Abstract Although aqueous fibrous supercapacitor is one of the most advantageous energy storage devices for powering wearable electronics due to its excellent flexibility, outstanding cycling stability and high safety, it is still a challenge for its electroactive components to be cold-tolerant and stretchable for adapting fluctuating climate environments. Herein, a graphene/PEDOT:PSS hydrogel fiber with a continuous rose flower-like network is firstly constructed, and an antifreezing polyvinyl alcohol (PVA) network is subsequently taken into the hydrogel fiber via solvent replacement to generate an antifreezing and stretchable graphene/PEDOT-PVA hydrogel fiber with dual networks. Benefiting from superior interface compatibility of the hydrogel fiber with a PVA electrolyte, the assembled all-gel-state supercapacitor delivers a high capacitance of 281.2 F g−1 (0.1 A g−1) at 25 °C, more than twice higher than that of an aerogel fiber-based supercapacitor. Furthermore, this supercapacitor exhibits stable subzero-temperature electrochemical performances due to the smooth ion-transport channels and good conductivity of the antifreezing hydrogel fiber electrode, evidenced by the high specific capacitance of 212.6 F g−1 and the excellent capacitance retention of 91% after 5000 charge/discharge cycles at −20 °C. Finally, a highly stretchable spring-like supercapacitor exhibits an excellent capacitance retention of 92% after 5000 stretching cycles at a strain of 500%.

中文翻译：

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由具有双网络的石墨烯/PEDOT-聚乙烯醇水凝胶纤维建立的具有增强电容的抗冻和可拉伸全凝胶态超级电容器

摘要 虽然水性纤维超级电容器因其优异的柔韧性、出色的循环稳定性和高安全性成为为可穿戴电子设备供电的最有利的储能装置之一，但其电活性组件的耐寒和可拉伸以适应波动仍然是一个挑战。气候环境。在此，首先构建了具有连续玫瑰花状网络的石墨烯/PEDOT:PSS水凝胶纤维，随后通过溶剂置换将防冻聚乙烯醇（PVA）网络带入水凝胶纤维中，生成抗冻且可拉伸的石墨烯/PEDOT -具有双重网络的PVA水凝胶纤维。受益于水凝胶纤维与 PVA 电解质的卓越界面兼容性，组装的全凝胶状态超级电容器在 25°C 时提供 281.2 F g-1 (0.1 A g-1) 的高电容，是基于气凝胶纤维的超级电容器的两倍多。此外，由于离子传输通道平滑，防冻水凝胶纤维电极具有良好的导电性，该超级电容器表现出稳定的零下温度电化学性能，212.6 F g-1 的高比电容和 91% 的优异电容保持率证明了这一点。 -20 °C 下 5000 次充电/放电循环。最后，高度可拉伸的弹簧状超级电容器在 500% 应变下 5000 次拉伸循环后表现出 92% 的优异电容保持率。由于离子传输通道平滑且防冻水凝胶纤维电极具有良好的导电性，该超级电容器表现出稳定的零下温度电化学性能，212.6 F g-1 的高比电容和 5000 次充电后 91% 的优异电容保持率证明了这一点/-20 °C 下的放电循环。最后，高度可拉伸的弹簧状超级电容器在 500% 应变下 5000 次拉伸循环后表现出 92% 的优异电容保持率。由于离子传输通道平滑且防冻水凝胶纤维电极具有良好的导电性，该超级电容器表现出稳定的零下温度电化学性能，212.6 F g-1 的高比电容和 5000 次充电后 91% 的优异电容保持率证明了这一点/-20 °C 下的放电循环。最后，高度可拉伸的弹簧状超级电容器在 500% 应变下 5000 次拉伸循环后表现出 92% 的优异电容保持率。