期刊
NANO LETTERS
卷 18, 期 2, 页码 805-810出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b04020
关键词
Photovoltage; overall water splitting; Z-scheme; surface photovoltage spectroscopy
类别
资金
- Sao Paulo Research Foundation (FAPESP-Grant) [2014/22388-3]
- National Science Foundation (NSF Grant) [1464938]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0015329]
- Division Of Chemistry [1464938] Funding Source: National Science Foundation
Surface photovoltage spectroscopy (SPS) is used to measure the photopotential across a Ru-STiO3:Rh/BiVO4 particle tandem overall water splitting photocatalyst. The tandem is Synthesized from Ru-modified SrTiO3:Rh nanocrystals and BiVO4 microcrystals by electrostatic assembly followed by thermal annealing. It splits water into H-2 and O-2 with an apparent quantum efficiency of 1.29% at 435 nm and a Solar to hydrogen conversion efficiency of 0.028%. According to SPS, a photovoltage develops above 2.20 eV, the effective band gap of the tandem, and reaches its maximal value of -2.45 V at 435 nm (2.44 mW cm(-2)), which corresponds to 96% of the theoretical limit of the photocatalyst film on the fluorine-doped tin-oxide-coated glass (FTO) substrate: Charge separation is 82% reversible with 18% of charge Carriers being trapped in defect states. The unusually strong light intensity dependence of the photovoltage (1.16 V per decade) is attributed to depletion layer changes inside of the BiVO4 microcrystals. These findings promote the understanding, of solar energy conversion with inorganic particle photocatalysts.
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