The (Bi,Sb)₂Te₃ (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 (Ti₃C₂T_x) into BST can simultaneously achieve the improved power factor and greatly reduced thermal conductivity. The oxygen‐terminated Ti₃C₂T_x 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 Ti₃C₂T_x 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% Ti₃C₂T_x/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.

中文翻译：

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通过在（Bi，Sb）2Te3基质中均匀掺入MXene来实现高效热电发电

（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。但是，它们在宽温度范围内的令人满意的TE性能严重限制了大规模发电应用。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（Ti ₃ C ₂ T _x）掺入BST可以同时实现改善的功率因数和大大降低的热导率。氧封端的Ti ₃ C ₂ T _x具有适当功函数的材料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，Ti ₃ C ₂ T _x与层状结构的取向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 T _x，实现了最高ZT高达1.3，平均ZT值从300到475 K为1.23。/ BST复合。结合高性能复合材料和合理的器件设计，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。