Bifunctional One-Dimensional Hierarchical Nanostructures Composed of Cobalt Sulfide Nanoclusters on Carbon Nanotubes Backbone for Dye-Sensitized Solar Cells and Supercapacitors

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• 作者：Jeng-Yu Lin ; Sheng-Yen Tai ; Shu-Wei Chou
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：January 16, 2014
• 年：2014
• 卷：118
• 期：2
• 页码：823-830
• 全文大小：415K
• ISSN：1932-7455

文摘

One-dimensional (1D) hierarchical nanostructures composed of CoS_1.097 nanoclusters directly grown on carbon nanotube (CNT) backbone (CNT@CoS_1.097) were successfully synthesized by a facile glucose-assisted hydrothermal method. It was found that glucose acted as a binder to assist the hierarchical CoS_1.097 nanoclusters grown on the surfaces of CNTs with uniform coverage along the longitudinal axis. The extensive electrochemical measurements confirmed that the CNT@CoS_1.097 nanocomposite indeed provided simultaneously enhanced electrical conductivity and superior electrochemical activity as electrode materials for dye-sensitized solar cells (DSCs) and supercapacitors (SCs). The DSC assembled with the CNT@CoS_1.097 nanocomposite counter electrode (CE) achieved an enhanced photovoltaic conversion of 7.18% to those of DSCs based on the Pt, CNT, and CoS_1.097 CEs. Additionally, serving as a SC electrode, this nanocomposite delivered a remarkable specific capacitance of 541 F g^鈥? at 32 A g^鈥? and a stable reversible specific capacitance of 640 F g^鈥? after consecutive 3000 charge/discharge at 8 A g^鈥?. These results demonstrate that the CNT@CoS_1.097 nanocomposite electrode is quite promising to be considered for high-performance DSCs and high-rate SCs.