材料科学
碳纳米管
热电效应
塞贝克系数
热导率
解耦(概率)
热电发电机
电阻率和电导率
热电材料
纳米颗粒
纳米技术
功率密度
纳米线
复合材料
光电子学
功率(物理)
电气工程
热力学
物理
控制工程
工程类
作者
Kuncai Li,Xu Sun,Yizhuo Wang,Jing Wang,Xiaolin Dai,Yan Yao,Bin Chen,Daotong Chong,Junjie Yan,Hong Wang
出处
期刊:Small
[Wiley]
日期:2023-08-30
标识
DOI:10.1002/smll.202304266
摘要
Generating sufficient power from waste heat is one of the most important things for thermoelectric (TE) techniques in numerous practical applications. The output power density of an organic thermoelectric generator (OTEG) is proportional to the power factors (PFs) and the electrical conductivities of organic materials. However, it is still challenging to have high PFs over 1 mW m-1 K-2 in free-standing films together with high electrical conductivities over 1000 S cm-1 . Herein, densifying multi-walled carbon nanotube (MWCNT) films would increase their electrical conductivity dramatically up to over 10 000 S cm-1 with maintained high Seebeck coefficients >60 µV K-1 , thus leading to ultrahigh PFs of 7.25 and 4.34 mW m-1 K-2 for p- and n-type MWCNT films, respectively. In addition, it is interesting to notice that the electrical properties increase faster than the thermal conductivities, resulting in enhanced ZT of 3.6 times in MWCNT films. An OTEG made of compressed MWCNT films is fabricated to demonstrate the heat-to-electricity conversion ability, which exhibits a high areal output power of ∼12 times higher than that made of pristine MWCNT films. This work demonstrates an effective way to high-performance nanowire/nanoparticle-based TE materials such as printable TE materials comprised of nanowires/nanoparticles.
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