期刊
NATURE ENERGY
卷 2, 期 2, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nenergy.2016.192
关键词
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资金
- US Department of Energy, Office of Science, Office of Basic Energy Sciences, Solar Photochemistry Program [DEAC36-08GO28308]
Achieving solar-to-hydrogen efficiencies above 15% is key for the commercial success of photoelectrochemical water-splitting devices. While tandem cells can reach those efficiencies, increasing the catalytic activity and long-term stability remains a significant challenge. Here we show that annealing a bilayer of amorphous titanium dioxide (TiOx) and molybdenum sulfide (MoSx) deposited onto GaInP2 results in a photocathode with high catalytic activity (current density of 11mAcm(2) at 0V versus the reversible hydrogen electrode under 1 sun illumination) and stability (retention of 80% of initial photocurrent density over a 20 h durability test) for the hydrogen evolution reaction. Microscopy and spectroscopy reveal that annealing results in a graded MoSx/MoOx/TiO2 layer that retains much of the high catalytic activity of amorphous MoSx but with stability similar to crystalline MoS2. Our findings demonstrate the potential of utilizing a hybridized, heterogeneous surface layer as a cost-effiective catalytic and protective interface for solar hydrogen production.
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