Implication of nanostructuring of bulk nanocomposite Ti9Ni7Sn8 on the optimization of high thermoelectric performance

IF 3.6 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Materials for Renewable and Sustainable Energy Pub Date : 2020-06-06 DOI:10.1007/s40243-020-00172-8

Ashish Kumar, K. M. Chaturvedi, A. Bhardwaj, Bal Govind, Sahiba Bano, D. K. Misra

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引用次数: 7

Abstract

Nanostructuring approach on TiNiSn-based half-Heusler (HH) thermoelectric materials (TE) has been well established as the most prominent paradigm for achieving high figure of merit (ZT). Herein, we have extended this approach on our previously reported bulk nanocomposite (BNC), containing HH and Full Heusler (FH) with little traces of Ti₆Sn₅ phase in a stoichiometric composition Ti₉Ni₇Sn₈ for the optimization of high thermoelectric performance. A synergistic effect of nanostructuring of Ti₉Ni₇Sn₈ bulk nanocomposite (BNC) on its thermoelectric properties was noticed, revealing an enhanced value of ZT?~?0.83 at 773?K. This enhancement in ZT value is mainly ascribed to significant reduction in thermal conductivity (κ?~?1.0?W/mK at 773?K), through modification in grain as well as phase boundary scattering. The marginal enhancement in Seebeck coefficient observed is attributed to charge carrier filtering effect at the interface of HH/FH phases.

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块状纳米复合材料Ti9Ni7Sn8的纳米结构对优化高热电性能的意义

基于tinnis的半赫斯勒(HH)热电材料(TE)的纳米结构方法已经被确立为实现高品质系数(ZT)的最突出范例。在这里，我们将这种方法扩展到我们之前报道的大块纳米复合材料(BNC)上，该复合材料含有HH和Full Heusler (FH)，在Ti9Ni7Sn8的化学计量成分中几乎没有Ti6Sn5相的痕迹，以优化高热电性能。纳米结构对Ti9Ni7Sn8块体纳米复合材料(BNC)的热电性能有协同效应，在773 K时ZT ~ 0.83值增强。ZT值的增加主要是由于导热系数(κ?~?1.0?)的显著降低。W/mK (773?K)，通过晶粒的变质和相界散射。塞贝克系数的边际增强归因于HH/FH相界面处的载流子滤波效应。

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来源期刊

Materials for Renewable and Sustainable Energy MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

7.90

自引率

2.20%

发文量

审稿时长

13 weeks

期刊介绍： Energy is the single most valuable resource for human activity and the basis for all human progress. Materials play a key role in enabling technologies that can offer promising solutions to achieve renewable and sustainable energy pathways for the future. Materials for Renewable and Sustainable Energy has been established to be the world''s foremost interdisciplinary forum for publication of research on all aspects of the study of materials for the deployment of renewable and sustainable energy technologies. The journal covers experimental and theoretical aspects of materials and prototype devices for sustainable energy conversion, storage, and saving, together with materials needed for renewable fuel production. It publishes reviews, original research articles, rapid communications, and perspectives. All manuscripts are peer-reviewed for scientific quality. Topics include: 1. MATERIALS for renewable energy storage and conversion: Batteries, Supercapacitors, Fuel cells, Hydrogen storage, and Photovoltaics and solar cells. 2. MATERIALS for renewable and sustainable fuel production: Hydrogen production and fuel generation from renewables (catalysis), Solar-driven reactions to hydrogen and fuels from renewables (photocatalysis), Biofuels, and Carbon dioxide sequestration and conversion. 3. MATERIALS for energy saving: Thermoelectrics, Novel illumination sources for efficient lighting, and Energy saving in buildings. 4. MATERIALS modeling and theoretical aspects. 5. Advanced characterization techniques of MATERIALS Materials for Renewable and Sustainable Energy is committed to upholding the integrity of the scientific record. As a member of the Committee on Publication Ethics (COPE) the journal will follow the COPE guidelines on how to deal with potential acts of misconduct. Authors should refrain from misrepresenting research results which could damage the trust in the journal and ultimately the entire scientific endeavor. Maintaining integrity of the research and its presentation can be achieved by following the rules of good scientific practice as detailed here: https://www.springer.com/us/editorial-policies