Colloidal dual-band gap cell for photocatalytic hydrogen generation

Li, Wei, O'Dowd, Graeme, Whittles, Thomas J, Hesp, David, Gruender, Yvonne, Dhanak, Vinod R and Jaeckel, Frank
(2015) Colloidal dual-band gap cell for photocatalytic hydrogen generation. NANOSCALE, 7 (40). pp. 16606-16610.

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We report that the internal quantum efficiency for hydrogen generation in spherical, Pt-decorated CdS nanocrystals can be tuned by quantum confinement, resulting in higher efficiencies for smaller than for larger nanocrystals (17.3% for 2.8 nm and 11.4% for 4.6 nm diameter nanocrystals). We attribute this to a larger driving force for electron and hole transfer in the smaller nanocrystals. The larger internal quantum efficiency in smaller nanocrystals enables a novel colloidal dual-band gap cell utilising differently sized nanocrystals and showing larger external quantum efficiencies than cells with only one size of nanocrystals (9.4% for 2.8 nm particles only and 14.7% for 2.8 nm and 4.6 nm nanocrystals). This represents a proof-of-principle for future colloidal tandem cell.

Item Type: Article
Uncontrolled Keywords: 40 Engineering, 34 Chemical Sciences, 3406 Physical Chemistry, 4018 Nanotechnology, 7 Affordable and Clean Energy
Depositing User: Symplectic Admin
Date Deposited: 04 May 2016 14:45
Last Modified: 20 Jun 2024 22:00
DOI: 10.1039/c5nr04950d
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