Materials Today Sustainability ( IF 7.1 ) Pub Date : 2022-12-12 , DOI: 10.1016/j.mtsust.2022.100293
Ziquan Zhou , Yanfen Wan , Jinyu Zi , Goumin Ye , Taosha Jin , Xuemin Geng , Wenbo Zhuang , Peng Yang
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Harvesting abundant and ubiquitous low-grade thermal energy and simultaneously converting it into electrical energy hold the potential of solving the existing energy crisis. Advances in thermoelectric materials now allow thermoelectric ionogel electrolyte to enhance the energy conversion and storage capacities under a thermal gradient. Here, we report an ionic thermoelectric (i-TE) material based on polyacrylamide (PAM) carboxymethyl cellulose (CMC) double network gel substrate with flexible and high thermal-electrical conversion properties. By combining the thermodiffusion effect of lithium sulfate (Li2SO4) ions and the thermogalvanic effect of [Fe(CN)64−/Fe(CN)63−], which achieved a coupled ionic Seebeck effect of up to 11.58 mV/K, exhibiting a high ionic conductivity (18.4 mS cm−1) and low thermal conductivity (0.47 W m−1/K), resulting in a high ionic power factor (198.2 μW m−1K−2) at room temperature. It exhibited an excellent tensile property (634%) and adhesion, and avoids electrolyte leakage to a large extent. Moreover, the application in ionic capacitors also demonstrates the superior thermoelectric conversion capability of i-TE gels. We believe that i-TE materials will pave a new pathway for low-grade thermal harvesting and self-driven flexible wearable electronics.
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具有耦合增强热电效应的柔性水凝胶用于低级热收集
收集丰富且无处不在的低品位热能,同时将其转化为电能,具有解决现有能源危机的潜力。热电材料的进步现在允许热电离子凝胶电解质在热梯度下增强能量转换和存储能力。在这里,我们报告了一种基于聚丙烯酰胺 (PAM) 羧甲基纤维素 (CMC) 双网络凝胶基底的离子热电 (i-TE) 材料,具有柔性和高热电转换性能。通过结合硫酸锂 (Li 2 SO 4 ) 离子的热扩散效应和 [Fe(CN) 6 4− /Fe(CN) 6 3−],它实现了高达 11.58 mV/K 的耦合离子塞贝克效应,表现出高离子电导率 (18.4 mS cm -1 ) 和低热导率 (0.47 W m -1 /K),从而产生高离子功率因数(198.2 μW m -1 K -2 ) 在室温下。它表现出优异的拉伸性能(634%)和附着力,并在很大程度上避免了电解液泄漏。此外,在离子电容器中的应用也证明了i-TE凝胶优异的热电转换能力。我们相信,i-TE 材料将为低品位热收集和自驱动柔性可穿戴电子产品开辟一条新途径。