English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Tin doping speeds up hole transfer during light-driven water oxidation at hematite photoanodes

Dunn, H. K., Feckl, J. M., Müller, A., Fattakhova-Rohlfing, D., Morehead, S. G., Roos, J., et al. (2014). Tin doping speeds up hole transfer during light-driven water oxidation at hematite photoanodes. Physical Chemistry Chemical Physics, 16(44), 24610-24620. doi:10.1039/c4cp03946g.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-BBEB-A Version Permalink: http://hdl.handle.net/21.11116/0000-0001-6E64-4
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Dunn, Halina K.1, Author              
Feckl, Johann M.1, Author              
Müller, Alexander2, Author              
Fattakhova-Rohlfing, Dina1, Author              
Morehead, Samuel G.3, Author              
Roos, Julian3, Author              
Peter, Laurence M.4, Author              
Scheu, Christina5, Author              
Bein, Thomas1, Author              
Affiliations:
1Department of Chemistry and Center for NanoScience (CeNS), Ludwig-Maximilians- Universität München, Butenandtstr. 5-11, D-81377 Munich, Germany, ou_persistent22              
2Department of Chemistry and CeNS, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-11 (E), Munich, Germany, ou_persistent22              
3Department of Chemistry, Center for NanoScience (CeNS), Ludwig-Maximilians-Universität München, Butenandtstr. 11D-81377 Munich, Germany, ou_persistent22              
4Department of Chemistry, University of Bath, BA2 7AY, Bath, UK, ou_persistent22              
5Department of Chemistry and Center for NanoScience (CeNS), Ludwig-Maximilians Universität München, Germany, ou_persistent22              

Content

show
hide
Free keywords: INTENSITY-MODULATED PHOTOCURRENT; PHOTOELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; THIN-FILM ELECTRODES; DOPED HEMATITE; OXYGEN EVOLUTION; ALPHA-FE2O3 PHOTOANODES; ELECTRICAL-PROPERTIES; PERFORMANCE; KINETICS; OXIDEChemistry; Physics;
 Abstract: Numerous studies have shown that the performance of hematite photoanodes for light-driven water splitting is improved substantially by doping with various metals, including tin. Although the enhanced performance has commonly been attributed to bulk effects such as increased conductivity, recent studies have noted an impact of doping on the efficiency of the interfacial transfer of holes involved in the oxygen evolution reaction. However, the methods used were not able to elucidate the origin of this improved efficiency, which could originate from passivation of surface electron-hole recombination or catalysis of the oxygen evolution reaction. The present study used intensity-modulated photocurrent spectroscopy (IMPS), which is a powerful small amplitude perturbation technique that can de-convolute the rate constants for charge transfer and recombination at illuminated semiconductor electrodes. The method was applied to examine the kinetics of water oxidation on thin solution-processed hematite model photoanodes, which can be Sn-doped without morphological change. We observed a significant increase in photocurrent upon Sn-doping, which is attributed to a higher transfer efficiency. The kinetic data obtained using IMPS show that Sn-doping brings about a more than tenfold increase in the rate constant for water oxidation by photogenerated holes. This result provides the first demonstration that Sn-doping speeds up water oxidation on hematite by increasing the rate constant for hole transfer.

Details

show
hide
Language(s): eng - English
 Dates: 2014-11-28
 Publication Status: Published in print
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: ISI: 000344249400053
DOI: 10.1039/c4cp03946g
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Physical Chemistry Chemical Physics
  Abbreviation : Phys. Chem. Chem. Phys.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Cambridge, England : Royal Society of Chemistry
Pages: - Volume / Issue: 16 (44) Sequence Number: - Start / End Page: 24610 - 24620 Identifier: ISSN: 1463-9076
CoNE: /journals/resource/954925272413_1