转换器
制作
能量转换效率
能量转换
材料科学
热电效应
余热
烧结
工作(物理)
高效能源利用
热电材料
电子工程
电气工程
机械工程
光电子学
电压
冶金
工程类
复合材料
热力学
物理
热导率
医学
替代医学
热交换器
病理
作者
Mykola Maksymuk,Taras Parashchuk,A. Burbelko,K. Wojciechowski
标识
DOI:10.1016/j.cej.2023.144899
摘要
Due to industrial activity, an enormous amount of heat is wasted on the environment enabling energy loss and global warming. Thermoelectric (TE) technologies make possible the direct conversion of waste heat into electrical energy. The main bottlenecks of energy conversion by TE devices are low efficiency as well as the expensive and complex fabrication procedure of industrial converters. In this work, we fabricated a Bi2Te3-based TE converter with stepwise legs for highly efficient energy conversion using a single-step sintering method. Before the fabrication of the converter, we employed the numerical simulation and found that Co is the best choice among the other well-established metallic layers, that can be used for the highly conductive covering of the n- and p-type TE legs. The employment of this metal produces the lowest thermal stress that occurs in the stepwise converter at the cooling stage of a sintering process. The energy conversion efficiency of the designed converter estimated using the finite element method reaches 10.1% at a temperature difference of 375 K (Tc = 300 K). Moreover, the measured value of efficiency achieves 8.5%, which is 1.4 times higher than the commercial Bi2Te3-based converters and 9–14% higher than the other reported stepwise converters. The enhanced efficiency mainly originates from the effective stepwise design of the n- and p-type TE legs. This work offers a new path for the simple single-step fabrication of the Bi2Te3-based TE converters that should have great potential for energy harvesting.
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