmed by transient absorption spectroscopy, allowed the utilization of both photoexcited electrons and holes depending on the band structure at the solid/solid junction.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e121394d30ae8f8db59337cbe51484a7 https://doi.org/10.1039/c5sc01344e Zobrazit plný text záznamu