Universität zu Köln

Graf, David, Queralto, Albert ORCID: 0000-0001-9101-0033, Lepcha, Ashish, Appel, Linus, Frank, Michael and Mathur, Sanjay (2020). Electrospun SrNb2O6 photoanodes from single-source precursors for photoelectrochemical water splitting. Sol. Energy Mater. Sol. Cells, 210. AMSTERDAM: ELSEVIER. ISSN 1879-3398

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Abstract

Electrospinning of SrNb2O6 nanofibers from a single bimetallic alkoxide precursor [SrNb2((OPr)-Pr-i)(12)((HOPr)-Pr-i)] and the application of resulting oxide nanofiber meshes as potential photoanode material for solar water splitting is reported. Direct formation of single phase SrNb2O6 nanofibers from the precursor gel was favored by the tailored Sr:Nb ratio (1:2) and preordering of cations through Sr-O(R)-Nb units present in the molecular precursor. X-ray diffraction and photoelectron spectroscopy confirmed the chemical composition and formation of SrNb2O6 phase. A minor amount of orthorhombic SrNb6O16 phase was observed, when small excess of alkali metal was present during the precursor synthesis. The optical bandgap of photoelectrodes, produced by doctor blading and spin coating of the nanofibers, revealed bandgap energies between 3.25 and 3.43 eV, owing to different microstructure of the photoelectrodes. The measurement of photoelectrochemical properties in basic conditions showed photocurrent density values at 1.23 eV ranging from 0.06 mA/cm(2) to 0.16 mA/cm(2). A maximum value of 0.6 mA/cm(2) was obtained for spin-coated nanofiber photoelectrodes.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Graf, David UNSPECIFIED UNSPECIFIED UNSPECIFIED Queralto, Albert UNSPECIFIED orcid.org/0000-0001-9101-0033 UNSPECIFIED Lepcha, Ashish UNSPECIFIED UNSPECIFIED UNSPECIFIED Appel, Linus UNSPECIFIED UNSPECIFIED UNSPECIFIED Frank, Michael UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, Sanjay UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-329995
DOI:	10.1016/j.solmat.2020.110485
Journal or Publication Title:	Sol. Energy Mater. Sol. Cells
Volume:	210
Date:	2020
Publisher:	ELSEVIER
Place of Publication:	AMSTERDAM
ISSN:	1879-3398
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 PHOTOCATALYTIC ACTIVITY; OPTICAL-PROPERTIES; THIN-FILMS; NIOBIUM; STRONTIUM; NANOFIBERS; TANTALUM; HYDROGEN; CRYSTAL; BARIUM Multiple languages Energy & Fuels; Materials Science, Multidisciplinary; Physics, Applied Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/32999