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首页> 外文期刊>Advanced energy materials >High-Efficiency Thermoelectric Power Generation Enabled by Homogeneous Incorporation of MXene in (Bi,Sb)_2Te_3 Matrix
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High-Efficiency Thermoelectric Power Generation Enabled by Homogeneous Incorporation of MXene in (Bi,Sb)_2Te_3 Matrix

机译：（Bi，Sb）_2Te_3基体中MXene的均相掺入可实现高效热电发电

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摘要

The (Bi,Sb)(2)Te-3 (BST) compounds have long been considered as the benchmark of thermoelectric (TE) materials near room temperature especially for refrigeration. However, their unsatisfactory TE performances in wide-temperature range severely restrict the large-scale applications for power generation. Here, using a self-assembly protocol to deliver a homogeneous dispersion of 2D inclusion in matrix, the first evidence is shown that incorporation of MXene (Ti3C2Tx) into BST can simultaneously achieve the improved power factor and greatly reduced thermal conductivity. The oxygen-terminated Ti3C2Tx with proper work function leads to highly increased electrical conductivity via hole injection and retained Seebeck coefficient due to the energy barrier scattering. Meanwhile, the alignment of Ti3C2Tx with the layered structure significantly suppresses the phonon transport, resulting in higher interfacial thermal resistance. Accordingly, a peak ZT of up to 1.3 and an average ZT value of 1.23 from 300 to 475 K are realized for the 1 vol% Ti3C2Tx/BST composite. Combined with the high-performance composite and rational device design, a record-high thermoelectric conversion efficiency of up to 7.8% is obtained under a temperature gradient of 237 K. These findings provide a robust and scalable protocol to incorporate MXene as a versatile 2D inclusion for improving the overall performance of TE materials toward high energy-conversion efficiency.
机译：（Bi，Sb）（2）Te-3（BST）化合物长期以来一直被视为接近室温的热电（TE）材料的基准，特别是用于制冷。然而，它们在宽温度范围内的令人满意的TE性能严重地限制了大规模的发电应用。在这里，使用自组装协议将2D夹杂物均匀分散在基质中，第一个证据表明，将MXene（Ti3C2Tx）掺入BST可以同时提高功率因数并大大降低热导率。具有适当功函数的氧封端的Ti3C2Tx可通过空穴注入大大提高电导率，并由于能垒散射而保持塞贝克系数。同时，Ti3C2Tx与层状结构的排列显着抑制了声子的传输，从而导致更高的界面热阻。因此，对于1vol％的Ti 3 C 2 Tx / BST复合材料，实现了从1.3到300K的高达1.3的峰值ZT和1.23的平均ZT值。结合高性能复合材料和合理的设备设计，在237 K的温度梯度下，热电转换效率达到了创纪录的7.8％。这些发现为将MXene作为通用的2D包含物提供了强大而可扩展的协议用于提高TE材料的整体性能，以实现高能量转换效率。

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  • 来源
    《Advanced energy materials》 |2020年第2期|1902986.1-1902986.11|共11页
  • 作者

    Lu Xiaofang; Zhang Qihao; Liao Jincheng; Chen Hongyi; Fan Yuchi; Xing Juanjuan; Gu Shijia; Huang Jilong; Ma Jiaxin; Wang Jiancheng; Wang Lianjun; Jiang Wan;

  • 作者单位

    Donghua Univ State Key Lab Modificat Chem Fibers & Polymer Mat Shanghai 201620 Peoples R China|Donghua Univ Coll Mat Sci & Engn Shanghai 201620 Peoples R China;

    Chinese Acad Sci Shanghai Inst Ceram State Key Lab High Performance Ceram & Superfine Shanghai 200050 Peoples R China|Univ Chinese Acad Sci Ctr Mat Sci & Optoelect Engn Beijing 100049 Peoples R China;

    Chinese Acad Sci Shanghai Inst Ceram State Key Lab High Performance Ceram & Superfine Shanghai 200050 Peoples R China;

    Cent S Univ Coll Chem & Chem Engn Changsha 410083 Hunan Peoples R China;

    Donghua Univ State Key Lab Modificat Chem Fibers & Polymer Mat Shanghai 201620 Peoples R China|Donghua Univ Coll Mat Sci & Engn Shanghai 201620 Peoples R China|Donghua Univ Inst Funct Mat Shanghai 201620 Peoples R China;

    Shanghai Univ Sch Mat Sci & Engn Mat Genome Inst Shanghai 200444 Peoples R China;

    Donghua Univ Inst Funct Mat Shanghai 201620 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    bismuth telluride-based composites; high-efficiency; MXene; self-assembly; thermoelectric power generation;

    机译：碲化铋基复合材料;高效率;MXene;自组装;热电发电;

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