期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 22, 期 42, 页码 22756-22762出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm35095e
关键词
-
资金
- National High Technology Research and Development Program of China (863 Program) [2011AA050522]
- International Cooperation S and T Cooperation Program of China [2010DFA64360, 2010DFA61410]
Searching for suitable platinum-free electrocatalysts toward novel iodine-free redox couples is of vital importance for further cost reduction and large-scale implementation of dye-sensitized solar cells (DSCs). Herein, cross-stacked superaligned carbon nanotube (CSCNT) sheets were incorporated as efficient economical cathodes in organic disulfide/thiolate redox electrolyte mediated DSCs. Electrochemical characterization revealed that the CSCNT sheets exhibited notably higher electrocatalytic activity toward the disulfide/thiolate redox shuttle over that of ubiquitous platinized cathodes, featuring a significantly decreased charge transfer resistance (ca. 1.26 Omega cm(2)) and a 4-fold attenuated apparent activation energy (ca. 6.90 kJ mol(-1)) for disulfide reduction, as well as excellent electrochemical stability. Such a superior electrocatalytic activity was mainly attributed to the synergistic effect of the high specific surface area, relatively open structure for electrolyte accessibility and defect-rich CSCNT cathode. A device incorporating a CSCNT cathode confers a high fill factor of 0.67 and power conversion efficiencies up to 5.81%, which are significantly higher than 0.54 and 4.54% for that with a sputtered Pt cathode. Our investigations demonstrate not only the attractive feasibility of replacing scarce platinum cathodes with abundant carbon materials for novel iodine-free electrolytes, but also the importance of suitable catalyst redox coupling for progress in developing low-cost and high-efficiency DSCs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据