Colloidal dual-band gap cell for photocatalytic hydrogen generation


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.

Publication DOI:
Divisions: College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > Energy and Bioproducts Research Institute (EBRI)
Uncontrolled Keywords: General Materials Science
Publication ISSN: 2040-3372
Last Modified: 08 Jul 2024 07:20
Date Deposited: 27 Oct 2015 10:00
Full Text Link: ... ?DOI=C5NR04950D
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2015-10-28
Published Online Date: 2015-09-19
Authors: Li, Wei (ORCID Profile 0000-0003-4036-467X)
O'Dowd, Graeme
Whittles, Thomas J.
Hesp, David
Gründer, Yvonne
Dhanak, Vinod R.
Jäckel, Frank



Version: Accepted Version

Export / Share Citation


Additional statistics for this record