Multi-wall carbon nanotube counter electrodes for dye-sensitized solar cells prepared by electrophoretic deposition |
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Authors: | Jeng-Yu Lin Chih-Heng Lien Shu-Wei Chou |
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Institution: | (1) Department of Chemical Engineering, Tatung University, Taipei, 104, Taiwan;(2) Department of Chemical Engineering, National Tsing-Hua University, Hsinchu, 300, Taiwan |
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Abstract: | In this study, electrophoretic deposition (EPD) was employed to fabricate multi-wall carbon nanotube (MWCNT) counter electrodes
(CEs) for dye-sensitized solar cells (DSSCs). Firstly, raw MWCNTs were functionalized by means of an acid mixture solution
and then subjected to EPD. The results obtained from Raman spectroscopy, Fourier transform infrared spectroscopy, field-emission
scanning electron microscope, and cyclic voltammogram demonstrated that the defects and open ends on the MWCNTs can be obtained
via chemical functionalization and thus facilitate the enhancement in the electrocatalytic activity for I3− reduction of MWCNT CEs. In addition to optimizing chemical functionalization of MWCNTs surface, the optimal thickness of
MWCNT CEs prepared by EPD was also investigated. Additionally, consecutive cyclic voltammetric tests demonstrated that the
MWCNT CE fabricated by EPD possessed excellent electrochemical stability. In comparison with MWCNT CEs fabricated by tape-casting
approach, MWCNT CEs prepared by EPD presented a superior adhesion between MWCNT deposits and conducting glass substrates.
Therefore, MWCNT CEs fabricated by EPD can be of great potential for use in low-cost plastic DSSCs. |
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