近日，課題組在支鏈淀粉增粘水凝膠（https://onlinelibrary.wiley.com/doi/10.1002/adfm.202108
423）研究基礎上，開發(fā)出新型黏附水凝膠電解質，可為解決儲能器件中的電解質-電極界面問題提供新思路。
該水凝膠電解質以化學交聯(lián)聚丙烯酰胺（PAM）為基礎網(wǎng)絡，支鏈淀粉（Amy）在其中形成半互穿結構。支鏈淀粉的分支結構與極性基團賦予水凝膠電解質高界面黏附性，高濃度氯化鋅幫助提升環(huán)境適應性。雙重設計共同構建穩(wěn)固的電解質-電極界面，降低界面阻抗。
基于此電解質的 ZHSCs 表現(xiàn)優(yōu)異，循環(huán)穩(wěn)定性超 32000 次，容量保持率達 81%，在形變狀態(tài)和零下環(huán)境中仍穩(wěn)定工作，為惡劣條件下儲能器件性能提升提供新思路。
論文題目：Sustainable biomass enabled adhesive hydrogel electrolytes for highly stable and bendable zinc-ion hybrid supercapacitors
論文鏈接：https://www.sciencedirect.com/science/article/abs/pii/S1385894725102167
論文摘要：Zinc-ion hybrid supercapacitors (ZHSCs) containing hydrogel electrolytes exhibit superior advantages to most energy storage devices, but weak electrolyte-electrode interface and poor environmental adaptability of hydrogel electrolytes often limit the electrochemical performances of supercapacitors under specific conditions. Inspired by sustainable and highly sticky nature of crops containing rich amylopectin (Amy), molecular engineering of adhesive hydrogel electrolytes containing chemically cross-linked polyacrylamide (PAM) network semi-interpenetrated by Amy is proposed to address the above issues. Because of the branched molecular structure and abundant polar groups, Amy endows the hydrogel electrolytes with high adhesiveness, and high-concentration ZnCl2 is introduced to make the hydrogel electrolytes excellent environmental adaptability. Well-constructed hydrogel electrolytes provide a robust electrolyte-electrode interface and lowered interfacial impedance. Consequently, high charge/discharge stability (>32,000 cycles) and capacity retention (81 % after 32,000 cycles) have been achieved. Moreover, such ZHSCs also exhibit outstanding cycling stability in deformed states and subzero conditions. Bio-inspired adhesive hydrogel electrolytes herein are expected to provide a promising strategy for promoting the electrochemical performances of energy storage devices in harsh conditions.