Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 109, Issue 39, Pages 15640-15645Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1118326109
Keywords
cobalt oxide; transient absorption spectroscopy; iron oxide; photoelectrochemistry
Categories
Funding
- Engineering and Physical Sciences Resarch Council
- European Research Council (Project Intersolar)
- Swiss Federal Office of Energy [102326]
- European Commission's Framework Project 7 (NanoPEC) [227179]
- EPSRC [EP/F00270X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/F00270X/1] Funding Source: researchfish
Ask authors/readers for more resources
This paper addresses the origin of the decrease in the external electrical bias required for water photoelectrolysis with hematite photoanodes, observed following surface treatments of such electrodes. We consider two alternative surface modifications: a cobalt oxo/hydroxo-based (CoOx) overlayer, reported previously to function as an efficient water oxidation electrocatalyst, and a Ga2O3 overlayer, reported to passivate hematite surface states. Transient absorption studies of these composite electrodes under applied bias showed that the cathodic shift of the photocurrent onset observed after each of the surface modifications is accompanied by a similar cathodic shift of the appearance of long-lived hematite photoholes, due to a retardation of electron/hole recombination. The origin of the slower electron/hole recombination is assigned primarily to enhanced electron depletion in the Fe2O3 for a given applied bias.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available