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Jadhav P.R.,Shivaji University | Suryawanshi M.P.,Chonnam National University | Dalavi D.S.,Krishna Mahavidyalaya | Patil D.S.,Shivaji University | And 6 more authors.
Electrochimica Acta | Year: 2015

Abstract This paper highlights suitability of three dimensional (3D) network composed of manganese oxide nanofibers (NF-MnO2), synthesized by the potentiodynamic electrodeposition for supercapacitor application. Electrodeposition mechanism of manganese oxide is discussed with the help of electrochemical quartz crystal microbalance (EQCM) study and it reveals that maximum mass deposited on the electrode surface occurs at 0.85 V vs SCE. The FE-SEM images exhibit an interconnected 3-D network composed of MnO2 nanofibers with diameter varies from 10 to 27 nm and length of the order of 0.1 to 0.5 μm, exhibiting high aspect ratio. XPS measurements revealed that the peak appeared at binding energies of 642.6 and 654.05 eV attributed to the Mn4+ state in the NF-MnO2. The maximum specific capacitance of ∼392 F.g-1 at 10 mV.s-1 by using cyclic voltammetry (CV) and 383 F.g-1 at a current density of 2 mA.cm-2 by charge discharge studies were achieved for the NF-MnO2 in an electrolyte of 1 M Na2SO4. The NF-MnO2 exhibits an excellent rate capability with high specific energy of ∼48.74 Wh.kg-1 and specific power of ∼2.12 kW.kg-1. The high specific capacitance and charge-discharge rates offered by NF-MnO2 make them promising candidates for supercapacitor electrodes, combining high-energy densities with high levels of power delivery. © 2015 Elsevier Ltd.

Dalavi D.S.,Krishna Mahavidyalaya | Harale N.S.,Shivaji University | Mulla I.S.,CMET - Photonics And Advanced Materials Laboratory | Rao V.K.,Defence Research and Development Establishment | And 4 more authors.
Materials Letters | Year: 2015

The nanoporous network of nickel oxide (NiO) thin films have been synthesized by a facile chemical bath deposition method (CBD) at various deposition times. The X-ray diffraction (XRD) patterns of annealed NiO films revealed low intense peaks, confirming nanocrystalline nature with cubic structure. The scanning electron microscopy (SEM) images exhibited well-defined and nanoporous interconnected network. The gas sensing properties of NiO thin films for ammonia gas were investigated. The measurements revealed that the sample deposited at 50 min (Ni50) exhibit better gas sensing performance, due to its high surface area and maximum pore-volume available for gas adsorption. © 2015 Published by Elsevier B.V.

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