Tailoring the Photoelectrochemical Activity of TiO2 Electrodes by Multilayer Screen-Printing

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dc.identifier.uri http://dx.doi.org/10.15488/10957
dc.identifier.uri https://www.repo.uni-hannover.de/handle/123456789/11039
dc.contributor.author Günnemann, Carsten
dc.contributor.author Curti, Mariano
dc.contributor.author Eckert, J. Gerrit
dc.contributor.author Schneider, Jenny
dc.contributor.author Bahnemann, Detlef W.
dc.date.accessioned 2021-05-19T05:33:10Z
dc.date.available 2021-05-19T05:33:10Z
dc.date.issued 2019
dc.identifier.citation Günnemann, C.; Curti, M.; Eckert, J.G.; Schneider, J.; Bahnemann, D.W.: Tailoring the Photoelectrochemical Activity of TiO2 Electrodes by Multilayer Screen-Printing. In: ChemCatChem 11 (2019), Nr. 24, S. 6439-6450. DOI: https://doi.org/10.1002/cctc.201901872
dc.description.abstract Screen‐printing is a commonly used method for the preparation of photoelectrodes. Although previous studies have explored the effect of the number of printed layers on the efficiency of dye‐sensitized solar cells, its interplay with the photoelectrocatalytic properties of the electrodes has rarely been examined. This study focuses on this issue by studying the photoelectrocatalytic oxidation of methanol over TiO2 electrodes. Incident photon‐to‐current efficiencies reached 87 % at the optimal conditions of monochromatic (338 nm) irradiation of one‐layer films at 0.2 V vs NHE. However, the irradiation wavelength and applied bias strongly influenced the relative behavior of the films. For instance, at 0.5 V and 327 nm irradiation, the one‐layer electrode was 6 times more efficient than the four‐layer one, while at 385 nm the four‐layer electrode was 3.5 times more efficient. The results were explained on the basis of differing light absorption properties and charge carrier lifetimes. Modelling and quantification of the electron diffusion length (5.7 μm) helped to explain why the two‐layer electrode (4.89 μm thick) showed the most consistent efficiencies across all conditions. Complementarily, transient absorption spectroscopy was used to correlate the thicknesses with charge carrier lifetimes. Electron transfer to FTO was apparent only for the thinner electrode. Our work shows that the optimization of photoelectrocatalytic processes should include the number of layers as a key variable. eng
dc.language.iso eng
dc.publisher Weinheim : WILEY-VCH Verlag
dc.relation.ispartofseries ChemCatChem 11 (2019), Nr. 24
dc.rights CC BY 4.0 Unported
dc.rights.uri https://creativecommons.org/licenses/by/4.0/
dc.subject screen‐printing eng
dc.subject solar cell eng
dc.subject photoelectrocatalytic oxidation eng
dc.subject.ddc 540 | Chemie ger
dc.title Tailoring the Photoelectrochemical Activity of TiO2 Electrodes by Multilayer Screen-Printing
dc.type Article
dc.type Text
dc.relation.essn 1867-3899
dc.relation.issn 1867-3880
dc.relation.doi https://doi.org/10.1002/cctc.201901872
dc.bibliographicCitation.issue 24
dc.bibliographicCitation.volume 11
dc.bibliographicCitation.firstPage 6439
dc.bibliographicCitation.lastPage 6450
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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