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Performance of High Energy Density Symmetric Supercapacitor Based on Sputtered MnO 2 Nanorods
Author(s) -
Kumar Ashwani,
Sanger Amit,
Kumar Arvind,
Mishra Yogendra Kumar,
Chandra Ramesh
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201600757
Subject(s) - supercapacitor , nanorod , materials science , capacitance , electrode , substrate (aquarium) , power density , energy storage , current density , optoelectronics , electrochemistry , anode , fabrication , nanotechnology , sputter deposition , chemical engineering , sputtering , thin film , power (physics) , chemistry , medicine , oceanography , physics , alternative medicine , quantum mechanics , pathology , geology , engineering
Here, we demonstrate the fabrication of binder free and very efficient supercapacitor electrodes based on MnO 2 nanorods on silver (Ag) coated porous anodic aluminum oxide (AAO) substrate in a very simple way by DC magnetron sputtering. The Ag coated porous AAO substrate acts as excellent current collector and also enhances high specific capacitance of MnO 2 up to ∼796 F/g. A symmetric supercapacitor device in form of α ‐MnO 2 nanorods/Ag/AAO electrode has been fabricated, characterized and its performance has been investigated in detail. The binder free supercapacitor device delivered a high capacitance (132 F/g), good cycling ability (95.52 % capacitance retention after 3000 cycles), high energy density (26.4 Wh/kg), and also a high power density (∼36 kW/kg at 6 Wh/kg) in a voltage range of 1.3 V. These observed excellent electrochemical performances of the present MnO 2 nanorods based device, suggest it tremendous potential as supercapacitor electrodes in energy storage applications.