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A Triblock Copolymer Design Leads to Robust Hybrid Hydrogels for High-Performance Flexible Supercapacitors
journal contribution
posted on 2017-09-25, 00:00 authored by Guangzhao Zhang, Yunhua Chen, Yonghong Deng, Chaoyang WangWe
report here an intriguing hybrid conductive hydrogel as electrode
for high-performance flexible supercapacitor. The key is using a rationally
designed water-soluble ABA triblock copolymer (termed as IAOAI) containing
a central poly(ethylene oxide) block (A) and terminal poly(acrylamide)
(PAAm) block with aniline moieties randomly incorporated (B), which
was synthesized by reversible additional fragment transfer polymerization.
The subsequent copolymerization of aniline monomers with the terminated
aniline moieties on the IAOAI polymer generates a three-dimensional
cross-linking hybrid network. The hybrid hydrogel electrode demonstrates
robust mechanical flexibility, remarkable electrochemical capacitance
(919 F/g), and cyclic stability (90% capacitance retention after 1000
cycles). Moreover, the flexible supercapacitor based on this hybrid
hydrogel electrode presents a large specific capacitance (187 F/g),
superior to most reported conductive hydrogel-based supercapacitors.
With the demonstrated additional favorable cyclic stability and excellent
capacitive and rate performance, this hybrid hydrogel-based supercapacitor
holds great promise for flexible energy-storage device.