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Highly Efficient Photoelectrochemical Hydrogen Generation Reaction Using Tungsten Phosphosulfide Nanosheets
journal contribution
posted on 2018-05-04, 00:00 authored by Vediyappan Veeramani, Hsin-Chin Yu, Shu-Fen Hu, Ru-Shi LiuThe initiation of
hydrogen energy production from sunlight through photoelectrochemical
(PEC) system is an important strategy for resolving contemporary issues
in energy requirement. Although precious Pt and other noble metals
offer a desirable catalytic activity for this method, earth-abundant
nonprecious metal catalysts must be developed for wide-scale application.
In this regard, P-type silicon (P-Si) micropyramids (Si MPs) are a
favorable photocathode because of their effective light-conversion
properties and appropriate band gap position. In this study, we developed
amorphous tungsten phosphosulfide nanosheets (WS2–xPx NSs) on Si MPs through
a simple thermal annealing process for solar-driven hydrogen evolution
reaction. The P substitution in the nanostructure effectively produced
many defective sites at the edges. The product exhibited an efficient
photocurrent density of 19.11 mA cm–2 at 0 V and
a low onset potential of 0.21 VRHE compared with tungsten
disulfide (WS2; 13.43 mA cm–2). The fabricated
catalyst also showed desirable stability for up to 8 h for the WS0.60P1.40@Si MPs photocathode. The extraordinary
activity could be due to numerous active sites provided by heteroatoms
(sulfur and phosphorus) in the edges, resulting in dwindling reaction
kinetics barrier and enhanced PEC activity.
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reaction kinetics barriertungsten phosphosulfide nanosheetsSi MPs photocathodesolar-driven hydrogen evolution reaction0.21 V RHEcmPECNSmAhydrogen energy productionsiteearth-abundant nonprecious metal catalystsEfficient Photoelectrochemical Hydrogen Generation ReactionSi MPsband gap positionTungsten Phosphosulfide NanosheetsWS 0.60 P 1.40
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