石墨烯
材料科学
色素敏化染料
三碘化物
氧化物
电催化剂
纳米管
辅助电极
电极
纳米技术
塔菲尔方程
化学工程
电化学
碳纳米管
化学
电解质
工程类
物理化学
冶金
作者
Hong Yuan,Qingze Jiao,Jia Liu,Xiufeng Liu,Hongxun Yang,Yun Zhao,Qin Wu,Daxin Shi,Hansheng Li
标识
DOI:10.1016/j.jpowsour.2016.10.062
摘要
A novel ultrathin-walled Co9S8 nanotube/reduced graphene oxide electrocatalyst, for the first time, is successfully prepared by a simple hydrothermal process coupling with an ion exchange process for the reduction of triiodide in dye-sensitized solar cells (DSSC). Ultrathin-walled Co9S8 nanotubes have an average diameter of 20–30 nm and a wall thickness of 3–4 nm, and the reduced graphene oxide possessing high conductivity is well dispersed in the Co9S8 nanotubes simultaneously, which contributed to the high specific surface area, well exposed active sites and excellent electric conductivity. The electrochemical performances of ultrathin-walled Co9S8 nanotube/reduced graphene oxide are evaluated by the EIS, Tafel polarization and CV measurements, exhibiting the significant improvement of electrocatalytic performance for the triiodide reduction. Optimizing the film thickness of Co9S8 nanotube/reduced graphene oxide counter electrode, the optimum photovoltaic conversion efficiency of 7.58% is obtained, which is even higher than that of the DSSC with Pt counter electrode (7.45%). In addition, the DSSC with Co9S8/reduced graphene oxide electrode exhibits a good repeatability and long-term electrochemical stability. Therefore, the ultrathin-walled Co9S8 nanotube/reduced graphene oxide is a reliable material to replace Pt.
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