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Elastic Soft Hydrogel Supercapacitor


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 novel deformable soft supercapacitor, which is based on compressible capacitive polyvinyl alcohol/polypyrrole (PVA/PPy) composite hydrogel and flexible carbon nanotubes (CNTs) film, is reported. Due to the unique layered wrinkle structure of PVA/PPy composite hydrogel whose internal structure contains lots of water medium, the fabricated supercapacitor keeps 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 (PVA/PPy)(-)//CNTs(+) supercapacitor. Furthermore, (PVA/PPy)(-)//CNTs(+) supercapacitor exhibits a high working voltage (0-2 V) accompanied with an energy density of 33.3 Wh kg-1 (a power density of 1600W kg-1). The high-performance compressible soft supercapacitor with deformability heralds a new territory of hydrogel-based supercapacitor for energy storage applications.

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Publication details

The article was received on 15 Sep 2017, accepted on 08 Nov 2017 and first published on 08 Nov 2017

Article type: Paper
DOI: 10.1039/C7TA08152A
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Elastic Soft Hydrogel Supercapacitor

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

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