Journal
CARBON
Volume 158, Issue -, Pages 802-807Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2019.11.057
Keywords
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Funding
- National Key Research and Development Program of China [2018YFA0702100, 2018YFB0703600]
- National Natural Science Foundation of China [51872009, 561534001]
- Fundamental Research Funds for the Central Universities
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Carbon nanotubes (CNTs) are promising flexible thermoelectric materials in the field of large-scale low-grade thermal energy utilization. However, the relatively poor thermoelectric performance of CNTs near ambient temperature is a big issue for their application as flexible power generator. Here, we improved the thermoelectric properties of SWCNT films in a wide temperature range from room temperature (RT) to 200 degrees C via facile thermal annealing process. The effects of heat treatment at different temperatures and atmospheres on the thermoelectric properties of SWCNT films were studied. A maximum power factor (PF) of 113.7 mu W/m.K-2 at RT is obtained with average PF 111.7 mu W/m.K-2 in the RT to 200 degrees C range, which is more than threefold the value of as-prepared SWCNT film. Flexible and compact power generator based on annealed p-type SWCNT films and n-type polyethylenimine-doped SWCNT films with 8 couples of p-n legs was assembled. An outstanding output power of 1.16 mu W with power density of 0.48 W/m(2) at temperature difference 49.5 K was achieved. The device showed good air stability within one month and excellent mechanical flexibility. This study thus provides a feasible and low-cost strategy for high power energy generation. (C) 2019 Elsevier Ltd. All rights reserved.
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