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Ultra-high temperature synthesis of high-performance Zintl thermoelectrics

超高温合成高性能Zintl热电材料

基本信息

批准号：
EP/J000884/1
负责人：
Jan-Willem Bos
金额：
$ 10.15万
依托单位：
Heriot-Watt University
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2011
资助国家：
英国
起止时间：
2011 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FJ000884%2F1
关键词：
Ultra temperature synthesis performance Zintl

项目摘要

Technologies that enable the efficient use of energy could have an enormous impact on the most pressing issues of today: global warming and the reliance on ever-dwindling supplies of fossil fuels.The proposed research addresses this topical challenge through the investigation of the next generation of thermoelectric materials that harvest waste heat and transform it into useful electricity. In particular, the research is focused on thermoelectric materials that can operate at high temperatures, which is essential as the Carnot efficiency (the thermodynamic maximum) increases with temperature difference.The scientific challenge is to optimise three competing material parameters; the Seebeck voltage; the electrical and thermal conductivity, and to do this in a material with good temperature stability.The novelty of the proposed research derives from the use of ultra-high temperature synthesis to achieve temperature stability, and the synergistic exploitation of Zintl chemistry and interfaces in nanocomposites to obtain large thermoelectric figures of merit.Zintl phases are key high-performance thermoelectric materials because the simultaneous presence of ionic and covalent regions enables a more independent optimisation of the thermoelectric parameters compared to electronically homogeneous materials. Two classes of promising Zintl-type phases have been identified, and the performance of outstanding bulk materials will be further enhanced through the use of interfaces in nanocomposites.This ambitious and transformative research programme will contribute towards the development of high-performance thermoelectric materials operating at temperatures most suitable to power generation, enabling 20-30% energy conversion efficiencies. The research will also lead to an increased understanding of the relation between composition, structure and thermoelectric properties.

高效利用能源的技术可能会对当今最紧迫的问题产生巨大影响：全球变暖和对日益减少的化石燃料供应的依赖。拟议中的研究通过调查下一代热电材料来应对这一主题挑战，这种材料可以收集废热并将其转化为有用的电力。特别是，研究的重点是能够在高温下工作的热电材料，这是至关重要的，因为卡诺效率(热力学最大值)随着温度的不同而增加。科学挑战是优化三个相互竞争的材料参数：塞贝克电压；这项研究的新颖性来自于使用超高温合成来实现温度稳定性，以及协同利用锌化学和纳米复合材料中的界面来获得大的热电系数。锌相是关键的高性能热电材料，因为离子和共价区的同时存在使热电参数能够比电子均质材料更独立地优化。已经确定了两类有希望的锌型相，并将通过在纳米复合材料中使用界面来进一步增强优秀块体材料的性能。这一雄心勃勃的、具有变革性的研究计划将有助于开发在最适合发电的温度下工作的高性能热电材料，使能量转换效率达到20%-30%。这项研究还将使人们对组成、结构和热电性能之间的关系有更深入的了解。