材料科学
石墨
电子迁移率
热电效应
塞贝克系数
热电材料
电阻率和电导率
电子
助推器(火箭)
复合材料
氧化物
石墨烯
热导率
复合数
凝聚态物理
纳米技术
光电子学
热力学
电气工程
物理
冶金
工程类
量子力学
天文
作者
Subhra Sourav Jana,Tanmoy Maiti
标识
DOI:10.1021/acsami.1c24625
摘要
Inherent insulating nature of oxides makes it challenging for use in thermoelectric applications that warrant reasonable electrical conductivity. In the present work, we have used graphite (G) to improve the electron transport in La0.07Sr0.93Ti0.93Nb0.07O3 (LSTN) by making composites. Graphite acts as the electron momentum booster in the LSTN matrix, which otherwise suffers from Anderson localization of electrons, causing an order of magnitude increase in weighted mobility and electrical conductivity. As a result, the thermoelectric power factor increases more than 6 times due to graphite incorporation in LSTN. Furthermore, the lattice thermal conductivity is suppressed due to enhanced Umklapp scattering, as derived from the Debye-Callaway model. Hence, we have recorded ∼423% increment in the figure of merit (ZT) in LSTN + G composites. The maximum ZT obtained is 0.68 at 980 K for the LSTN with 1 wt % graphite composite. Furthermore, we have fabricated a four-legged n-type thermoelectric power generator demonstrating a milliwatt level power output, which hitherto remained unattainable for oxide thermoelectrics.
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