首页|Mechanical reliable,NIR light-induced rapid self-healing hydrogel electrolyte towards flexible zinc-ion hybrid supercapacitors with low-temperature adaptability and long service life

Mechanical reliable,NIR light-induced rapid self-healing hydrogel electrolyte towards flexible zinc-ion hybrid supercapacitors with low-temperature adaptability and long service life

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Hydrogel electrolytes hold great potential in flexible zinc ion supercapacitors(ZICs)due to their high con-ductivity,good safety,and flexibility.However,freezing of electrolytes at low temperature(subzero)leads to drastic reduction in ionic conductivity and mechanical properties that deteriorates the perfor-mance of flexible ZICs.Besides,the mechanical fracture during arbitrary deformations significantly prunes out the lifespan of the flexible device.Herein,a Zn2+and Li+co-doped,polypyrrole-dopamine dec-orated Sb2S3 incorporated,and polyvinyl alcohol/poly(N-(2-hydroxyethyl)acrylamide)double-network hydrogel electrolyte is constructed with favorable mechanical reliability,anti-freezing,and self-healing ability.In addition,it delivers ultra-high ionic conductivity of 8.6 and 3.7 S m-1 at 20 and-30 ℃,respec-tively,and displays excellent mechanical properties to withstand tensile stress of 1.85 MPa with tensile elongation of 760％,together with fracture energy of 5.14 MJ m-3.Notably,the fractured hydrogel elec-trolyte can recover itself after only 90 s of infrared illumination,while regaining 83％of its tensile strain and almost 100％of its ionic conductivity during-30-60 ℃.Moreover,ZICs coupled with this hydrogel electrolyte not only show a wide voltage window(up to 2 V),but also provide high energy density of 230 Wh kg-1 at power density of 500 W kg-1 with a capacity retention of 86.7％after 20,000 cycles under 20 ℃.Furthermore,the ZICs are able to retain excellent capacity even under various mechanical defor-mation at-30 ℃.This contribution will open up new insights into design of advanced wearable flexible electronics with environmental adaptability and long-life span.

Flexible zinc ion supercapacitorHydrogel electrolyteSelf-healingAnti-freezing

Tengjia Gao、Na Li、Yang Yang、Jing Li、Peng Ji、Yunlong Zhou、Jianxiong Xu

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School of Materials and Advanced Manufacturing,Hunan Key Laboratory of Electrochemical Green Metallurgy Technology,Hunan University of Technology,Zhuzhou 412007,Hunan,China

School of Life Sciences and Chemistry,Hunan Key Laboratory of Biomedical Nanomaterials and Devices,Hunan University of Technology,Zhuzhou 412007,Hunan,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of China"Hejian"Innovative Talent Project of Hunan ProvinceHunan Provincial Natural Science FoundationScientific Research Foundation of Hunan Provincial EducationScientific Research Foundation of Hunan Provincial Education

52174247223020662022RC10882023JJ4025522B059923A0442

2024

10.1016/j.jechem.2023.12.038

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.92(5)