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- Title
Enhanced Hydrogen Evolution under Simulated Sunlight from Neutral Electrolytes on (ZnSe)<sub>0.85</sub>(CuIn<sub>0.7</sub>Ga<sub>0.3</sub>Se<sub>2</sub>)<sub>0.15</sub> Photocathodes Prepared by a Bilayer Method.
- Authors
Kaneko, Hiroyuki; Minegishi, Tsutomu; Nakabayashi, Mamiko; Shibata, Naoya; Domen, Kazunari
- Abstract
A (ZnSe)0.85(CuIn0.7Ga0.3Se2)0.15 photocathode with a bilayer structure was fabricated and found to exhibit a photocurrent almost twice that of a photocathode with a monolayer structure during hydrogen evolution from water. The cathodic photocurrent reached maximum values of 12 and 4.9 mA cm−2 at 0 and 0.6 VRHE in a neutral phosphate buffer under simulated sunlight, while the half-cell solar-to-hydrogen conversion efficiency was 3.0 % at 0.6 VRHE, with a maximum value of 3.6 % at 0.45 VRHE. Cross-sectional mapping of the electron-beam-induced current established that the increased photocurrent can be attributed to improved uniformity at the solid-liquid junction in the bilayer sample, which results in enhanced carrier collection.
- Subjects
PHOTOCATHODES; ELECTROCHEMISTRY; HYDROGEN production; HYDROGEN evolution reactions; CROSS-sectional method
- Publication
Angewandte Chemie International Edition, 2016, Vol 55, Issue 49, p15329
- ISSN
1433-7851
- Publication type
Article
- DOI
10.1002/anie.201609202