Large Expansion of Operating Voltage Window in Polymer Based Flexible Solid State Supercapacitor
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MRS Advances © 2018 Materials Research Society DOI: 10.1557/adv.2018.158
Large Expansion of Operating Voltage Window in Polymer Based Flexible Solid State Supercapacitor
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Curtis White , Tristan Skinner , Kevin Santiago , Sangram K. Pradhan *, Messaoud Bahoura
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Center for Materials Science and Research, Norfolk State University, VA, 23504, USA
Electrical and Computer Engineering Dept. Tennessee State University, TN, 37209, USA
ABSTRACT
Specific demand of lightweight and high efficient flexible energy unit is increased day by day for its integration into bendable electronics devices. Super-capacitor is one of the promising power unit to meet the current requirement. Flexible metal oxide and polypyrrole based flexible electrode materials are prepared using electrodeposition. The calculated specific capacitances of the devices shows 0.5 mill farad per gram. The super-capacitor is ultra-flexible, stable with operational voltage window expands from 0.8 to 2.5 V which can help to reduce the number of super-capacitor in series connection to obtain the same output. In this study, a conductive polymer can be coupled with MnO2 to improve capacitance and conductivity of a hybrid structure based on MnO2.
INTRODUCTION Bendable and wearable electronic devices need specific electronic components, such as bendable displays and lightweight high efficient power sources and storage unit for better performance [1-8]. Supercapacitor is one of the most important energy storage devices used for rapid charge/discharge as oppose to long-term compact energy storage. When focusing on a smaller scale they are used for static random access memory. Conventional energy storage devices, such as batteries, have limitations such as inflexibility, relatively lower power density and long charging time [1]. However, apart from completely carbon based materials such as graphene, graphene oxide, carbon nanotubes other hybrid structure based on metal oxide and conducting polymers such as polypyrrole, polyaniline and polythiphene is a promising candidate for advanced supercapacitor electrode materials because of high specific area, excellent mechanical/flexible strength and large intrinsic carrier mobility [9-25]. The organic-inorganic composite active materials have very large potential in energy management and the ‘‘in situ growth for conductive wrapping’’ method might open up new ideas for creating next-
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generation energy storage devices [2]. Therefore, MnO2 is an interesting metal oxide with cost effective and environment friendly [3-5]. It is one of the materials having higher theoretical specific capacitance value. But, its poor electrical conductivity limited to achieve such higher value. Hence, the formation of complex structure with conducting polymer such as polypyrrole, the performance of the MnO2/
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