Universität zu Köln

Lepcha, A., Maccato, C., Mettenboerger, A., Andreu, T., Mayrhofer, L., Walter, M., Olthof, S., Ruoko, T. -P., Klein, A., Moseler, M., Meerholz, K., Morante, J. R., Barreca, D. and Mathur, S. (2015). Electrospun Black Titania Nanofibers: Influence of Hydrogen Plasma-Induced Disorder on the Electronic Structure and Photoelectrochemical Performance. J. Phys. Chem. C, 119 (33). S. 18835 - 18843. WASHINGTON: AMER CHEMICAL SOC. ISSN 1932-7455

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Abstract

This work encompasses a facile method for tailoring surface defects in electrospun TiO2 nanofibers by employing hydrogen plasma treatments. This amiable processing method was proven with SQUID, EPR, and XPS to be highly effective in generating oxygen vacancies, accompanied by the reduction of Ti4+ centers to Ti3+, resulting in the formation of black titania. The treatment temperature was found to affect the Ti3+/Ti4+ ratios and surface valence, while preserving the original 1D morphology of the titania fibers. Ab initio DFT calculations showed that a high concentration of oxygen vacancies is highly efficient in producing midgap states that enhance the system absorption over the whole visible range, as observed with UV/vis/NIR diffuse reflectance spectroscopy. Pristine TiO2 nanofibers produced a photocurrent density of similar to 0.02 mA/cm(2) at 1.23 V vs RHE, whereas the hydrogen plasma treatment resulted in up to a 10-fold increase in the photoelectrochemical performance.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Lepcha, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Maccato, C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mettenboerger, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Andreu, T. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mayrhofer, L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Walter, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Olthof, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Ruoko, T. -P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Klein, A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Moseler, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Meerholz, K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Morante, J. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Barreca, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mathur, S. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-396279
DOI:	10.1021/acs.jpcc.5b02767
Journal or Publication Title:	J. Phys. Chem. C
Volume:	119
Number:	33
Page Range:	S. 18835 - 18843
Date:	2015
Publisher:	AMER CHEMICAL SOC
Place of Publication:	WASHINGTON
ISSN:	1932-7455
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language WATER; SURFACE; NANOSTRUCTURES; NANOPARTICLES; TEMPERATURE; CONVERSION; DEFECTS; ARRAYS; CELLS; XPS Multiple languages Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/39627