Abstract
The self-healing electrolytes play an essential role in self-healing supercapacitors. Herein, poly (vinyl alcohol)/sulphuric acid (PVA/H2SO4) hydrogel electrolytes with self-healing properties are prepared, which has been achieved by dynamic hydrogen bonds between PVA chains. The obtained PVA hydrogel displays fast self-healing capability, reliable mechanical performance (stress at 0.29 MPa after stretching to 238%) and high ionic conductivity (57.8 mS cm−1). Based on these excellent properties, an all-in-one self-healing supercapacitor is assembled by in situ polymerization of aniline on the surface of PVA/H2SO4 hydrogel electrolyte. The assembled all-in-one supercapacitor shows outstanding capacitance performance (specific capacitance 504 mF cm−2 at current density of 0.2 mA cm−2 and energy density 35 μWh cm−2 at power density 100 μW cm−2), good cycle stability (after 5000 cycles of charging and discharging, the capacitance retention rate is 77%), excellent flexibility and considerable self-healing performance (69% capacitance retention rate after the fifth self-healing cycle). This self-healing supercapacitor will promote the development of self-healing energy storage devices in wearable electronics.
Highlights
Flexible electronic devices have received broaden attention due to the booming market of wearable and portable products
The self-healing PVA/H2SO4 hydrogel electrolyte was facilely synthesized by physical crosslinking with hydrogen bonds
Even being lifted up and bent, the healed specimen assembled with different parts would not be broken again. These results show the outstanding self-healing performance of the PVA/H2SO4 hydrogel
Summary
Wen-Bin Ma1, Ke-Hu Zhu, Shi-Fang Ye1, Yao Wang, Lin Guo, Xue-Yu Tao1*, Li-Tong Guo, He-
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