期刊
SCIENTIFIC REPORTS
卷 5, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep07951
关键词
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资金
- Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan
- Adaptable and Seamless Technology Transfer Program through Target-driven RD, JST [AS242Z00200L]
- Advanced Low Carbon Technology Research and Development Program (ALCA)
- JST through its Center of Innovation Science and Technology based Radical Innovation and Entrepreneurship Program (COI Program)
Direct conversion from heat to electricity is one of the important technologies for a sustainable society since large quantities of energy are wasted as heat. We report the development of a single-walled carbon nanotube (SWNT)-based high conversion efficiency, air-stable and flexible thermoelectric material. We prepared cobaltocene-encapsulated SWNTs (denoted CoCp2@SWNTs) and revealed that the material showed a negative-type (n-type) semiconducting behaviour (Seebeck coefficient: -41.8 mu V K-1 at 320 K). The CoCp2@SWNT film was found to show a high electrical conductivity (43,200 S m(-1) at 320 K) and large power factor (75.4 mu W m(-1) K-2) and the performance was remarkably stable under atmospheric conditions over a wide range of temperatures. The thermoelectric figure of merit (ZT) value of the CoCp2@SWNT film (0.157 at 320 K) was highest among the reported n-type organic thermoelectric materials due to the large power factor and low thermal conductivity (0.15 Wm(-1) K-1). These characteristics of the n-type CoCp2@SWNTs allowed us to fabricate a p-n type thermoelectric device by combination with an empty SWNT-based p-type film. The fabricated device exhibited a highly efficient power generation close to the calculated values even without any air-protective coating due to the high stability of the SWNT-based materials under atmospheric conditions.
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