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Title: A Flexible, Redox-Active, Aqueous Electrolyte-Based Asymmetric Supercapacitor with High Energy Density Based on Keratin-Derived Renewable Carbon

Journal Article · · Advanced Materials Technologies

Abstract This work exploits the advantage of asymmetric configuration over symmetric supercapacitor in designing high energy density flexible devices from two active electrode materials–keratin‐based renewable‐resource hierarchically porous carbon and hydrous ruthenium oxide (RuO 2 ). The asymmetric device exhibits significantly high capacitance. Conventional estimation of energy storage parameters, however, cannot be applied for devices with a Faradaic energy storage contribution via redox charge transfer mechanism. Therefore, this work applies a precise measurement of pseudocapacitance contribution at various scan rates to correct the device data that reveals effective capacitance of 120 F g −1 with the energy density of 37 W h kg −1 at 776 W kg −1 . It also retains excellent rate capability, >74% at high current density 25 A g −1 . The charge storage activity and device stability can be further enhanced by introducing redox‐active electrolytes that improve specific capacitance, but the rate capabilities deteriorate at high current densities. Further, the principle of asymmetric electrode design is applied to fabricate a bending‐tolerant, flexible device by depositing active electrode material on wire‐shaped current collector followed by coupling those separated with polyvinyl alcohol gel containing redox electrolyte; it yields 36.8 mF cm −1 specific capacitance at a 0.2 mA cm −1 current density.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
Science and Engineering Research Board; USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC05-00OR22725; DE‐AC05‐00OR22725
OSTI ID:
1883867
Alternate ID(s):
OSTI ID: 1897946
Journal Information:
Advanced Materials Technologies, Vol. 7, Issue 11; ISSN 2365-709X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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