Song Yating, Niu Li, Ma Peilin, Li Xu, Feng Jacko, Liu Zhiming
College of Material Science and Engineering, Northeast Forestry University, Harbin 150040, P. R. China.
AEMG Academy, Melbourne 3127, Australia.
ACS Appl Mater Interfaces. 2023 Feb 10. doi: 10.1021/acsami.2c21617.
Conductive hydrogels have shown great promise in flexible electronics, but their practical applications may be impeded by the time-consuming and energy-consuming polymerization process. We proposed a sodium lignosulfonate-Fe (SLS-Fe) strategy to address this challenge and took advantage of carboxymethyl cellulose (CMC) and poly(acrylic acid) to prepare the CMC/PAA/Fe/LiCl interpenetrating conductive hydrogels with good self-healing properties, antifreezing properties, and a 6-fold increase in conductivity in this study. The hydrogel-based flexible strain sensors demonstrated a broad detection range (400%), high sensitivity (GF = 6.19 at 200-400%), and human motion detection capability. The hydrogel-based supercapacitor exhibited a single-electrode specific capacitance of 122.36 F g which successfully powered LEDs. Furthermore, the supercapacitor showed a single-electrode specific capacitance of 83.16 F g at -23 °C (68% of the one exhibited at 25 °C). Therefore, the multifunctional performance of the CMC/PAA/Fe/LiCl hydrogel is anticipated to play an exemplary role in a new generation of flexible electronics.
导电水凝胶在柔性电子学领域展现出了巨大的潜力，但其实际应用可能会受到耗时且耗能的聚合过程的阻碍。在本研究中，我们提出了一种木质素磺酸钠-铁（SLS-Fe）策略来应对这一挑战，并利用羧甲基纤维素（CMC）和聚丙烯酸制备了具有良好自愈性能、抗冻性能且电导率提高6倍的CMC/PAA/Fe/LiCl互穿导电水凝胶。基于水凝胶的柔性应变传感器展示出了较宽的检测范围（400%）、高灵敏度（在200%-400%时GF = 6.19）以及人体运动检测能力。基于水凝胶的超级电容器表现出122.36 F g的单电极比电容，成功为发光二极管供电。此外，该超级电容器在-23°C时的单电极比电容为83.16 F g（为25°C时的68%）。因此，CMC/PAA/Fe/LiCl水凝胶的多功能性能有望在新一代柔性电子学中发挥示范作用。
