期刊
SOLAR ENERGY
卷 149, 期 -, 页码 188-194出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2017.03.036
关键词
Sol-Gel; Nanocomposites; Photoelectrochemical cell; Energy harvesting
资金
- Department of Science and Technology, New Delhi, India (DST) [SR/FT/CS-137/2010]
- University Grant Commission, New Delhi, India (UGC) [F 5-88/2014 (IC)]
- Florida State University, USA
Pure anatase titania (TiO2) nanoparticles were anchored on the surface of functionalized multi-walled carbon nanotubes (MWCNTs) using a solution-based synthetic method at room temperature. X-ray diffraction and Raman patterns were used to analyze the structural and phase composition of these nanocomposites, highlighting the formation of anatase TiO2 nanoparticles with MWCNTs up to 0.5 wt. %. The non-spherical particles of TiO2 in the order of 7-12 nm, were confirmed through transmission electron microscopy analysis and these particles were well dispersed on the MWCNTs. The optical absorption spectra of these structures were studied by diffuse reflectance UV-visible spectroscopy. The optical energy band gap of the various nanocomposites was observed from 3.2 to 2.6 eV with an increasing amount of MWCNTs, up to 0.5 wt.%. The generation of (OH)-O-center dot species in nanocomposites in the presence of visible light irradiation was investigated by photoluminescence spectroscopy. Photoelectrochemical cell performance of TiO2-MWCNTs for 0.5 wt.% content of MWCNTs under light intensity 100 mW/cm(2) showed a significant improvement of short-circuit current density from 1.23 to 12.1 mA/cm(2) and a cell efficiency (0.090-3.46%) that is better than many reported anatase-based compositions without sensitizer. (C) 2017 Elsevier Ltd. All rights reserved.
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