Electrochemical deposition of Fe2O3 in the presence of organic additives: a route to enhanced photoactivity

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dc.identifier.uri http://dx.doi.org/10.15488/152
dc.identifier.uri http://www.repo.uni-hannover.de/handle/123456789/170
dc.contributor.author Taffa, Dereje H. ger
dc.contributor.author Hamm, Ines ger
dc.contributor.author Dunkel, Christian ger
dc.contributor.author Sinev, Ilya ger
dc.contributor.author Bahnemann, Detlef W. ger
dc.contributor.author Wark, Michael ger
dc.date.accessioned 2015-12-15T14:08:06Z
dc.date.available 2015-12-15T14:08:06Z
dc.date.issued 2015-11-16
dc.identifier.citation Taffa, Dereje H.; Hamm, Ines; Dunkel, Christian; Sinev, Ilya; Bahnemann, Detlef W.; Wark, Michael: Electrochemical deposition of Fe2O3 in the presence of organic additives: a route to enhanced photoactivity. In: RSC Advances 5 (2015), Nr. 125, S. 103512-103522. DOI: http://dx.doi.org/10.1039/C5RA21290A
dc.description.abstract The photoelectrochemical activity of hematite films prepared by electrochemical deposition (ED) in the presence of organic additives is discussed. The studies focus on the role of small organic additive molecules in the tuning of the morphology of the films and their influence on the photoelectrochemical oxidation of water. The organic additives, namely, coumarin 343 (C343), γ-glucuronic acid (GA) and sodium dodecyl sulfonate (Sds), possess functional moieties to interact with iron ions in the ED bath electrostatically or through metal–ligand complexation reactions. XPS measurements prove that the organic additives are incorporated, and the oxidation state of Fe3+ rules out the presence of mixed valences in the films. SEM and XRD measurements present morphological and structural evidence, respectively. The photoelectrochemical study shows that organically modified hematite films exhibit enhanced photoactivity; the photocurrent density at 1.4 V vs. RHE on a GA-modified electrode is up to 5–6 times higher than on the unmodified electrode. Electrochemical impedance results reveal the role of the organic additives in reducing the charge transfer resistance from the hematite surface to the solution. In addition, a simple Ti post treatment greatly enhances the photoactivity of all electrodes under investigation. eng
dc.description.sponsorship DFG/WA 1116/23-1
dc.language.iso eng eng
dc.publisher Cambridge : Royal Society of Chemistry
dc.relation.ispartofseries RSC Advances 5 (2015), Nr. 125
dc.rights CC BY-NC 3.0 Unported
dc.rights.uri http://creativecommons.org/licenses/by-nc/3.0/
dc.subject electrochemical deposition eng
dc.subject Fe2O3 eng
dc.subject organic additives eng
dc.subject photoelectrochemical activity eng
dc.subject hematite films eng
dc.subject coumarin 343 eng
dc.subject γ-glucuronic acid eng
dc.subject sodium dodecyl sulfonate eng
dc.subject metal-ligand complexation reactions eng
dc.subject Elektrochemische Abscheidung ger
dc.subject Fe2O3 ger
dc.subject Organische Additive ger
dc.subject Photoelektrochemische Aktivität ger
dc.subject Metall-Ligand-Komplexreaktionen ger
dc.subject Komplexreaktion ger
dc.subject.classification Galvanische Abscheidung ger
dc.subject.classification Eisenoxide ger
dc.subject.classification Additiv ger
dc.subject.classification Ligandenaustauschreaktion ger
dc.subject.ddc 540 | Chemie ger
dc.title Electrochemical deposition of Fe2O3 in the presence of organic additives: a route to enhanced photoactivity eng
dc.type article
dc.type Text
dc.relation.essn 2046-2069
dc.relation.doi http://dx.doi.org/10.1039/C5RA21290A
dc.bibliographicCitation.issue 125
dc.bibliographicCitation.volume 5
dc.bibliographicCitation.date 2015
dc.bibliographicCitation.firstPage 103512
dc.bibliographicCitation.lastPage 103522
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


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