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Near-Room-Temperature Thermoelectric Performance Enhancement Via Phonon Spectra Mismatch in Mg3(Sb, Bi)2-Based Material by Incorporating Multi-Walled Carbon Nanotubes
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-05-24 , DOI: 10.1002/aenm.202301107 Zhongxin Liang 1 , Congcong Xu 1 , Hongjing Shang 2 , Minghui Ning 1 , Tian Tong 3 , Shaowei Song 1 , Wuyang Ren 1 , Xin Shi 1 , Xiu Liu 4 , Fazhu Ding 2 , Jiming Bao 3 , Dezhi Wang 1 , Zhifeng Ren 1
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2023-05-24 , DOI: 10.1002/aenm.202301107 Zhongxin Liang 1 , Congcong Xu 1 , Hongjing Shang 2 , Minghui Ning 1 , Tian Tong 3 , Shaowei Song 1 , Wuyang Ren 1 , Xin Shi 1 , Xiu Liu 4 , Fazhu Ding 2 , Jiming Bao 3 , Dezhi Wang 1 , Zhifeng Ren 1
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Although a high figure of merit (zT) over a wide range of temperatures has been shown in n-type Zintl Mg3(Sb, Bi)2, further improvement of its near-room-temperature performance is still required to promote its application in next-generation thermoelectric coolers and power generators. Here, a novel strategy of phonon spectra mismatch for enhancing the thermoelectric performance of Mg3(Sb, Bi)2 is reported by incorporating multi-walled carbon nanotubes (MWCNT). The introduction of very small amounts of MWCNT generates a large interfacial thermal resistance and thus significantly reduces the lattice thermal conductivity of the resulting composites, while maintaining a high power factor. As a result, a zT of ≈1.5 at 573 K and an average zT of 1.14 between 323 and 573 K can be achieved in the 0.5 wt% MWCNT composite. Moreover, a high conversion efficiency of ≈8.1% under a temperature difference of 283 K is realized in a resulting single-leg device, making it a promising candidate material for low-grade heat recovery. This study provides not only a material with a high near-room-temperature zT but also a unique insight into the design of high-performance thermoelectric materials via compositing to exploit the large difference in phonon spectra between the components of the composite.
中文翻译：
通过掺入多壁碳纳米管在 Mg3(Sb, Bi)2 基材料中通过声子光谱失配增强近室温热电性能
尽管n型Zintl Mg 3 (Sb, Bi) 2在较宽的温度范围内表现出高品质因数( zT ) ，但仍需要进一步改进其近室温性能以促进其在工业领域的应用。下一代热电冷却器和发电机。在此，报道了一种通过掺入多壁碳纳米管（MWCNT）来增强Mg 3 (Sb, Bi) 2热电性能的声子光谱失配的新策略。引入极少量的多壁碳纳米管会产生较大的界面热阻，从而显着降低所得复合材料的晶格热导率，同时保持高功率因数。结果，一个0.5 wt% MWCNT 复合材料在 573 K 时的zT约为 1.5，在 323 至 573 K 之间的平均zT为 1.14。此外，在283 K的温差下，所得到的单腿器件实现了约8.1%的高转换效率，使其成为低级热回收的有前途的候选材料。这项研究不仅提供了一种具有高近室温zT的材料，而且还为通过复合来利用复合材料成分之间声子光谱的巨大差异来设计高性能热电材料提供了独特的见解。
更新日期：2023-05-24
中文翻译：
通过掺入多壁碳纳米管在 Mg3(Sb, Bi)2 基材料中通过声子光谱失配增强近室温热电性能
尽管n型Zintl Mg 3 (Sb, Bi) 2在较宽的温度范围内表现出高品质因数( zT ) ，但仍需要进一步改进其近室温性能以促进其在工业领域的应用。下一代热电冷却器和发电机。在此，报道了一种通过掺入多壁碳纳米管（MWCNT）来增强Mg 3 (Sb, Bi) 2热电性能的声子光谱失配的新策略。引入极少量的多壁碳纳米管会产生较大的界面热阻，从而显着降低所得复合材料的晶格热导率，同时保持高功率因数。结果，一个0.5 wt% MWCNT 复合材料在 573 K 时的zT约为 1.5，在 323 至 573 K 之间的平均zT为 1.14。此外，在283 K的温差下，所得到的单腿器件实现了约8.1%的高转换效率，使其成为低级热回收的有前途的候选材料。这项研究不仅提供了一种具有高近室温zT的材料，而且还为通过复合来利用复合材料成分之间声子光谱的巨大差异来设计高性能热电材料提供了独特的见解。
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