基于棉纺织废料和生物聚合物电极的环保超级电容器架构
Eco-Friendly Supercapacitor Architecture Based on Cotton Textile Waste and Biopolymer-Based Electrodes
AI总结：
本研究利用棉纺织废料和生物聚合物开发环保超级电容器，通过改性水凝胶和壳聚糖基电极实现高导电性和可持续储能。
摘要：
本研究提出了一种环保且生物基的对称超级电容器，利用棉纺织废料衍生的水凝胶作为电解质，以及壳聚糖基碳电极作为无金属电荷存储组件。通过碱性溶解-凝胶化路线合成棉衍生水凝胶，并用硫氰酸铵（NH4SCN）进行改性以增强离子导电性。离子改性使水凝胶导电性从17.1增加到37.8 mS cm^-1，证实了离子传输效率几乎提高一倍。所得水凝胶表现出改进的热稳定性、均匀的离子传输和强聚合物-离子相互作用，经FTIR和TGA分析证实。在对称器件中，离子改性水凝胶实现了降低等效串联电阻、加快电荷转移动力学和较短的时间常数（tau=3.2 s），与商用储能系统相当。经过1000次循环后，器件表现出特定电容增加12.3%，证实了稳定的概念验证操作。循环导致R_ESR（18到22欧）和tau（3.2到4.1 s）的适度增加，表明电荷-离子再分布变慢。值得注意的是，该R_ESR包括测试电池设置的贡献；在紧凑型硬币型配置中，电阻会显著降低。EIS显示界面电阻项同时上升，与循环后水凝胶变暗和FTIR证据中的Fe-SCN配位一致，表明电阻增加主要源于当排出的液体到达不锈钢收集器时的次要Fe-SCN相互作用，而非电容功能的丧失。总体而言，这些结果证明了棉废料衍生水凝胶和壳聚糖基电极作为可持续组件用于绿色储能的可行性，提供了一种可回收且环保的替代传统系统的方案。
英文摘要：
This study presents an eco-friendly and bio-based symmetric supercapacitor using cotton textile waste-derived hydrogels as electrolytes and chitosan-based carbon electrodes as metal-free charge-storage components. Cotton-derived hydrogels were synthesized via an alkaline dissolution-gelation route and modified with ammonium thiocyanate (NH4SCN) to enhance ionic conductivity. The ionic modification increased the hydrogel conductivity from 17.1 to 37.8 mS cm^-1, confirming a nearly twofold improvement in ion transport efficiency. The resulting hydrogel exhibited improved thermal stability, homogeneous ionic transport, and strong polymer-ion interactions confirmed by FTIR and TGA analyses. In a symmetric device, the ion-modified hydrogel enables reduced equivalent series resistance, faster charge-transfer kinetics, and a short time constant (tau = 3.2 s), comparable to commercial energy-storage systems. After 1000 cycles, the device exhibits a 12.3% increase in specific capacitance, confirming stable proof-of-concept operation. Cycling leads to a moderate increase in R_ESR (18 to 22 ohm) and tau (3.2 to 4.1 s), indicating slower charge-ion redistribution. Notably, this R_ESR includes the contribution of the test-cell setup; in compact coin-type configurations, the resistance would be considerably lower. EIS reveals a concurrent rise in interfacial resistive terms, consistent with post-cycling hydrogel darkening and FTIR evidence of Fe-SCN coordination, suggesting that resistance buildup mainly originates from minor Fe-SCN interactions when the expelled liquid reaches the stainless-steel collector, rather than from loss of capacitive functionality. Overall, these results demonstrate the viability of cotton waste-derived hydrogels and chitosan-based electrodes as sustainable components for green energy storage, offering a recyclable and eco-friendly alternative to conventional systems.
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