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Download fileGraphene-Bridged Multifunctional Flexible Fiber Supercapacitor with High Energy Density
journal contribution
posted on 2018-07-23, 00:00 authored by Libo Gao, Jian Song, James Utama Surjadi, Ke Cao, Ying Han, Dong Sun, Xiaoming Tao, Yang LuPortable
fiber supercapacitors with high-energy storage capacity are in great
demand to cater for the rapid development of flexible and deformable
electronic devices. Hence, we employed a 3D cellular copper foam (CF)
combined with the graphene sheets (GSs) as the support matrix to bridge
the active material with nickel fiber (NF) current collector, significantly
increasing surface area and decreasing the interface resistance. In
comparison to the active material directly growing onto the NF in
the absence of CF and GSs, our rationally designed architecture achieved
a joint improvement in both capacity (0.217 mAh cm–2/1729.413 mF cm–2, 1200% enhancement) and rate
capability (87.1% from 1 to 20 mA cm–2, 286% improvement),
which has never been achieved before with other fiber supercapacitors.
The in situ scanning electron microscope (SEM) microcompression test
demonstrated its superior mechanical recoverability for the first
time. Importantly, the assembled flexible and wearable device presented
a superior energy density of 109.6 μWh cm–2 at a power density of 749.5 μW cm–2, and
the device successfully coupled with a flexible strain sensor, solar
cell, and nanogenerator. This rational design should shed light on
the manufacturing of 3D cellular architectures as microcurrent collectors
to realize high energy density for fiber-based energy storage devices.