Flexible Solid-State Symmetric Supercapacitor Based on (Fe,Cr)2O3 Oxide Layer Developed on the Stainless Steel Mesh
2018
Deshmukh, Prashant R. | Sohn, Youngku | Shin, Weon Gyu
The present work describes a simple, easy, and scalable thermal oxidation process for the development of the polygonal structure of the (Fe,Cr)₂O₃ oxide layer on the stainless steel mesh in an ambient atmosphere. The developed oxide layer shows the maximum areal capacitance of 45.92 mF cm–² at a scan rate of 5 mV s–¹ with an extraordinary capacitance retention of 97% over the 10 000 cycles. Furthermore, a flexible solid-state symmetric supercapacitor is assembled with the (Fe,Cr)₂O₃ oxide layer as electrodes using polymer-gel electrolyte, which substantially demonstrates a pseudocapacitive nature with the maximum areal capacitance of 16.88 mF cm–² at a scan rate of 5 mV s–¹, capacitance retention of 90% after 10 000 cycles, an energy density (0.57 mWh cm–²) and power density (200 mW cm–²). Furthermore, it demonstrates constant capacitance retention over 500 bending cycles as well as excellent electrochemical durability (90% over 2000 cycles) under bent and twisted conditions. These charming performances suggest the present (Fe,Cr)₂O₃ oxide layer has a widespread potential application for next generation supercapacitors in high energy density flexible storage systems.
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