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  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.

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Dunn, Halina K.1, Autor           
Feckl, Johann M.1, Autor           
Müller, Alexander2, Autor           
Fattakhova-Rohlfing, Dina1, Autor           
Morehead, Samuel G.3, Autor           
Roos, Julian3, Autor           
Peter, Laurence M.4, Autor           
Scheu, Christina5, Autor           
Bein, Thomas1, Autor           
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              

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Schlagwörter: INTENSITY-MODULATED PHOTOCURRENT; PHOTOELECTROCHEMICAL IMPEDANCE SPECTROSCOPY; THIN-FILM ELECTRODES; DOPED HEMATITE; OXYGEN EVOLUTION; ALPHA-FE2O3 PHOTOANODES; ELECTRICAL-PROPERTIES; PERFORMANCE; KINETICS; OXIDEChemistry; Physics;
 Zusammenfassung: 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.

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Sprache(n): eng - English
 Datum: 2014-11-28
 Publikationsstatus: Erschienen
 Seiten: 11
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: ISI: 000344249400053
DOI: 10.1039/c4cp03946g
 Art des Abschluß: -

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Titel: Physical Chemistry Chemical Physics
  Kurztitel : Phys. Chem. Chem. Phys.
Genre der Quelle: Zeitschrift
 Urheber:
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Ort, Verlag, Ausgabe: Cambridge, England : Royal Society of Chemistry
Seiten: - Band / Heft: 16 (44) Artikelnummer: - Start- / Endseite: 24610 - 24620 Identifikator: ISSN: 1463-9076
CoNE: https://pure.mpg.de/cone/journals/resource/954925272413_1