基于醇/水体系的水凝胶热电材料制备及其热电性能强化的研究  

Fabrication of hydrogel thermoelectric materials based on alcohol/water system and enhancement of their thermoelectric performance

作　　者：李平凡 胡庭瑗 潘大伟 汪伟[1] LI Ping-fan;HU Ting-yuan;PAN Da-wei;WANG Wei(School of Chemical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学化学工程学院,四川成都610065

出　　处：《现代化工》2023年第3期72-77,共6页Modern Chemical Industry

基　　金：国家自然科学基金(21922809)。

摘　　要：将含有[Fe(CN)_(6)]^(4-)/[Fe(CN)_(6)]^(3-)的醇/水溶液与聚丙烯酰胺水凝胶材料相结合,构建了具有优良热电性能的水凝胶热电材料。该水凝胶热电材料中醇的引入可调控其高分子网络内氧化还原离子对的溶剂化壳层和溶解特性,从而实现热电性能强化。系统研究了甘油、丙二醇、乙醇对水凝胶热电材料的抗压性能和热电性能的影响。结果表明,相比于甘油和丙二醇,当引入乙醇时该水凝胶热电材料展现出最高的抗压强度(0.18 MPa),且在压缩至80%之后可完全回复;同时,引入乙醇的水凝胶热电材料在10℃温差时的塞贝克系数可达2.19 mV/K,其标准化功率密度为0.36 mW/(m^(2)·K^(2)),展现出优良的热电转化性能。Hydrogel-based thermoelectric materials with excellent thermoelectric performance are developed by integrating polyacrylamide hydrogel with alcohol/water solution containing [Fe(CN)_(6)]^(4-)/[Fe(CN)_(6)]^(3-).The addition of alcohol in hydrogel thermoelectric materials makes adjustable the solvation shell and dissolution property of the redox ion pairs in the polymeric networks, therefore enhancing the thermoelectric performance.The effects of glycerol, propylene glycol, and ethanol on the compressibility and thermoelectric performance of hydrogel thermoelectric materials are systematically studied.It is found that compared to glycerol and propylene glycol, the hydrogel thermoelectric material added with ethanol exhibits the highest compressive strength(0.18 MPa),and allows nearly full recovery after 80% compression.Meanwhile, the ethanol-containing hydrogel thermoelectric material can achieve a high Seebeck coefficient of 2.19 mV·K^(-1)at a temperature difference of 10oC,and a normalized power density of 0.36 mW/(m^(2)·K^(2)),indicating an excellent thermoelectric performance.

关 键 词：水凝胶 热电转换 氧化还原反应 塞贝克系数 

分 类 号：TQ317[化学工程—高聚物工业]