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Epidermal Supercapacitor with High Performance
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DOI：10.1002/adfm.201603480.png)
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Abstract
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Recent development in epidermal and bionic electronics systems has promoted the increasing demand for supercapcacitors with micrometer-thickness and good compatibility. Here, a highly flexible free-standing epidermal supercapacitor (SC-E) with merely 1 mu m thickness and high performance is developed. Single-walled carbon nanotube/poly(3,4-ethylenedioxythiophene)hybrid films with unique inner-connected reticulation are adopted as electrodes for ultrathin structure and high electric conductivity. Then, based on two substrates with different surface energies, a stepwise lift-off method is presented to peel off the ultrathin integrated supercapacitor from the substrates nondestructively. As a result of the high conductive hybrid electrodes and the thin electrolyte layer, the as-designed supercapacitors (based on the total mass of two electrodes) achieve a good capacitance of 56 F g(-1) and a superhigh power density of 332 kW kg(-1), which manifest superior performance in contrast to the other devices fabricated by traditional electrodes. Meanwhile, the ultrashort response time of 11.5 ms enables the epidermal supercapacitor (SC-E) work for high-power units. More importantly, the free-standing structure and outstanding flexibility (105 times bending) endow the SC-E with excellent compatibility to be integrated and work in the next generation of smart and epidermal systems.
Keywords:
CARBON NANOTUBE FILMS
SOLID-STATE SUPERCAPACITORS
REDUCED GRAPHENE OXIDE
HIGH-ENERGY DENSITY
HIGH-POWER
MICRO-SUPERCAPACITORS
STRETCHABLE SUPERCAPACITORS
TRANSPARENT
ELECTRONICS
DEVICES
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