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Promoting the Thermoelectric Performance of Single-Walled Carbon Nanotubes by Inserting Discotic Liquid-Crystal Molecules
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-01-18 , DOI: 10.1021/acssuschemeng.0c08403 Xinxin Li 1, 2, 3 , Zikun Yu 1 , Houbo Zhou 3 , Fan Yang 4 , Fei Zhong 3 , Xianhua Mao 1 , Benzhang Li 3 , Hong Xin 1 , Chunmei Gao 1 , Lei Wang 3
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2021-01-18 , DOI: 10.1021/acssuschemeng.0c08403 Xinxin Li 1, 2, 3 , Zikun Yu 1 , Houbo Zhou 3 , Fan Yang 4 , Fei Zhong 3 , Xianhua Mao 1 , Benzhang Li 3 , Hong Xin 1 , Chunmei Gao 1 , Lei Wang 3
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Single-walled carbon nanotubes (SWCNTs) are desirable flexible thermoelectric materials in applications of large-scale low-grade thermal energy. However, weak Seebeck coefficients of SWCNTs around room temperature limit their development as a flexible power generator. In this work, we significantly improve the Seebeck coefficients of SWCNT-based composites by integrating the discotic liquid-crystal 2,3,6,7,10,11-hexakis(hexyloxy) triphenylene (HAT6) through the energy-filtering effect. The Seebeck coefficients of SWCNT/HAT6 composite films are about more than twice that of the pristine SWCNT films, and a maximum power factor of 408.23 ± 48.96 μW m–1 K–2 is achieved at room temperature, which is one of the highest values among organic small-molecule-based thermoelectric composites reported so far. The flexible power generator based on p-type SWCNT/HAT6 films is first assembled. An outstanding power density of 0.64 μW cm–2 with a thermoelectric voltage of 17.64 mV at a temperature gradient of 56 K is achieved. This study demonstrates that SWCNT/discotic liquid-crystal composites show great promise in thermoelectric (TE) materials and open a new avenue for the development of TE devices.
中文翻译：
通过插入盘状液晶分子来促进单壁碳纳米管的热电性能
单壁碳纳米管（SWCNT）是大规模低品位热能应用中理想的柔性热电材料。但是，室温下单壁碳纳米管的塞贝克系数很弱，限制了它们作为柔性发电机的发展。在这项工作中，我们通过能量过滤效应集成了盘状液晶2,3,6,7,10,11-六（己氧基）三亚苯基（HAT6），显着提高了SWCNT基复合材料的塞贝克系数。SWCNT / HAT6复合膜的塞贝克系数大约是原始SWCNT膜的塞贝克系数的两倍，最大功率因数为408.23±48.96μWm –1 K –2在室温下可达到该温度，这是迄今为止报道的基于有机小分子的热电复合材料中最高的值之一。首先组装基于p型SWCNT / HAT6薄膜的柔性发电机。在56 K的温度梯度下，具有17.4 mV的热电电压，可实现0.64μWcm -2的出色功率密度。这项研究表明，SWCNT /粘性液晶复合材料在热电（TE）材料中显示出广阔的前景，并为TE器件的开发开辟了新途径。
更新日期：2021-02-01
中文翻译：
通过插入盘状液晶分子来促进单壁碳纳米管的热电性能
单壁碳纳米管（SWCNT）是大规模低品位热能应用中理想的柔性热电材料。但是，室温下单壁碳纳米管的塞贝克系数很弱，限制了它们作为柔性发电机的发展。在这项工作中，我们通过能量过滤效应集成了盘状液晶2,3,6,7,10,11-六（己氧基）三亚苯基（HAT6），显着提高了SWCNT基复合材料的塞贝克系数。SWCNT / HAT6复合膜的塞贝克系数大约是原始SWCNT膜的塞贝克系数的两倍，最大功率因数为408.23±48.96μWm –1 K –2在室温下可达到该温度，这是迄今为止报道的基于有机小分子的热电复合材料中最高的值之一。首先组装基于p型SWCNT / HAT6薄膜的柔性发电机。在56 K的温度梯度下，具有17.4 mV的热电电压，可实现0.64μWcm -2的出色功率密度。这项研究表明，SWCNT /粘性液晶复合材料在热电（TE）材料中显示出广阔的前景，并为TE器件的开发开辟了新途径。
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