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RISS 인기검색어
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- 저자 : P. P. Murmu (검색결과 3 건)
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Jana, M.,Saha, S.,Khanra, P.,Murmu, N.C.,Srivastava, S.K.,Kuila, T.,Lee, J.H. Elsevier 2014 Materials science and engineering B. Advanced Func Vol.186 No.-
Green reduction of graphene oxide (GO) using drained water from soaked mung beans (Phaseolus aureus L.) has been demonstrated. In comparison to the toxic and hazardous reducing chemicals, the drained water from soaked mung beans (P. aureus L.) is completely green reducing agent, the reduction process is very simple and cost effective. The removal of oxygen containing functional groups of GO has been confirmed by UV-vis, Fourier transform infrared and X-ray photoelectron spectroscopy analysis. Morphological characterization of rGO has been performed by atomic force and transmission electron microscopy analysis. Electrochemical performances of rGO have been evaluated by cyclic voltammetry (CV), charge-discharge and electrochemical impedance spectroscopy techniques. The specific capacitance (SC) of rGO has been found to be 137Fg<SUP>-1</SUP> at a current density of 1.3Ag<SUP>-1</SUP>. The retention in SC is more than 98% after 1000 charge-discharge cycles suggesting long-term electrochemical cyclic stability as supercapacitor electrode materials.
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Microstructural, Electrical and Magnetic Properties of Erbium Doped Zinc Oxide Single Crystals
P. P. Murmu,J. Kennedy,B. J. Ruck,S. Rubanov 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.6
We report the structural, electrical and magnetic properties of erbium (Er) implanted zinc oxide (ZnO) single crystals. Rutherford backscattering and channeling results showed that the majority of Er atoms resided in Zn substitutional lattice sites. Annealing led to a fraction of Er atoms moving into random interstitial sites. Transmission electron microscopy micrographs revealed that doped Er atoms were located in the nearsurface region, consistent with the results obtained from DYNAMICTRIM calculations. A non-linear Hall-voltage was observed near 100 K, which is associated with inhomogeneous transport in the material. The Er implanted and annealed ZnO exhibited persistent magnetic ordering to room temperature. Ferromagnetism was likely from the presence of intrinsic defects in ZnO, which mediates the magnetic ordering in Er implanted and annealed ZnO.
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Jana, M.,Kumar, J.S.,Khanra, P.,Samanta, P.,Koo, H.,Murmu, N.C.,Kuila, T. Elsevier Sequoia 2016 Journal of Power Sources Vol.303 No.-
A novel strategy to synthesize hierarchical rod like MnCO<SUB>3</SUB> on the reduced graphene oxide (RGO) sheets by a facile and cost-effective hydrothermal method is demonstrated. The chelating action of citric acid facilitates the formation a complex intermediate of Mn<SUP>2+</SUP> and citrate ions, which finally results a 3D MnCO<SUB>3</SUB>/RGO (MRGO) composite with high electrical conductivity (~1056 S m<SUP>-1</SUP>), good surface area (59 m<SUP>2</SUP> g<SUP>-1</SUP>) and high pore volume (0.3 cm<SUP>3</SUP> g<SUP>-1</SUP>). The specific capacitance (SC) of the MRGO composite is ~1120 F g<SUP>-1</SUP> at a current density of 2 A g<SUP>-1</SUP> in three electrode system. An asymmetric device has been designed with MRGO as positive and sono-chemically reduced RGO (SRGO) as negative electrode material. The asymmetric device (MRGO//SRGO) shows the SC of ~318 F g<SUP>-1</SUP> (at 2 A g<SUP>-1</SUP>) and energy density of ~113 W h kg<SUP>-1</SUP> (at 1600 W kg<SUP>-1</SUP>). The true energy density (1.7 W h kg<SUP>-1</SUP>) has been calculated considering the total weight of the device. The MRGO//SRGO device can power a wall clock for ~13 min after full charging. The Nyquist plot of the asymmetric cell has been simulated with Z-View software to measure the solution resistance, charge-transfer resistance and Warburg elements.
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