Influence of ionic liquid on the photoelectrochemical properties of ZnO particles

Influence of ionic liquid on the photoelectrochemical properties of ZnO particles

Author Trindade, Leticia G. da Google Scholar
Minervino, Gabriela Bosco Autor UNIFESP Google Scholar
Trench, Aline B. Google Scholar
Carvalho, Maria H. Google Scholar
Assis, Marcelo Google Scholar
Li, Maximo S. Google Scholar
Oliveira, Adilson J. A. de Google Scholar
Pereira, Ernesto C. Google Scholar
Mazzo, Tatiana Martelli Autor UNIFESP Google Scholar
Longo, Elson Google Scholar
Abstract ZnO particles synthesized by the microwave-assisted hydrothermal method were sensitized with different amounts of ionic liquid (IL) 1.3-dimethylimidazolium iodide (MMI.I). The structure of the modified and unmodified ZnO particles were characterized by X-ray diffraction, Raman spectroscopy, field emission gun-scanning electron microscopy (FEG-SEM), ultraviolet-visible (UV-vis) absorption spectroscopy, photoluminescence (PL), and photoelectrochemical measurements. While the sensitization of ZnO particles by the ionic liquid does not change the ZnO phase, it reduces the particle size and converts shallow defects to deep defects. These changes cause the photocurrent density of the ZnO/IL films to increase significantly from 0.05 mA cm(-2) for pure ZnO to 0.52 and 1.24 mA cm(-2) for the ZnO films containing 20% and 35% by mass of the IL, respectively, at 1.08 V vs. Ag/AgCl. This about 24-fold increase in the photocurrent density of the ZnO/IL35 sample may indicate that the MMI.I IL may be acting as a dye, since it is constituted by an organic part, MMI+. This good performance presented by this sample indicates that this is a promising material for photoanode in solar cells.
Keywords Optical properties
ZnO
Electrodes
Language English
Sponsor CNPq
FAPESP
CAPES
Grant number CNPq: 159387/2015-9
FAPESP: 2013/07296-2
Date 2018
Published in Ceramics International. Oxford, v. 44, n. 9, p. 10393-10401, 2018.
ISSN 0272-8842 (Sherpa/Romeo, impact factor)
Publisher Elsevier Sci Ltd
Extent 10393-10401
Origin http://dx.doi.org/10.1016/j.ceramint.2018.03.053
Access rights Closed access
Type Article
Web of Science ID WOS:000431470200050
URI http://repositorio.unifesp.br/handle/11600/45976

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