Universität zu Köln

Leduc, Jennifer, Goenuellue, Yakup, Ghamgosar, Pedram ORCID: 0000-0002-7893-7405, You, Shujie ORCID: 0000-0001-7475-6394, Mouzon, Johanne ORCID: 0000-0003-4582-0902, Choi, Heechae ORCID: 0000-0002-9390-6607, Vomiero, Alberto, Grosch, Matthias and Mathur, Sanjay ORCID: 0000-0003-2765-2693 (2019). Electronically-Coupled Phase Boundaries in alpha-Fe2O3/Fe3O4 Nanocomposite Photoanodes for Enhanced Water Oxidation. ACS Appl. Nano Mater., 2 (1). S. 334 - 351. WASHINGTON: AMER CHEMICAL SOC. ISSN 2574-0970

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Abstract

Photoelectrochemical (PEC) water splitting reactions are promising for sustainable hydrogen production from renewable sources. We report here, the preparation of alpha-Fe2O3/Fe3O4 composite films via a single-step chemical vapor deposition of [Fe((OBu)-Bu-t)(3)](2) and their use as efficient photoanode materials in PEC setups. Film thickness and phase segregation was controlled by varying the deposition time and corroborated through cross-section Raman spectroscopy and scanning electron microscopy. The highest water oxidation activity (0.48 mA/cm(2) at 1.23 V vs RHE) using intermittent AM 1.5 G (100 mW/cm(2)) standard illumination was found for hybrid films with a thickness of 11 mu m. This phenomenon is attributed to an improved electron transport resulting from a higher magnetite content toward the substrate interface and an increased light absorption due to the hematite layer mainly located at the top surface of the film. The observed high efficiency of alpha-Fe2O3/Fe3O4 nanocomposite photoanodes is attributed to the close proximity and establishment of 3D interfaces between the weakly ferro- (Fe2O3) and ferrimagnetic (Fe3O4) oxides, which in view of their differential chemical constitution and valence states of Fe ions (Fe2+/Fe3+) can enhance the charge separation and thus the overall electrical conductivity of the layer.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Leduc, Jennifer UNSPECIFIED UNSPECIFIED UNSPECIFIED Goenuellue, Yakup UNSPECIFIED UNSPECIFIED UNSPECIFIED Ghamgosar, Pedram UNSPECIFIED orcid.org/0000-0002-7893-7405 UNSPECIFIED You, Shujie UNSPECIFIED orcid.org/0000-0001-7475-6394 UNSPECIFIED Mouzon, Johanne UNSPECIFIED orcid.org/0000-0003-4582-0902 UNSPECIFIED Choi, Heechae UNSPECIFIED orcid.org/0000-0002-9390-6607 UNSPECIFIED Vomiero, Alberto UNSPECIFIED UNSPECIFIED UNSPECIFIED Grosch, Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED orcid.org/0000-0003-2765-2693 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-139131
DOI:	10.1021/acsanm.8b01936
Journal or Publication Title:	ACS Appl. Nano Mater.
Volume:	2
Number:	1
Page Range:	S. 334 - 351
Date:	2019
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	2574-0970
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:	Keywords Language IRON-OXIDE FILMS; GENERALIZED GRADIENT APPROXIMATION; TOTAL-ENERGY CALCULATIONS; OXYGEN VACANCIES; HEMATITE PHOTOANODE; ULTRATHIN FILMS; SURFACE-STATES; EVOLUTION; ACTIVATION; EFFICIENCY Multiple languages Nanoscience & Nanotechnology; Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/13913