Barreca, Davide ORCID: 0000-0002-8779-3386, Carraro, Giorgio ORCID: 0000-0002-3771-8548, Gasparotto, Alberto ORCID: 0000-0003-4626-651X, Maccato, Chiara ORCID: 0000-0001-6368-5754, Warwick, Michael E. A., Kaunisto, Kimmo, Sada, Cinzia, Turner, Stuart, Goenuellue, Yakup, Ruoko, Tero-Petri, Borgese, Laura, Bontempi, Elza ORCID: 0000-0003-1656-7506, Van Tendeloo, Gustaaf, Lemmetyinen, Helge ORCID: 0000-0002-8432-2028 and Mathur, Sanjay (2015). Fe2O3-TiO2 Nano-heterostructure Photoanodes for Highly Efficient Solar Water Oxidation. Adv. Mater. Interfaces, 2 (17). HOBOKEN: WILEY. ISSN 2196-7350

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Abstract

Harnessing solar energy for the production of clean hydrogen by photoelectrochemical water splitting represents a very attractive, but challenging approach for sustainable energy generation. In this regard, the fabrication of Fe2O3-TiO2 photoanodes is reported, showing attractive performances [approximate to 2.0 mA cm(-2) at 1.23 V vs. the reversible hydrogen electrode in 1 M NaOH] under simulated one-sun illumination. This goal, corresponding to a tenfold photoactivity enhancement with respect to bare Fe2O3, is achieved by atomic layer deposition of TiO2 over hematite (alpha-Fe2O3) nanostructures fabricated by plasma enhanced-chemical vapor deposition and final annealing at 650 degrees C. The adopted approach enables an intimate Fe2O3-TiO2 coupling, resulting in an electronic interplay at the Fe2O3/TiO2 interface. The reasons for the photocurrent enhancement determined by TiO2 overlayers with increasing thickness are unraveled by a detailed chemico-physical investigation, as well as by the study of photogenerated charge carrier dynamics. Transient absorption spectroscopy shows that the increased photoelectrochemical response of heterostructured photoanodes compared to bare hematite is due to an enhanced separation of photogenerated charge carriers and more favorable hole dynamics for water oxidation. The stable responses obtained even in simulated seawater provides a feasible route in view of the eventual large-scale generation of renewable energy.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Barreca, DavideUNSPECIFIEDorcid.org/0000-0002-8779-3386UNSPECIFIED
Carraro, GiorgioUNSPECIFIEDorcid.org/0000-0002-3771-8548UNSPECIFIED
Gasparotto, AlbertoUNSPECIFIEDorcid.org/0000-0003-4626-651XUNSPECIFIED
Maccato, ChiaraUNSPECIFIEDorcid.org/0000-0001-6368-5754UNSPECIFIED
Warwick, Michael E. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kaunisto, KimmoUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sada, CinziaUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Turner, StuartUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Goenuellue, YakupUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ruoko, Tero-PetriUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Borgese, LauraUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bontempi, ElzaUNSPECIFIEDorcid.org/0000-0003-1656-7506UNSPECIFIED
Van Tendeloo, GustaafUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lemmetyinen, HelgeUNSPECIFIEDorcid.org/0000-0002-8432-2028UNSPECIFIED
Mathur, SanjayUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-386827
DOI: 10.1002/admi.201500313
Journal or Publication Title: Adv. Mater. Interfaces
Volume: 2
Number: 17
Date: 2015
Publisher: WILEY
Place of Publication: HOBOKEN
ISSN: 2196-7350
Language: English
Faculty: Faculty of Mathematics and Natural Sciences
Divisions: Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Inorganic Chemistry
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
ULTRATHIN HEMATITE FILMS; CHARGE-CARRIER DYNAMICS; LAYER-BY-LAYER; THIN-FILM; HYDROGEN-PRODUCTION; PHOTOELECTROCHEMICAL PERFORMANCE; TI; ALPHA-FE2O3; NANOSTRUCTURES; SEPARATIONMultiple languages
Chemistry, Multidisciplinary; Materials Science, MultidisciplinaryMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/38682

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