Nanocrystalline Structure and Thermoelectric Properties of Electrospun NaCo2O4 Nanofibers

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• 作者：Feiyue Ma ; Yun Ou ; Yang Yang ; Yuanming Liu ; Shuhong Xie ; Jing-Feng Li ; Guozhong Cao ; Roger Proksch ; Jiangyu Li
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：December 23, 2010
• 年：2010
• 卷：114
• 期：50
• 页码：22038-22043
• 全文大小：323K
• 年卷期：v.114,no.50(December 23, 2010)
• ISSN：1932-7455

文摘

High-efficiency thermoelectric oxide materials are promising for the conversion of waste heat directly into electricity, and nanostructure engineering is effective in enhancing thermoelectric figure of merit through phonon scattering at grain boundaries and interfaces. In this work, we report a sol−gel-based electrospinning technique to synthesize thermoelectric NaCo₂O₄ nanofibers with grain size as small as 10 nm, orders of magnitude smaller than that of NaCo₂O₄ powders processed by conventional sol−gel techniques. A series of scanning probe microscopy (SPM) studies are carried out to measure the electric conduction in a single NaCo₂O₄ nanofiber, and the thermoelectric effect of a single NaCo₂O₄ nanofiber is also characterized using a novel thermal probing technique that induces a large temperature gradient in the nanofiber. Sintering of nanocrystalline nanofibers into bulk NaCo₂O₄ ceramics for thermoelectric energy harvesting is also discussed.