期刊
ENERGY & ENVIRONMENTAL SCIENCE
卷 7, 期 10, 页码 3334-3337出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ee01914h
关键词
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资金
- Joint Center for Artificial Photosynthesis
- DOE Energy Innovation Hub
- Office of Science of the U.S. Department of Energy [DE-SC0004993]
- National Science Foundation for support from an NSF Graduate Research Fellowship
- Beckman Institute Materials
- Laser Resource Centers
- NSF [CHE-1305124]
Although II-VI semiconductors such as CdS, CdTe, CdSe, ZnTe, and alloys thereof can have nearly ideal band gaps and band-edge positions for the production of solar fuels, II-VI photoanodes are well-known to be unstable towards photocorrosion or photopassivation when in contact with aqueous electrolytes. Atomic-layer deposition (ALD) of amorphous, leaky TiO2 films coated with thin films or islands of Ni oxide has been shown to robustly protect Si, GaAs, and other III-V materials from photocorrosion and therefore to facilitate the robust, solar-driven photoelectrochemical oxidation of H2O to O-2(g). We demonstrate herein that ALD-deposited 140 nm thick amorphous TiO2 films also effectively protect single crystalline n-CdTe photoanodes from corrosion or passivation. An n-CdTe/TiO2 electrode with a thin overlayer of a Ni-oxide based oxygen-evolution electrocatalyst produced 435 +/- 15 mV of photovoltage with a light-limited current density of 21 +/- 1 mA cm(-2) under 100 mW cm(-2) of simulated Air Mass 1.5 illumination. The ALD-deposited TiO2 films are highly optically transparent and electrically conductive. We show that an n-CdTe/TiO2/Ni oxide electrode enables the stable solar-driven oxidation of H2O to O-2(g) in strongly alkaline aqueous solutions, where passive, intrinsically safe, efficient systems for solar-driven water splitting can be operated.
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