用于高能量密度超级电容器的柔性木材增强型聚（丙烯酸-共-丙烯酰胺）/季铵化明胶水凝胶电解质,ACS Applied Materials & Interfaces

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用于高能量密度超级电容器的柔性木材增强型聚（丙烯酸-共-丙烯酰胺）/季铵化明胶水凝胶电解质
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2023-01-03 , DOI: 10.1021/acsami.2c18935
Chenxiang Gao _{1,

2} , Zunchang Gao _{1,

2} , Yanqing Wei _{1,

2} , Na Luo _{1,

2} , Yang Liu _{1,

2} , Pengfei Huo _{1,

2}

Affiliation

具有良好柔韧性和强亲水性的水凝胶可以成为优良的柔性电解质材料的候选者。然而，水凝胶电解质的结构稳定性差、不可控的溶胀和较低的电势窗口需要改进。这项工作将季铵化明胶与交联聚（丙烯酸-共-丙烯酰胺）结合形成半互穿网络，并在柔性多孔木骨架中原位凝胶化。柔性木材 (FW) 骨架增强了水凝胶并限制了水凝胶的溶胀。此外，季铵基团和 FW 协同作用，使复合水凝胶电解质具有 5.57 × 10 ^–2 S cm ^{–1的高离子电导率}. 复合水凝胶电解质可以使柔性超级电容器在 0–2 V 的电位窗口内安全运行。优化后的超级电容器具有 286.74 F g ^–1的高比电容，并提供 39.09 W h kg ^–1的出色能量密度。柔性超级电容器在 10,000 次充放电循环后显示出高达 94.6% 的电容保持率，表明了显着的循环稳定性。同时，柔性超级电容器在180°弯曲1000次后仍能保持近90%的电容保持率。本研究提供了开发高性能水凝胶电解质和柔性超级电容器的可行思路。

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Flexible Wood Enhanced Poly(acrylic acid-co-acrylamide)/Quaternized Gelatin Hydrogel Electrolytes for High-Energy-Density Supercapacitors

Hydrogels with good flexibility and strong hydrophilicity can be candidates for excellent flexible electrolyte materials. However, the poor structural stability, uncontrollable swelling, and lower potential window of hydrogel electrolytes need to be improved. This work combined quaternized gelatin with cross-linked poly(acrylic acid-co-acrylamide) to form a semi-interpenetrating network and gelatinized in situ in a flexible porous wood skeleton. The flexible wood (FW) skeleton enhances the hydrogel and limits the swelling of the hydrogel. In addition, quaternary ammonium groups and FW act synergistically to provide the composite hydrogel electrolyte with a high ionic conductivity of 5.57 × 10^–2 S cm^–1. The composite hydrogel electrolyte can enable the flexible supercapacitor to operate safely in a potential window of 0–2 V. The optimized supercapacitor has a high specific capacitance of 286.74 F g^–1 and provides an outstanding energy density of 39.09 W h kg^–1. The flexible supercapacitor shows a capacitance retention of up to 94.6% after 10,000 charge–discharge cycles, indicating dramatic cycling stability. Simultaneously, a capacitance retention of nearly 90% can be maintained by the flexible supercapacitor after 180° bends for 1000 times. A viable idea for developing high-performance hydrogel electrolytes and flexible supercapacitors is provided in this research.

更新日期：2023-01-03

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