Flexible, Swiss roll, fiber-shaped, asymmetric supercapacitor using MnO2 and Fe2O3 on carbon fibers. (10th April 2018) - Cho, Sungdong
Abstract: We report a successful demonstration of a Swiss roll, fiber-shaped, asymmetric supercapacitor (FSASC) fabricated with MnO2 as a positive electrode and Fe2 O3 as a negative electrode, both on carbon fibers as the current collector, with a high operating voltage of 2.0 V. The suggested Swiss roll FSASC device exhibited a high gravimetric energy density of 33.1 Wh kg −1 and a volumetric energy density of 0.16 mWh cm −3, with excellent rate capability, cycling stability, and coulombic efficiency. Additionally, the Swiss roll FSASC showed great durability and flexibility under mechanical stress. The promising performance of the Swiss roll FSASC suggests its potential for applications in wearable and flexible energy storage devices. Graphical abstract: A Swiss roll, fiber-shaped, asymmetric supercapacitor (FSASC) was successfully fabricated by simply rolling an Fe2 O3 /CF negative electrode and a MnO2 /CF positive electrode with PVA-LiClO4 gel electrolyte. This Swiss roll FSASC can be operated in large potential windows up to 2.0 V and shows excellent rate capability, cycling stability, and device flexibility. Highlights: A Swiss roll, fiber-shaped, asymmetric supercapacitor (FSASC) was fabricated via a facile method. MnO2 /CFs and Fe2 O3 /CFs were used as the positive and negative electrodes, respectively, in the designed supercapacitor. The Swiss roll FSASC showed a high gravimetric energy density of 33.1 Wh kg −1 . The Swiss roll FSASC exhibited good rate capability, long cycle life, and excellent flexibility. The Swiss roll FSASC maintained electrochemical stability under repeated mechanical stresses.