Versatile Biomass Hydrogel Electrolyte for Supercapacitors:Exceptional Water Retention,Robust Adhesion,Subzero Self-Healing,and All-Climate Cycling StabilityOA
Developing hydrogel electrolytes that simultaneously overcome the critical challenges of rapid dehydration,narrow operational temperature windows,poor interfacial adhesion,and irreparable mechanical damage remains an urgent need for reliable supercapacitors,since these challenges significantly compromise their cycling stability.Herein,a versatile biomass hydrogel electrolyte(PSBGD-Li)is developed through dynamic borate ester crosslinking between peach gum polysaccharide and starch,integrating exceptional water retention(≥66 days,92.01%retention),wide temperature adaptability(−30℃ to 50℃),rapid subzero self-healing(99.4%recovery in 5 min at−30℃),high ionic conductivity(34.71 mS cm⁻¹ at 25℃;9.22 mS cm⁻¹ at−30℃),and excellent mechanical robustness(>1600% strain without breakage,30.7 kPa interfacial adhesion).Supercapacitors equipped with PSBGD-Li exhibit superior all-climate electrochemical cycling stability,delivering a high specific capacitance of 216 F g⁻¹ at 25℃ with 98.6%capacitance retention after 15000 cycles.Remarkably,they maintain outstanding temperature reliability,retaining 99.2%capacitance at −30℃ and 92.4% at 50℃,while preserving >99% specific capacitance after sequential thermal cycling between −30℃ and 50℃.Flexible supercapacitors also maintain stable electrochemical performance after repeated bending or cutting/healing cycles,highlighting significant potential for developing green,temperature-tolerant,reliable flexible energy storage in extreme environments.
Nannan Zhu;Yibin Xing;Qijin Teng;Xiyao Wang;Renyang Han;Bing Du;Xuejuan Wan
Guangdong Provincial Key Laboratory of New Energy Materials Service Safety,Shenzhen Key Laboratory of Polymer Science and Technology,College of Materials Science and Engineering,Shenzhen University,Shenzhen 518060,ChinaGuangdong Provincial Key Laboratory of New Energy Materials Service Safety,Shenzhen Key Laboratory of Polymer Science and Technology,College of Materials Science and Engineering,Shenzhen University,Shenzhen 518060,ChinaGuangdong Provincial Key Laboratory of New Energy Materials Service Safety,Shenzhen Key Laboratory of Polymer Science and Technology,College of Materials Science and Engineering,Shenzhen University,Shenzhen 518060,ChinaGuangdong Provincial Key Laboratory of New Energy Materials Service Safety,Shenzhen Key Laboratory of Polymer Science and Technology,College of Materials Science and Engineering,Shenzhen University,Shenzhen 518060,ChinaGuangdong Provincial Key Laboratory of New Energy Materials Service Safety,Shenzhen Key Laboratory of Polymer Science and Technology,College of Materials Science and Engineering,Shenzhen University,Shenzhen 518060,ChinaGuangdong Provincial Key Laboratory of New Energy Materials Service Safety,Shenzhen Key Laboratory of Polymer Science and Technology,College of Materials Science and Engineering,Shenzhen University,Shenzhen 518060,ChinaGuangdong Provincial Key Laboratory of New Energy Materials Service Safety,Shenzhen Key Laboratory of Polymer Science and Technology,College of Materials Science and Engineering,Shenzhen University,Shenzhen 518060,China
信息技术与安全科学
all-climate supercapacitorsbiomass hydrogel electrolyteflexible energy storagesubzero self-healingwater retention
《Energy & Environmental Materials》 2026 (3)
P.413-423,11
N.Z.and Y.X.contributed equally to this work.The financial support from the Natural Science Foundation of Guangdong Province(2024A1515012372)the National Natural Science Foundation of China(21875144)the Shenzhen Science and Technology Research Grant(JCYJ20200109105003940)is gratefully acknowledgedsupport from the Instrumental Analysis Center of Shenzhen University is acknowledged.
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