Photoresponsive Smart Coloration Electrochromic Supercapacitor

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Electrochromic devices have been widely adopted in energy saving applications by taking advantage of the electrode coloration, but it is critical to develop a new electrochromic device that can undergo smart coloration and can have a wide spectrum in transmittance in response to input light intensity while also functioning as a rechargeable energy storage system. In this study, a photo-responsive electrochromic supercapacitor based on cellulose-nanofiber/Ag-nanowire/reduced-graphene-oxide/WO3-composite electrode that is capable of undergoing "smart" reversible coloration while simultaneously functioning as a reliable energy-storage device is developed. The fabricated device exhibits a high coloration efficiency of 64.8 cm(2) C-1 and electrochemical performance with specific capacitance of 406.0 F g(-1), energy/power densities of 40.6-47.8 Wh kg(-1) and 6.8-16.9 kW kg(-1). The electrochromic supercapacitor exhibits excellent cycle reliability, where 75.0% and 94.1% of its coloration efficiency and electrochemical performance is retained, respectively, beyond 10 000 charge-discharge cycles. Cyclic fatigue tests show that the developed device is mechanically durable and suitable for wearable electronics applications. The smart electrochromic supercapacitor system is then integrated with a solar sensor to enable photoresponsive coloration where the transmittance changes in response to varying light intensity.
Publisher
WILEY-V C H VERLAG GMBH
Issue Date
2017-08
Language
English
Article Type
Article
Keywords

SILVER-NANOWIRE NETWORKS; ENERGY-STORAGE; HIGH-PERFORMANCE; TRANSPARENT CONDUCTORS; GRAPHENE OXIDE; THIN-FILMS; ELECTRODES; COMPOSITES; WINDOWS; SURFACE

Citation

ADVANCED MATERIALS, v.29, no.32

ISSN
0935-9648
DOI
10.1002/adma.201606728
URI
http://hdl.handle.net/10203/226460
Appears in Collection
EEW-Journal Papers(저널논문)
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