Stretchable supercapacitor based on a hierarchical PPy/CNT electrode and hybrid hydrogel electrolyte with a wide operating temperature. Issue 4 (18th May 2022)

• Record Type: Journal Article
• Authors: Ren, Yanfang; Liu, Yunlong; Wang, Siying; Wang, Qian; Li, Shuhong; Wang, Wenjun; Dong, Xiaochen
• Is Part Of: Carbon energy. Volume 4:Issue 4(2022)
• Page Start: 527
• Page End: 538
• Publication Date: 2022-05-18
• Subjects: antidrying property -- flexibility -- hydrogel electrolyte -- supercapacitor; Carbon -- Periodicals; Carbon dioxide industry -- Periodicals; Power resources -- Research -- Periodicals; Energy industries -- Periodicals; Power resources -- Research; Energy industries; Carbon dioxide industry; Carbon; Electronic journals; Periodicals; 620.193
• DOI: 10.1002/cey2.214
• Languages: English
• ISSNs: 2637-9368

Abstract

Abstract: 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. Abstract : Polypyrrole/carbon all‐solid‐state supercapacitors (PCSCs) were developed based on a hierarchical polypyrrole/carbon nanotube thin‐film electrode and a highly stretchable double‐network polymer hydrogel electrolyte with LiCl/ethylene glycol as a mixed solvent show excellent electrochemical performance and cycle stability under various mechanical deformations and higher operating temperatures. This study effectively broadens the application range of flexible supercapacitors.