| Literature DB >> 28033010 |
Jingyuan Liu1, Takashi Hisatomi1,2, Dharmapura H K Murthy3, Miao Zhong1,2, Mamiko Nakabayashi4, Tomohiro Higashi1,2, Yohichi Suzuki3, Hiroyuki Matsuzaki3, Kazuhiko Seki3, Akihiro Furube3,5, Naoya Shibata4, Masao Katayama1,2, Tsutomu Minegishi1,2,6, Kazunari Domen1,2.
Abstract
Particulate La5Ti2CuS5O7 (LTC) photocathodes prepared by particle transfer show a positive onset potential of 0.9 V vs RHE for the photocathodic current in photoelectrochemical (PEC) H2 evolution. However, the low photocathodic current imposes a ceiling on the solar-to-hydrogen energy conversion efficiency of PEC cells based on LTC photocathodes. To improve the photocurrent, in this work, the surface of Mg-doped LTC photocathodes was modified with TiO2, Nb2O5, and Ta2O5 by radio frequency reactive magnetron sputtering. The photocurrent of the modified Mg-doped LTC photocathodes was doubled because these oxides formed type-II heterojunctions and extended the lifetimes of photogenerated charge carriers. The enhanced photocathodic current was attributed to hydrogen evolution at a positive potential of +0.7 V vs RHE. This work opens up possibilities for improving PEC hydrogen evolution on particulate photocathodes based on surface oxide modifications and also highlights the importance of the band gap alignment.Entities:
Year: 2017 PMID： 28033010 DOI： 10.1021/acs.jpclett.6b02735
Source DB: PubMed Journal: J Phys Chem Lett ISSN： 1948-7185 Impact factor: 6.475