Colloidal dual-band gap cell for photocatalytic hydrogen generation

Wei Li*, Graeme O'Dowd, Thomas J. Whittles, David Hesp, Yvonne Gründer, Vinod R. Dhanak, Frank Jäckel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish
Pages (from-to)16606-16610
Number of pages5
JournalNanoscale
Volume7
Issue number40
Early online date19 Sep 2015
DOIs
Publication statusPublished - 28 Oct 2015

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