Universität zu Köln

Pyeon, Myeongwhun, Rauch, Vanessa, Stadler, Daniel, Gursoy, Mehmet, Deo, Meenal, Goenuellue, Yakup, Fischer, Thomas, Hwang, Taejin and Mathur, Sanjay (2019). Magnetic Field-Assisted Control of Phase Composition and Texture in Photocatalytic Hematite Films. Adv. Eng. Mater., 21 (8). WEINHEIM: WILEY-V C H VERLAG GMBH. ISSN 1527-2648

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Abstract

We report the influence of external magnetic fields applied parallel or perpendicular to the substrate during plasma chemical vapor deposition (PECVD) of hematite (alpha-Fe2O3) nanostructures. Hematite films grown from iron precursors show pronounced changes in phase composition (pure hematite vs. coexistence of hematite and magnetite) and crystallographic textures depending upon whether PECVD is performed with or without the influence of external magnetic field. Static magnetic fields created by rod-type (RTMs) or disk-type magnets (DTMs) results in hematite films with anisotropic or equiaxed grains, respectively. Using RTMs, a superior photoelectrochemical (PEC) performance is obtained for hematite photoanodes synthesized under perpendicularly applied magnetic field (with respect to substrate), whereas parallel magnetic field results in the most efficient hematite photoanode in the case of DTM. The experimental data on microstructure and functional properties of hematite films show that application of magnetic fields has a significant effect on the crystallite size and texture with preferred growth and/or suppression of grains with specific texture in Fe2O3 films. Investigations on the water splitting properties of the hematite films in a photoelectrochemical reactor reveal that photocurrent values of hematite photoanodes are remarkably different for films deposited with (0.659 mA cm(-2)) or without (0.484 mA cm(-2)) external magnetic field.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Pyeon, Myeongwhun UNSPECIFIED UNSPECIFIED UNSPECIFIED Rauch, Vanessa UNSPECIFIED UNSPECIFIED UNSPECIFIED Stadler, Daniel UNSPECIFIED UNSPECIFIED UNSPECIFIED Gursoy, Mehmet UNSPECIFIED UNSPECIFIED UNSPECIFIED Deo, Meenal UNSPECIFIED UNSPECIFIED UNSPECIFIED Goenuellue, Yakup UNSPECIFIED UNSPECIFIED UNSPECIFIED Fischer, Thomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Hwang, Taejin UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-145281
DOI:	10.1002/adem.201900195
Journal or Publication Title:	Adv. Eng. Mater.
Volume:	21
Number:	8
Date:	2019
Publisher:	WILEY-V C H VERLAG GMBH
Place of Publication:	WEINHEIM
ISSN:	1527-2648
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 WATER-SPLITTING EFFICIENCY; OXIDE PHOTOANODES; NANOSTRUCTURES; PERFORMANCE; NANOTUBES; NANORODS Multiple languages Materials Science, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/14528