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Research and Development of Titania-Based Nanostructured Materials for High Performance Thermoelectric Applications
Received date: 2013-07-12
Revised date: 2013-10-14
Online published: 2013-10-31
Thermoelectric materials, which can convert heat directly into electricity efficiently and vice versa, offer a new method to refrigeration and power generation. They therefore play an important role on solving intensified energy crisis and environmental problems. In traditional bulk thermoelectric materials, it is difficult to further improve their figure of merit (ZT) because of strong correlation between the physical parameters which determine the thermoelectric performance. Thermoelectric metal oxides are ideal candidates which can be used at middle and high temperatures, due to their good thermal stability. If the thermoelectric properties of titania-based materials can be improved, it would make an excellent thermoelectric material owing to its non-toxicity, good chemical and thermal stability, natural abundance, and simple preparation process. Nanotechnology provides a dominant approach to improve the thermoelectric properties in the last twenty years, resulting from its remarkable effect to decrease the thermal conductivity. Meanwhile, to enhance the electron-related power factor by tuning the interface and chemical composition is also an important method to further increase the thermoelectric properties. In this paper, we reviewed our recent research results on titania-based thermoelectric materials. Firstly, through the experimental observation of large Seebeck coefficient of titanate nanotubes, we considered that the two correlated parameters, namely electrical conductivity and thermal conductivity,can be tailored separately by using the peculiar tube morphology and layer structure of one-dimensional materials; Secondly, by studying the different scattering effect of carriers and phonons at the interface by synthesizing titania-based nanocomposites, we proposed to enhance the thermoelectric properties by designing electron energy filtering; Thirdly, we found that nanostructured and chemically tuned titania-based materials could be prepared by using chemical methods such as urea combustion and high-temperature sintering and thus would help us to cognize the transport response of electron and phonon to chemical composition and interface. Finally, the asymmetrical carrier transport theory was introduced, which possibly provided an important way to notably enhance the power factor of thermoelectric materials.
MIAO Lei , LIU Cheng-yan , ZHOU Jian-hua , ZHANG Ming . Research and Development of Titania-Based Nanostructured Materials for High Performance Thermoelectric Applications[J]. Advances in New and Renewable Energy, 2013 , 1(2) : 115 -130 . DOI: 10.3969/j.issn.2095-560X.2013.02.001
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