Colloidal dual-band gap cell for photocatalytic hydrogen generation

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

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.

Publication DOI: https://doi.org/10.1039/C5NR04950D
Divisions: Engineering & Applied Sciences
Engineering & Applied Sciences > European Bioenergy Research Institute (EBRI)
Uncontrolled Keywords: Materials Science(all)
Full Text Link: http://xlink.rs ... ?DOI=C5NR04950D
Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
Published Date: 2015-10-28
Authors: Li, Wei ( 0000-0003-4036-467X)
O'Dowd, Graeme
Whittles, Thomas J.
Hesp, David
Gründer, Yvonne
Dhanak, Vinod R.
Jäckel, Frank

Download

[img]

Version: Accepted Version


Export / Share Citation


Statistics

Additional statistics for this record