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Updated: Feb 11, 2026

Evaluating the Electrochemical Properties of Supercapacitors using the Three-Electrode System
Published on: January 7, 2022
Flexible Asymmetric Solid-State Supercapacitors by Highly Efficient 3D Nanostructured α-MnO2 and h-CuS Electrodes
Amar M Patil1, Abhishek C Lokhande2, Pragati A Shinde1
1Centre of Interdisciplinary Research , D. Y. Patil University , Kolhapur 416006 , Maharashtra , India.
Abstract:
A simplistic and economical chemical way has been used to prepare highly efficient nanostructured, manganese oxide (α-MnO2) and hexagonal copper sulfide (h-CuS) electrodes directly on cheap and flexible stainless steel sheets. Flexible solid-state α-MnO2/flexible stainless steel (FSS)/polyvinyl alcohol (PVA)-LiClO4/h-CuS/FSS asymmetric supercapacitor (ASC) devices have been fabricated using PVA-LiClO4 gel electrolyte. Highly active surface areas of α-MnO2 (75 m2 g-1) and h-CuS (83 m2 g-1) electrodes contribute to more electrochemical reactions at the electrode and electrolyte interface. The ASC device has a prolonged working potential of +1.8 V and accomplishes a capacitance of 109.12 F g-1 at 5 mV s-1, energy density of 18.9 Wh kg-1, and long-term electrochemical cycling with a capacity retention of 93.3% after 5000 cycles. Additionally, ASC devices were successful in glowing seven white-light-emitting diodes for more than 7 min after 30 s of charging. Outstandingly, real practical demonstration suggests "ready-to-sell" products for industries.
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