Sputtered Synthesis of MnO2 Nanorods as Binder Free Electrode for High Performance Symmetric Supercapacitors. (20th December 2016)

• Record Type: Journal Article
• Authors: Kumar, Ashwani; Sanger, Amit; Kumar, Arvind; Kumar, Yogesh; Chandra, Ramesh
• Is Part Of: Electrochimica acta. Volume 222(2016)
• Page Start: 1761
• Page End: 1769
• Publication Date: 2016-12-20
• Subjects: Porous AAO -- MnO2 nanorods -- binder free -- symmetric supercapacitor -- DC sputtering -- energy storage; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2016.10.161
• Languages: English
• ISSNs: 0013-4686

Abstract

Graphical abstract: Highlights: α-MnO2 nanorods were prepared by DC reactive sputtering for the first time. The binder free symmetric supercapacitor device delivered energy density (4.2 Whkg −1 ) with power density (1.4 kWkg −1 ). Our approach opens up new opportunities for the development of large scale, high performance and stable energy storage devices. Abstract: Among numerous active electrode materials, manganese oxides are promising electrodes in supercapacitors. Manganese oxides research has thus far focused on the synthesis of one-dimensional (1-D) metal oxide nanostructured materials, which can have superior electrochemical performance. Several chemical methods are used to synthesize metal oxide nanostructured which involve toxic reagents, solvents and introduction of byproducts. However, physical method offers an eco-friendly path to develop contamination free 1-D metal oxide nanostructured materials. Here, we report the fabrication of binder free supercapacitor electrode of MnO2 nanorods on Nickel (Ni) coated porous anodic aluminum oxide (AAO) by DC magnetron sputtering for first time. Ni coated porous AAO substrate act as excellent current collector, enhancing the specific capacitance of MnO2 to 649 F/g. The binder free symmetric supercapacitor device delivered a high areal capacitance (112.6 mF/cm 2 ), specific capacitance (194.23 Fg −1 ), good cyclic ability (89.83%) retention in capacitance after 5000 cycles), energy density (4.2 Whkg −1 ), and power density (1.4 kWkg −1 at 0.718 Whkg −1 ). These outstanding electrochemical performances, suggest their tremendous potential as supercapacitor electrode in energy storage application.