Nanoparticle heterojunctions in ZnS/ZnO hybrid nanowires for visible-light-driven photocatalytic hydrogen generation
Loo, Say Chye Joachim
Date of Issue2013
School of Materials Science and Engineering
We report one-step hydrothermal preparation of ZnS/ZnO hybrid nanowires consisting of well-distributed nanoparticle-heterojunctions that induce high activity for visible-light-driven H2 evolution even without any noble metal co-catalysts. During the growth process, the nanoparticulated ZnS nanowires formed first, followed by ZnO nanocrystal growth with intercalation inside the ZnS nanowires. This growth mode 10 could result in enriched ZnS-surface-states on the ZnO nanocrystal surfaces, as evidenced by the weakened absorption features and quenched band gap emission of ZnO in the ZnS/ZnO hybrid nanowires. Further studies by varying the ZnS to ZnO ratio in the ZnS/ZnO hybrids also proved that the population of ZnS-surface-states is crucial to the visible-light activity for photocatalytic H2 evolution. This work provides a meaningful way to develop heterostructured composites as visible-light-active photocatalysts 15 by using wide band gap semiconductors for solar fuels production.
© 2013 The Royal Society of Chemistry. This is the author created version of a work that has been peer reviewed and accepted for publication by CrystEngComm, The Royal Society of Chemistry. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [DOI: http://dx.doi.org/10.1039/C3CE40523K].