Hydrothermal growth of MoS2/Co3S4composites as efficient Pt-free counter electrodes for dye-sensitized solar cells

Autor: Dong, Feiyan, Guo, Yanjun, Xu, Peng, Yin, Xiong, Li, Yuangang, He, Meng
Zdroj: Science China Materials; April 2017, Vol. 60 Issue: 4 p295-303, 9p
Abstrakt: MoS2/Co3S4composite films were prepared via a facile one-step hydrothermal method, and used as efficient and low-cost Pt-free counter electrodes (CEs) for dye-sensitized solar cells (DSSCs). Characterizations revealed that Co3S4and MoS2were obtained simultaneously during the facile hydrothermal process. The composites afforded a promising synergistic effect on the catalyzing of triiodide reduction. Enhanced electrocatalytic performance of the resultant composite films was confirmed through cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) analyses. DSSCs using MoS2/Co3S4composite CEs outperform the devices with pristine MoS2or Co3S4CEs in power conversion efficiency (PCE). Furthermore, a PCE of 6.77% is obtained for the optimized devices using MoS2/Co3S4composite CEs measured under standard 1 sun illumination (100 mW cm−2, AM 1.5G), which is comparable to that of the devices fabricated under the same conditions with conventional thermally deposited Pt CEs (7.14%). The results demonstrate that MoS2/Co3S4composites are promising alternatives to Pt to be applied as CEs for DSSCs. 染料敏化太阳电池因其成本低、稳定性好、工艺简便而备受关注. 发展高性能、廉价的材料代替传统的贵金属铂对电极是当前染 料敏化太阳电池领域的研究热点之一. 二硫化钼纳米材料具有高比表面积和大量的催化位点, 是较为理想的铂对电极替代材料之一, 但较 低的电导率限制了二硫化钼对电极性能的进一步提高. 本文首次报道了由二硫化钼纳米材料与金属性的四硫化三钴复合制备染料敏化 太阳电池对电极, 该复合对电极可以利用水热方法一步合成. 研究结果表明, 使用该复合对电极的染料敏化太阳电池光电转换效率可达 6.77%, 接近于使用铂对电极的器件(7.14%), 优于使用单一二硫化钼(4.64%)或四硫化三钴(5.11%)作为对电极的器件.
Databáze: Supplemental Index
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