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Layered Oxides Thermoelectrics for High Temperature Waste heat Recovery

用于高温余热回收的层状氧化物热电材料

基本信息

批准号：
EP/N029232/1
负责人：
Jonathan Alaria
金额：
$ 12.82万
依托单位：
University of Liverpool
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2016
资助国家：
英国
起止时间：
2016 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FN029232%2F1
关键词：
Layered Oxides Thermoelectrics Temperature Waste

项目摘要

Energy demand is growing and our society faces a challenge to find sustainable sources with minimal environmental impact. Existing technologies such as solar, wind and geothermal have been deployed and effort to improve their physical and cost effectiveness is ongoing. Another source of renewable energy available which has not been harvested to its full potential so far is "waste" heat. It arises from a variety of sources, from household boiler to large scale power plant, and a striking example is the conventional combustion engine in which 60 % of the energy produced is lost in the form of heat. The possibility to design a semiconductor device made of p-n junctions which when exposed to a temperature gradient will output electrical power is an attractive solution for the automotive industry to improve fuel efficiency, lower the carbon foot print and end-user costs. This device, called a thermoelectric generator has been successfully used for aero-spatial application or in its converse form as Peltier cooler, contributes to all component of the energy trilemma. The major barrier for a widespread dissemination of this technology as energy harvester is the high raw material costs and a lack of material for high temperature operation.This research will investigate new classes of inorganic oxide composed of earth abundant elements presenting electrical and thermal properties suitable for integration in a high temperature thermoelectric generator. Efficient thermoelectric materials possess high electrical conductivity and low thermal conductivity which, in a standard semiconductor picture, are antagonistic properties. Focusing on the high temperature spectrum, oxides materials will display the chemical stability required for the device to function reliably. Since the majority of these materials are electrically insulating, the concept is based on identifying structure patterns that have hidden electronic lattice which could act as conducting channel. Similar concept has been successfully applied on layered oxides where only competitive p-type thermoelectric materials where produced. The project aims to explore the possibility to use the strong correlation between electronic, thermal and magnetic lattice to circumvent the limitations encountered in this class of materials and expand our understanding of this complex compounds.A specific objective of the project is to prepare poly- and single crystalline layered oxides derived from the trirutile structure, measure the high temperature conductivity and thermopower and optimise the thermoelectric property using chemical doping to obtain both p and n type compounds. The layered structures of the proposed compounds are conducive to exotic magnetic properties and more complex phenomena such as Nernst-Ettinghausen effect and spin Seebeck effect will be investigated.

能源需求正在增长，我们的社会面临着寻找对环境影响最小的可持续能源的挑战。已经部署了太阳能、风能和地热等现有技术，并正在努力提高其物理和成本效益。到目前为止，另一种可用的可再生能源尚未充分利用，那就是“废热”。它来自各种来源，从家用锅炉到大型发电厂，一个明显的例子是传统的内燃机，其产生的能量有60%以热的形式损失。设计一种由p-n结组成的半导体器件的可能性，当暴露在温度梯度下时，将输出电能，这对汽车行业来说是一个有吸引力的解决方案，以提高燃料效率，降低碳足迹和最终用户成本。这种被称为热电发电机的装置已经成功地用于航空空间应用，或以相反的形式作为帕尔蒂埃冷却器，贡献了能量三元组的所有组成部分。作为能源收集器，这项技术广泛推广的主要障碍是高昂的原材料成本和高温运行所需材料的缺乏。这项研究将研究由丰富的稀土元素组成的新型无机氧化物，这些元素具有电和热性能，适合集成到高温热电发电机中。高效的热电材料具有高导电性和低导热性，在标准的半导体图像中，这两种特性是相互对立的。以高温光谱为重点，氧化物材料将显示设备可靠运行所需的化学稳定性。由于这些材料中的大多数都是电绝缘的，所以这个概念是基于识别具有隐藏的电子晶格的结构模式，这些电子晶格可以充当导电通道。类似的概念已经成功地应用于只生产具有竞争力的p型热电材料的层状氧化物上。该项目旨在探索利用电子、热和磁晶格之间的强相关性来绕过这类材料所遇到的限制并扩大我们对这种复杂化合物的理解的可能性。该项目的一个具体目标是制备由三金红石结构衍生的多晶层状和单晶层状氧化物，测量高温导电性和热电性，并通过化学掺杂来优化热电性能，以获得p型和n型化合物。所提出的化合物的层状结构有利于奇异的磁性，并将研究更复杂的现象，如Nernst-Ettinghausen效应和自旋Seebeck效应。