Zhe Yang , Xiaolu Li , Shuocheng Sun , Shuai Fu , Qiang Huang , Pengli He , Huijie Zhu , Yachen Li , Jing Li , Botong Li , Yilun Liu , Wei Zhao
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However, many factors, such as electrode materials, electrolyte solutions, and energy conversion device components, determine the efficiency of a thermoelectric conversion device. In summary, the device has a lower internal resistance and higher output voltage when the concentration of KCl solution is 0.05 M, and demonstrates higher thermoelectric conversion efficiency. Moreover, improving the conductivity of the electrolyte solution without affecting the device output voltage is also a way to reduce the internal power consumption of the device. The specific power and thermoelectric conversion efficiency of the device are increased by several orders of magnitude when uniformly dispersed silver nanoparticles are added to the potassium chloride solution to enhance the conductivity of the solution. The specific power underwent an increase from 0.50 mW g<sup>−1</sup> to 42.37 mW g<sup>−1</sup>, and the thermoelectric conversion efficiency also increased from 0.0022% to 0.1358%.</p></div>","PeriodicalId":17219,"journal":{"name":"Journal of Science: Advanced Materials and Devices","volume":"9 2","pages":"Article 100702"},"PeriodicalIF":6.7000,"publicationDate":"2024-03-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2468217924000339/pdfft?md5=dd74365fddb9cea5a043c8c646f7e861&pid=1-s2.0-S2468217924000339-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Low-grade heat recycling of vertical thermoelectric cells based on thermal-induced electric double layer\",\"authors\":\"Zhe Yang , Xiaolu Li , Shuocheng Sun , Shuai Fu , Qiang Huang , Pengli He , Huijie Zhu , Yachen Li , Jing Li , Botong Li , Yilun Liu , Wei Zhao\",\"doi\":\"10.1016/j.jsamd.2024.100702\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Employing electric double-layer (EDL) capacitors to harvest low-grade heat (LGH) is a novel technique in the high-efficiency energy absorption field. 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引用次数: 0
摘要
利用双电层(EDL)电容器收集低品位热量(LGH)是高效能量吸收领域的一项新技术。这项研究报告了一种垂直热电电池的制作方法,该电池基于浸入低浓度盐水溶液中的纳米多孔石墨烯电极,可用作热充电超级电容器,通过热感应电压将低品位热量转化为电能。由于纳米多孔石墨烯薄膜的比面积大、微孔数量多,因此含有 0.01 M KCl 溶液的热电池的有效热电系数可高达 4.73 mV/°C。然而,电极材料、电解质溶液和能量转换装置组件等诸多因素决定了热电转换装置的效率。总之,当 KCl 溶液的浓度为 0.05 M 时,该装置的内阻较低,输出电压较高,热电转换效率较高。此外,在不影响装置输出电压的情况下,提高电解质溶液的电导率也是降低装置内部功耗的一种方法。在氯化钾溶液中加入均匀分散的银纳米粒子以提高溶液的导电性时,装置的比功率和热电转换效率提高了几个数量级。比功率从 0.50 mW g 增加到 42.37 mW g,热电转换效率也从 0.0022% 增加到 0.1358%。
Low-grade heat recycling of vertical thermoelectric cells based on thermal-induced electric double layer
Employing electric double-layer (EDL) capacitors to harvest low-grade heat (LGH) is a novel technique in the high-efficiency energy absorption field. This work reports the fabrication of a vertical thermoelectric cell, based on a nanoporous graphene electrode immersed in low-concentration saline solution, for use as thermo-charging supercapacitors to convert LGH to electricity via thermally induced voltage. Because of a large specific area and a large number of micropores of nanoporous graphene films, the effective thermoelectric coefficient of the thermoelectric cell containing 0.01 M KCl solution can reach as high as 4.73 mV/°C. However, many factors, such as electrode materials, electrolyte solutions, and energy conversion device components, determine the efficiency of a thermoelectric conversion device. In summary, the device has a lower internal resistance and higher output voltage when the concentration of KCl solution is 0.05 M, and demonstrates higher thermoelectric conversion efficiency. Moreover, improving the conductivity of the electrolyte solution without affecting the device output voltage is also a way to reduce the internal power consumption of the device. The specific power and thermoelectric conversion efficiency of the device are increased by several orders of magnitude when uniformly dispersed silver nanoparticles are added to the potassium chloride solution to enhance the conductivity of the solution. The specific power underwent an increase from 0.50 mW g−1 to 42.37 mW g−1, and the thermoelectric conversion efficiency also increased from 0.0022% to 0.1358%.
期刊介绍:
In 1985, the Journal of Science was founded as a platform for publishing national and international research papers across various disciplines, including natural sciences, technology, social sciences, and humanities. Over the years, the journal has experienced remarkable growth in terms of quality, size, and scope. Today, it encompasses a diverse range of publications dedicated to academic research.
Considering the rapid expansion of materials science, we are pleased to introduce the Journal of Science: Advanced Materials and Devices. This new addition to our journal series offers researchers an exciting opportunity to publish their work on all aspects of materials science and technology within the esteemed Journal of Science.
With this development, we aim to revolutionize the way research in materials science is expressed and organized, further strengthening our commitment to promoting outstanding research across various scientific and technological fields.