Aqueous zinc-ion hybrid capacitors (ZHCs) are receiving immense attention in view of their merits in energy/power density, water compatibility, and economy. However, achieving superior ZHCs is also extremely challenging due to the ineluctable dendrite and side reaction issues of Zn anodes and the unsatisfactory capacity of carbon cathodes. Herein, we report a molecular-level regulation strategy to eliminate the current barriers from Zn anodes by designing a polysaccharide-reinforced hydrogel electrolyte of polyacrylamide/carboxymethyl cellulose/xanthan gum/zinc trifluoromethanesulfonate (PAM/CMC/XG/Zn(CF₃SO₃)₂). The fabricated hydrogel electrolyte can efficiently prevent dendrite formation and protect Zn anodes from the water-caused corrosion and hydrogen evolution reaction to achieve an extended life of the Zn//Zn cell over 230 h and a high average coulombic efficiency of 99.3% in the Zn//Cu cell. Additionally, a carbon fabric (GCNF), with a large surface area, N-doped structure, and plentiful microcrystalline regions, was finely designed as a binder-free cathode for aqueous ZHCs, which has a fairly high capacity of 173.8 mA h g⁻¹ with excellent rate characteristics. And the quasi-solid-state ZHC composed of PAM/CMC/XG/Zn(CF₃SO₃)₂ and GCNF demonstrates a high capacity retention of 93.5% over 10 000 cycles and an impressive energy density of 113.2 W h kg⁻¹ at a power density of 206.2 W kg⁻¹. Notably, the device is highly flexible without distinct capacity attenuation under deformations. The dual strategy of engineering electrolytes and cathodes offers a good platform for improving Zn-ion storage capacity.

中文翻译：

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具有多糖增强交联水凝胶电解质和无粘合剂碳阴极的柔性稳定的锌离子混合电容器

水系锌离子混合电容器 (ZHC) 因其在能量/功率密度、水相容性和经济性方面的优点而受到极大关注。然而，由于锌负极不可避免的枝晶和副反应问题以及碳正极的容量不尽如人意，实现优异的 ZHCs 也极具挑战性。_{在此，我们报告了一种分子水平的调节策略，通过设计聚丙烯酰胺/羧甲基纤维素/黄原胶/三氟甲磺酸锌 (PAM/CMC/XG/Zn(CF 3} SO ₃ ) 的多糖增强水凝胶电解质来消除锌阳极的电流障碍) ₂). 制造的水凝胶电解质可以有效地防止枝晶形成并保护锌阳极免受水引起的腐蚀和析氢反应，从而使锌//锌电池的寿命延长超过 230 小时，锌的平均库仑效率高达 99.3% //铜电池。此外，具有大表面积、N 掺杂结构和丰富微晶区域的碳纤维织物 (GCNF) 被精心设计为水性 ZHC 的无粘合剂阴极，具有相当高的容量 173.8 mA hg ^-1具有优良的速率特性。_{以及由PAM/CMC/XG/Zn(CF 3} SO ₃ ) ₂组成的准固态ZHCGCNF 在 10 000 次循环中表现出 93.5% 的高容量保持率，并且在 206.2 W kg ^{-1的功率密度下具有令人印象深刻的 113.2 W h kg -1}能量密度。值得注意的是，该设备非常灵活，在变形下没有明显的容量衰减。工程电解质和阴极的双重策略为提高锌离子存储容量提供了良好的平台。