无机材料学报 ›› 2016, Vol. 31 ›› Issue (11): 1249-1254.DOI: 10.15541/jim20160118

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聚对苯撑纳米复合提升ZnO基热电材料性能

吴子华, 谢华清, 王元元, 毛建辉, 邢姣娇, 李奕怀   

  1. (上海第二工业大学 工学部环境与材料工程学院, 上海 201209)
  • 收稿日期:2016-03-03 修回日期:2016-04-21 出版日期:2016-11-10 网络出版日期:2016-10-25
  • 作者简介:吴子华(1978–), 男, 副教授. E-mail: wuzihua@ sspu.edu.cn
  • 基金资助:
    国家自然科学基金(51590902, 51476095);上海市青年东方学者岗位支持计划(QD2015052)

PPP Addition to Improve Thermoelectric Properties of ZnO-based Thermoelectric Composites

WU Zi-Hua, XIE Hua-Qing, WANG Yuan-Yuan, MAO Jian-Hui, XING Jiao-Jiao, LI Yi-Huai   

  1. (School of Environment and Materials Engineering, College of Engineering, Shanghai Polytechnic University, Shanghai, 201209, China)
  • Received:2016-03-03 Revised:2016-04-21 Published:2016-11-10 Online:2016-10-25
  • About author:WU Zi-Hua. E-mail: wuzihua@ sspu.edu.cn
  • Supported by:
    National Science Foundation of China(51590902, 51476095), Program for Professor of Special Appointment (Young Eastern Scholar, QD2015052) at Shanghai Institutions of Higher Learning

摘要:

以溶胶-凝胶法合成了PPP@Zn1-xCoxO纳米复合热电材料(x=0, 0.025), 再以放电等离子烧结制备成块体, 并对其热电性能进行了研究。由透射电镜照片发现, PPP纳米颗粒尺寸在200 nm以下。热电性能分析表明, 随着PPP添加量的增加, 赛贝克系数先增大后减小。电导率随PPP含量增加而大幅度提高。与ZnO块体材料相比, 溶胶-凝胶法合成的PPP@Zn1-xCoxO纳米复合热电材料的热导率大幅度降低, 在640 K时, 9wt% PPP的纳米复合热电材料热导率降低至5.4 W/(m·K)。电导率的增加和热导率的降低, 导致热电性能大幅度提高, 9wt%PPP@Zn0.975Co0.025O纳米复合热电材料在870 K时具有最大ZT值(0.16), 是Zn0.975Co0.025O材料的8倍。

关键词: ZnO, 热电性能, 溶胶-凝胶, 分子结

Abstract:

PPP@Zn1-xCoxO (x=0, 0.025) nanocomposites were prepared by Sol-Gel method, then bulk samples were prepared by spark plasma sintering. And thermoelectric properties of the samples were studied. Transmission electron microscopy (TEM) observations indicate that PPP nanoparticles are smaller than 200 nm. With the increase of PPP content, Seebeck coefficient gradually increases at first and then decreases, while electric conductivity increases quickly. Compared with ZnO bulk samples, the thermal conductivity of PPP@Zn1-xCoxO nanocomposite is decreased. The thermal conductivity of 9wt% PPP@Zn0.975Co0.025O is decreased to 5.4 W/(m·K) at 640 K. The increase of electrical conductivity and the decrease of thermal conductivity resulted in a great increase in the value of thermoelectric properties. 9wt% PPP@Zn0.975Co0.025O has a maximal ZT value of 0.16 at 870 K, which is 8 times of that of Zn0.975Co0.025O bulk material.

Key words: ZnO, thermoelectric property, Sol-Gel, molecular junction

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