Open AccessStretchable supercapacitor based on a hierarchical PPy/CNT electrode and hybrid hydrogel electrolyte with a wide operating temperature
Author(s) -
Ren Yanfang,
Liu Yunlong,
Wang Siying,
Wang Qian,
Li Shuhong,
Wang Wenjun,
Dong Xiaochen
Publication year - 2022
Publication title -
carbon energy
Language(s) - English
Resource type - Journals
ISSN - 2637-9368
DOI - 10.1002/cey2.214
Subject(s) - supercapacitor , electrolyte , materials science , polypyrrole , quasi solid , capacitance , carbon nanotube , electrode , chemical engineering , electrochemistry , ethylene glycol , nanotechnology , polymer , composite material , polymerization , chemistry , engineering , dye sensitized solar cell
Hydrogel is frequently used as a solid electrolyte for all solid‐state supercapacitors (SCs) because of its liquid‐like ion‐transport property and high conformability. However, due to the higher water content, the hydrogel electrolyte undergoes inevitable freezing and/or dehydration with climate change. Herein, polypyrrole/carbon all‐solid‐state SCs (PCSCs) were developed based on a hierarchical polypyrrole/carbon nanotube electrode and a highly stretchable double‐network polymer hydrogel electrolyte with LiCl/ethylene glycol as a mixed solvent. The PCSCs showed excellent electrochemical performance and cycle stability with a wide operating temperature. The specific capacitances could reach 202.2 and 112.3 mF cm −2 at current densities of 0.5 and 3.0 mA cm −2 , respectively. Meanwhile, the PCSCs showed outstanding mechanical properties in maintaining a high areal capacitance under deformations of bending and tension. The excellent water retention of the device also ensured the stable electrochemical performance of PCSCs in a wide temperature range (30–80°C), which could potentially represent a reliable application in various harsh environments.