NDLI: Positive onset potential and stability of Cu2O-based photocathodes in water splitting by atomic layer deposition of a Ga2O3 buffer layer

Content Provider	Royal Society of Chemistry (RSC)
Author	Li, Changli Hisatomi, Takashi Watanabe, Osamu Delaunay, Jean-Jacques Nakabayashi, Mamiko Domen, Kazunari Shibata, Naoya
Copyright Year	2015
Abstract	The Cu2O-based photocathode is considered as one of the most promising photocathodes for high performance water splitting under sunlight. However, the relatively negative onset potential for H2 production of these photocathodes impedes further optimization of the solar-to-fuel conversion efficiency. Here, a thin Ga2O3 buffer layer is introduced between the Cu2O absorber layer and the TiO2 protective layer by atomic layer deposition to increase the photovoltage. For the optimized TiO2 deposition temperature, the Pt/TiO2/Ga2O3/Cu2O electrode achieves a high cathodic photocurrent of −2.95 mA cm−2 at 0 V vs. RHE and an extremely positive onset potential of 1.02 V vs. RHE (defined as the potential where photocathodic current reaches 20 μA cm−2 under air-mass 1.5 global illumination), benefiting from a buried p–n junction and a favorable band alignment. The Pt/TiO2/Ga2O3/Cu2O electrodes exhibit a stable cathodic current for 2 h under continuous illumination of a 500 W Xe lamp for the TiO2 deposition temperatures below 180 °C.
Starting Page	1493
Ending Page	1500
Page Count	8
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	8
Issue Number	5
Journal	Energy & Environmental Science
DOI	10.1039/c5ee00250h
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Subscribed
Subject Keyword	RHE Photocathode Water splitting Mathematical optimization Gallium(III) oxide Atomic layer deposition Electrode Photocurrent Global illumination P\u2013n junction Partial current
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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