Issue 47, 2017

Elastic soft hydrogel supercapacitor for energy storage

Abstract

High-performance supercapacitors, as highly promising candidates for bridging the gap between conventional lithium-ion batteries and traditional electrostatic capacitors, are the key to progress in the field of energy storage. To improve the performance of supercapacitors, the exploration of novel functional electrode materials is always at the forefront of technology. Herein, the rational design of a novel deformable soft supercapacitor, which is based on a compressible capacitive polyvinyl alcohol/polypyrrole (PVA/PPy) composite hydrogel and a flexible carbon nanotubes (CNTs) film, is reported. Due to the unique layered wrinkle structure of the PVA/PPy composite hydrogel, whose internal structure contains a large amount of water, the fabricated supercapacitor exhibits fascinating mechanical properties, including elasticity, compressibility and softness. In addition, the CNTs self-supported film without any binder shows an excellent flexibility as well as a stable capacitance in long-term cycles, which results in an enhanced cycle performance of the (PVA/PPy)(−)//CNTs(+) supercapacitor. Furthermore, the (PVA/PPy)(−)//CNTs(+) supercapacitor exhibits a high working voltage (0–2 V) accompanied with an energy density of 33.3 W h kg−1 (a power density of 1600 W kg−1). The high-performance compressible soft supercapacitor with deformability heralds a new territory of hydrogel-based supercapacitor for energy storage applications.

Graphical abstract: Elastic soft hydrogel supercapacitor for energy storage

Supplementary files

Article information

Article type
Paper
Submitted
15 Sep 2017
Accepted
08 Nov 2017
First published
08 Nov 2017

J. Mater. Chem. A, 2017,5, 24942-24950

Elastic soft hydrogel supercapacitor for energy storage

B. Yin, S. Zhang, Q. Ren, C. Liu, K. Ke and Z. Wang, J. Mater. Chem. A, 2017, 5, 24942 DOI: 10.1039/C7TA08152A

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