https://scholars.lib.ntu.edu.tw/handle/123456789/640280
標題: | A pH-Sensitive Stretchable Zwitterionic Hydrogel with Bipolar Thermoelectricity | 作者: | Lee, Ling Chieh Huang, Kang Ting Lin, Yen-Ting Jeng, U. Ser Wang, Chia Hsin SHIH-HUANG TUNG Huang, Chun Jen CHENG-LIANG LIU |
關鍵字: | hydrogel | ionic Seebeck coefficient | ionic thermoelectrics | low-grade heat harvesting | zwitterionic polymer | 公開日期: | 1-一月-2024 | 來源出版物: | Small | 摘要: | Amid growing interest in using body heat for electricity in wearables, creating stretchable devices poses a major challenge. Herein, a hydrogel composed of two core constituents, namely the negatively-charged 2-acrylamido-2-methylpropanesulfonic acid and the zwitterionic (ZI) sulfobetaine acrylamide, is engineered into a double-network hydrogel. This results in a significant enhancement in mechanical properties, with tensile stress and strain of up to 470.3 kPa and 106.6%, respectively. Moreover, the ZI nature of the polymer enables the fabrication of a device with polar thermoelectric properties by modulating the pH. Thus, the ionic Seebeck coefficient (Si) of the ZI hydrogel ranges from −32.6 to 31.7 mV K−1 as the pH is varied from 1 to 14, giving substantial figure of merit (ZTi) values of 3.8 and 3.6, respectively. Moreover, a prototype stretchable ionic thermoelectric supercapacitor incorporating the ZI hydrogel exhibits notable power densities of 1.8 and 0.9 mW m−2 at pH 1 and 14, respectively. Thus, the present work paves the way for the utilization of pH-sensitive, stretchable ZI hydrogels for thermoelectric applications, with a specific focus on harvesting low-grade waste heat within the temperature range of 25–40 °C. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/640280 | ISSN: | 16136810 | DOI: | 10.1002/smll.202311811 |
顯示於: | 材料科學與工程學系 |
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