Monolithic Bi1.5Sb0.5Te3 ternary alloys with a periodic 3D nanostructure for enhancing thermoelectric performance,Journal of Materials Chemistry C

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Monolithic Bi1.5Sb0.5Te3 ternary alloys with a periodic 3D nanostructure for enhancing thermoelectric performance
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-07-28 00:00:00 , DOI: 10.1039/c7tc02717f
Seokkyoon Hong _{1,

2,

3,

4,

5} , Junyong Park _{1,

2,

3,

4,

5} , Seong Gi Jeon _{1,

2,

3,

4,

5} , Kisun Kim _{1,

2,

3,

4,

5} , Sun Hwa Park _{6,

7,

8,

9} , Ho Sun Shin _{6,

7,

8,

9} , Bumsoo Kim _{1,

2,

3,

4,

5} , Seokwoo Jeon _{1,

2,

3,

4,

5} , Jae Yong Song _{6,

7,

8,

9}

Affiliation

The selective reduction of thermal conductivity while preserving the Seebeck coefficient and electrical conductivity is regarded as a key strategy for achieving the high dimensionless figure-of-merit (ZT) of thermoelectric materials. Here, we newly propose a periodic three-dimensional (3D) nanostructure that has an ability to significantly reduce thermal conductivity, resulting in an improved ZT value of thermoelectric materials near room temperature. A 3D nanostructured thermoelectric monolith is developed by electrochemical deposition of a Bi–Sb–Te ternary alloy into a highly ordered, interstitial porous network in an epoxy template predefined by advanced lithography. The resultant inch-scale, bicontinuous nanocomposite monolith released from a substrate can be easily transferred to a customized reliable platform for evaluating thermoelectric properties. The measured thermal conductivity is only ∼0.89 W mK⁻¹ at 350 K due to greatly increased phonon boundary scattering without any degradation in the Seebeck coefficient and electrical conductivity, leading to an enhanced ZT value (∼0.56) which is ∼50% higher than that of an ordinary film with the same elemental composition. The 3D nanostructure developed here will provide new design opportunities for nanostructured thermoelectric materials, potentially usable in flexible thermoelectric coolers and wearable energy harvesting systems.

中文翻译：

具有周期性3D纳米结构的单片Bi _1.5 Sb _0.5 Te ₃三元合金，可增强热电性能

在保持塞贝克系数和电导率的同时选择性降低热导率被视为实现热电材料的高无量纲品质因数（ZT）的关键策略。在这里，我们新提出了一种周期性的三维（3D）纳米结构，该结构具有显着降低热导率的能力，从而改善了ZT接近室温的热电材料的价值。通过将Bi-Sb-Te三元合金电化学沉积到由高级光刻术预先定义的环氧树脂模板中的高度有序的间隙多孔网络中，可以开发出3D纳米结构的热电整体结构。从基板释放的所得英寸级双连续纳米复合材料整料可轻松转移至定制的可靠平台，以评估热电性能。由于声子边界散射大大增加，而塞贝克系数和电导率没有任何下降，因此在350 K下测得的热导率仅为〜0.89 W mK ^-1，从而导致ZT增强该值（〜0.56）比具有相同元素组成的普通膜的值高〜50％。此处开发的3D纳米结构将为纳米结构的热电材料提供新的设计机会，它们可能会用在柔性热电冷却器和可穿戴式能量收集系统中。

更新日期：2017-09-14

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