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It is important to improve the apparent quantum yields (AQYs) of narrow bandgap photocatalysts to achieve efficient H production. The present work demonstrates a particulate solid solution of zinc selenide and copper gallium selenide (denoted as ZnSe:CGSe) that evolves H efficiently and is responsive to visible light up to 725 nm. This material was synthesized using a flux-assisted method and was found to comprise single-crystalline tetrahedral particles. The coloading of Ni and Rh, Pt, Pd or Ru as cocatalysts further improved the photocatalytic H evolution rate over this photocatalyst. With the optimal coloading of a Ni-Ru composite cocatalyst, an AQY of 13.7% was obtained at 420 nm during a sacrificial H evolution reaction, representing the highest value yet reported for a photocatalyst with an absorption edge longer than 700 nm. The present study demonstrates that the preparation of single-crystalline particles and the rational assembly of composite cocatalysts are effective strategies that allow the efficient utilization of long wavelengths by metal selenide photocatalysts for solar fuel production.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8159321 | PMC |
| http://dx.doi.org/10.1039/d0sc01167c | DOI Listing |
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