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Red-Light-Driven Water Splitting by Au(Core)–CdS(Shell) Half-Cut Nanoegg with Heteroepitaxial Junction

A key material for artificial photosynthesis including water splitting is heteronanostructured (HNS) photocatalysts. The photocatalytic activity depends on the geometry and dimension, and the quality of junctions between the components. Here we present a half-cut Au(core)–CdS(shell) (HC-Au@CdS) nanoegg as a new HNS plasmonic photocatalyst for water splitting. UV-light irradiation of Au nanoparticle (NP)-loaded ZnO (Au/ZnO) at 50 °C induces the selective deposition of hexagonal CdS on the Au surface of Au/ZnO with an epitaxial (EPI) relation of CdS{0001}/Au{111}. The subsequent selective dissolution of the ZnO support at room temperature yields HC-Au@CdS with the Au NP size and EPI junction (#) retained. Red-light irradiation (λex = 640 nm) of HC-Au@#CdS gives rise to continuous stoichiometric water splitting with an unprecedentedly high external quantum yield of 0.24%.

Authors:   Shin-ichi Naya; Takahiro Kume; Ryo Akashi; Musashi Fujishima; Hiroaki Tada
Journal:   Journal of the American Chemical Society
Year:   2018
DOI:   10.1021/jacs.7b12972
Publication date:   19-Jan-2018
Facts, background information, dossiers
  • water splitting
  • ultraviolet light
  • temperature
  • quantum
  • photocatalysts
  • light
  • dissolution
  • deposition
  • artificial photosynthesis
More about American Chemical Society Publications
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