Browsing by Author "Sahoo S."

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Controlled Electrochemical Growth of Spinel NiCo2S4 Nanosheets on Nickel Foam for High Performance Supercapacitor Applications
(2018) Sahoo S.; Kumar Naik K.; Sekhar Rout C.
Spinel metal oxides/sulfides possess higher reversible capacity, better electronic conductivity and have been investigated for high performance electrode materials for supercapacitors. Herein, we report a facile, low-cost and one-step electrodeposition approach for the synthesis of thin film NiCo2S4 (NCS) nanosheet arrays on Ni foam substrate. The elemental composition and morphology of the materials are characterized by energy dispersive x-ray analysis and field-emission scanning electron microscopy. The supercapacitor performance of the NCS nanosheets are studied in three electrode configuration in 2M KOH electrolyte. The as-prepared binder free electrode showed a high specific capacitance of 1500 F/g at 3 A/g with excellent cycling stability even after 1000 charge/discharge cycles. Obtained energy density and power density of the NCS nanosheets are 50.58 Wh/Kg and 12.978 Kw/Kg respectively. The superior electrochemical performances are mainly attributed to its nanosheet like structure which provides large reaction surface area, fast ion and electron transfer rate. � 2018 Elsevier Ltd.
Efficient Photoelectrocatalytic Activity of CuWO4 Nanoplates towards the Oxidation of NADH Driven in Visible Light
(2018) Mohanty B.; Naik K.K.; Sahoo S.; Jena B.; Chakraborty B.; Rout C.S.; Jena B.K.
Herein, we report the visible light driven photo-electrocatalytic activity of CuWO4 towards the oxidation of NADH. The CuWO4 possesses high sensitivity towards NADH oxidation with the sensing response in a linear dynamic range of 10�50 ?M. The sensitivity and low detection limit (LOD) was estimated to be 0.14 ?A/?M and 100 nM (S/N ? 3) respectively. The photo-generated hole expedites the oxidation processing by accepting the electrons from NADH that reduces the overpotential and increases the current response and validated by the Density Functional Theory (DFT) simulations study. � 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim
Electrochemical synthesis of a ternary transition metal sulfide nanosheets on nickel foam and energy storage application
(2017) Sahoo S.; Naik K.K.; Late D.J.; Rout C.S.
We report growth of nickel cobalt sulfide (NCS) ultrathin nanosheets directly on Ni foam substrate by a facile and novel electrodeposition method. The as-prepared NCS sample is used as an electrode material for supercapacitor application due to their large electrochemically active surface area and interconnected nanosheet channels for the facilitation of ion transportation. The NCS nanosheets possess enhanced electrochemical performance in terms of fast and high reversible faradaic reactions characterized by prominent oxidation and reduction peaks. NCS nanosheets showed an ultrahigh specific capacitance of 1712 Fg?1 at a current density of 1 Ag?1 with excellent cyclic stability. The excellent supercapacitor performance of NCS nanosheets can be attributed to its rich redox reactions as well as high transport rate for both electrolyte ions and electrons. � 2016 Elsevier B.V.
Electrodeposited Nickel Cobalt Manganese based mixed sulfide nanosheets for high performance supercapacitor application
(2017) Sahoo S.; Mondal R.; Late D.J.; Rout C.S.
Porous multi component Nickel Cobalt Manganese Sulfide (NCMS) nanosheets have been grown on Ni foam by cathodic electrodeposition method. The as-prepared NCMS nanosheets sample is used as an electrode material for supercapacitor application due to its large electrochemically active surface and high porosity structure. Moreover, NCMS nanosheets have good electrical and mechanical connections to the conductive Ni foam to achieve enhanced reaction kinetics with improved electrode integrity. The NCMS nanosheets exhibit an ultrahigh specific capacitance of 2717 F/g at a current density of 1 A/g with excellent cyclic stability and energy density of 94.07 Wh/kg. The electrodeposited NCMS nanosheets with extraordinary electrochemical performance enable the novel electrodes to hold great potential for high efficient energy storage systems. � 2017 Elsevier Inc.
Electrodeposition of spinel MnCo2O4 nanosheets for supercapacitor applications
(2015) Sahoo S.; Naik K.K.; Rout C.S.
Herein, we report a facile, low-cost and one-step electrodeposition approach for the synthesis MnCo2O4 (MCO) nanosheet arrays on indium doped tin oxide (ITO) coated glass substrates. The crystalline phase and morphology of the materials are studied by x-ray diffraction, energy dispersive x-ray analysis and field-emission scanning electron microscopy. The supercapacitor performance of the MCO nanosheets are studied in a three-electrode configuration in 2 M KOH electrolyte. The as-prepared binder-free electrode shows a high specific capacitance of 290 F g-1 at 1 mV s-1 with excellent cyclic stability even after 1000 charge/discharge cycles. The obtained energy density and power density of the MCO nanosheets are 10.04 Wh kg-1 and 5.2 kW kg-1 respectively. The superior electrochemical performances are mainly attributed to its nanosheet like structure which provides a large reaction surface area, and fast ion and electron transfer rate. � 2015 IOP Publishing Ltd.
Fabrication and characterization of LaFeO3-BaTiO3 electroceramics
(2018) Sahoo S.; Das S.; Mahapatra P.K.; Choudhary R.N.P.
The structural, electrical and multiferroic characteristics of (Ba1-xLax) (Ti1-xFex)O3 (i.e., (1-x) BaTiO3-xLaFeO3) with (x = 0.0�0.5) were investigated. The samples prepared through a chemico-thermal route were found to crystallize in a tetragonal structure similar to that of its parent BaTiO3. Elemental content, surface morphology and vibrational characteristics (from Raman spectra) of the samples were also analyzed. The temperature dependence of dielectric characteristics of all the materials has been studied using a multi-peak Gaussian model. The dielectric peaks are attributed to the magnetic transitions of LaFeO3 and the ferroelectric-paraelectric transition of BaTiO3. The existence of multiple transitions in (Ba1-xLax) (Ti1-xFex)O3 compounds leads to higher values of dielectric constant in a wide range of temperature. Due to the high dielectric or tangent loss of the materials with higher x content, these materials might be suitable for use as microwave absorber. The relaxation and conduction mechanism of all the materials have been investigated. The multiferroic characteristics of the samples have been analyzed with room temperature P-E, M ? H and M-E plot. � 2018 Elsevier B.V.
Facile electrochemical growth of spinel copper cobaltite nanosheets for non-enzymatic glucose sensing and supercapacitor applications
(2017) Naik K.K.; Sahoo S.; Rout C.S.
Herein, we report a facile and low-cost electrodeposition approach for the synthesis of Copper Cobaltite (CuCo2O4) nanosheets on indium doped tin oxide (ITO) coated glass substrates. The crystal structure and morphology of the material are characterized by X-ray diffraction, energy dispersive X-ray analysis, Raman spectroscopy, field-emission scanning electron microscopy and transmission electron microscopy. The synthesized CuCo2O4 nanosheets are composed of numerous nanoparticles and showed enhanced electrochemical activity for the glucose sensing and supercapacitor applications. The non-enzymatic glucose sensing performance of the nanosheets exhibits sensitivity of 8.25 ?A?M?1 cm?2, linear range of detection of 5�110 ?M and response time of 15 s towards glucose molecules. Similarly, supercapacitor fabricated using the CuCo2O4 nanosheets as the active electrode shows high specific capacitance of 100 F/g at a current density of 1 A/g with remarkable cycling stability. � 2016 Elsevier Inc.
Facile Electrochemical Synthesis of Porous Manganese-Cobalt-Sulfide Based Ternary Transition Metal Sulfide Nanosheets Architectures for High Performance Energy Storage Applications
(2016) Sahoo S.; Rout C.S.
In this study, we have reported a facile growth of ultrathin mesoporous manganese cobalt sulfide (MCS) nanosheet arrays on Ni-foam substrate by a facile electrodeposition approach for high performance supercapacitor applications. We have developed the extremely energy-saving and rapid synthetic methodologies for the growth of highly active binary transition metal sulfide. The nanosheet architectures have been characterized using the techniques such as XRD, FESEM, TEM, XPS and Raman spectroscopy to understand the growth mechanism. The high porosity, high surface area and good electrical conductivity of the MCS nanosheets arrays make it a promising electrode material for supercapacitor. MCS nanosheets exhibit a high specific capacitance of 2421 Fg?1 at a current density of 1 Ag?1 along with excellent cycling stability, demonstrating its potential as an efficient electrode material for next generation supercapacitors. � 2016 Elsevier Ltd
Gear fault diagnosis using active noise cancellation and adaptive wavelet transform
(2014) Jena D.P.; Sahoo S.; Panigrahi S.N.
Acoustic signal from a gear mesh with faulty gears is in general non-stationary and noisy in nature. Present work demonstrates improvement of Signal to Noise Ratio (SNR) by using an active noise cancellation (ANC) method for removing the noise. The active noise cancellation technique is designed with the help of a Finite Impulse Response (FIR) based Least Mean Square (LMS) adaptive filter. The acoustic signal from the healthy gear mesh has been used as the reference signal in the adaptive filter. Inadequacy of the continuous wavelet transform to provide good time-frequency information to identify and localize the defect has been removed by processing the denoised signal using an adaptive wavelet technique. The adaptive wavelet is designed from the signal pattern and used as mother wavelet in the continuous wavelet transform (CWT). The CWT coefficients so generated are compared with the standard wavelet based scalograms and are shown to be apposite in analyzing the acoustic signal. A synthetic signal is simulated to conceptualize and evaluate the effectiveness of the proposed method. Synthetic signal analysis also offers vital clues about the suitability of the ANC as a denoising tool, where the error signal is the denoised signal. The experimental validation of the proposed method is presented using a customized gear drive test setup by introducing gears with seeded defects in one or more of their teeth. Measurement of the angles between two or more damaged teeth with a high level of accuracy is shown to be possible using the proposed algorithm. Experiments reveal that acoustic signal analysis can be used as a suitable contactless alternative for precise gear defect identification and gear health monitoring. � 2013 Elsevier Ltd. All rights reserved.
Hydrothermal synthesis of CuWO4-reduced graphene oxide hybrids and supercapacitor application
(2016) Samantaray K.S.; Sahoo S.; Rout C.S.
This study reports a facile hydrothermal synthesis of Copper tungsten oxide (CuWO4) and CuWO4-reduced graphene oxide hybrid nanoparticles and its application as an electrode for supercapacitor application. The morphology and composition has been characterized using X-Ray Diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM) and EDAX. The supercapacitive behavior has been studied from cyclic voltammetry and galvanostatic charge-discharge tests. The CuWO4-reduced graphene oxide hybrid nanoparticles show highest specific capacitance of 35.71 F/g at a current density of 0.25 A/g with excellent cycling stability. � 2016 Koyal Suman Samantaray, Surjit Sahoo and Chandra Sekhar Rout.
Impression creep behaviour of TiB2 particles reinforced steel matrix composites
(2018) Sahoo S.; Jha B.B.; Mahata T.S.; Sharma J.; Murthy T.S.R.C.; Mandal A.
Impression creep behaviour of the powder metallurgy processed steel matrix composites was investigated under constant stress at different temperatures in the range of 873�973 K. By using the power-law relationship, the estimated activation energy for unreinforced steel was found to be 149 kJ mol?1 and steel reinforced with 2 and 4 vol.-% TiB2 was found to be 298 and 338 kJ mol?1, respectively indicating better creep resistance of the reinforced steel matrix composites. Dislocation creep is the dominant creep mechanism based on the calculated values of stress exponent and activation energy. Hence, this method can be used to assess the potential of steel matrix composites for use as structural materials for high-temperature application. � 2018, � 2018 Institute of Materials, Minerals and Mining.
Influence of reinforcement and processing on steel-based composites: Microstructure and mechanical response
(2018) Sahoo S.; Jha B.B.; Sahoo T.K.; Mandal A.
Steel matrix composite reinforced with 2�4 vol.% titanium diboride particles was fabricated successfully by powder metallurgy route through hot pressing method. Influence of sintering parameters on densification was investigated by measurement of density of resultant composites. Microstructural analysis of hot-pressed materials was performed. Hardness and deformation behavior under constant load were evaluated by conducting microhardness and nanoindentation tests. The addition of titanium diboride proved to be effective for enhancement of hardness and strength. Composite with 4 vol.% titanium diboride sintered at 1100�C resulted in improved hardness and elastic modulus which could be related to Orowan strengthening resulting from homogeneous distribution of fine titanium diboride particles in steel matrix. The results indicate that proposed method is economically feasible to process steel matrix composites with improved properties. A comparatively lower temperature and pressure offers better control of interface kinetics and microstructure. � 2017 Taylor & Francis.
Mechanical and Wear Behaviour of Hot-Pressed 304 stainless Steel Matrix Composites Containing TiB 2 Particles
(2019) Sahoo S.; Jha B.B.; Mahata T.; Sharma J.; Murthy T.S.R.C.; Mandal A.
In the present article, mechanical and wear behaviour of hot-pressed 304 stainless steel matrix composites containing 2 and 4�vol% TiB 2 particles was investigated. A density of over 92% was achieved at optimum hot-pressing temperature and TiB 2 particles� content. Microhardness and yield strength of the composites were found to be improved remarkably as compared to their unreinforced counterpart. The enhancement of mechanical properties of the composites was discussed in light of their microstructural aspects and different possible strengthening mechanism models. Taylor strengthening was found to be dominant strengthening mechanism as compared to Orowan strengthening and load-bearing effect. Dry sliding wear behaviour was also investigated under load of 35�N at sliding speed 0.3�m/s. The wear resistance of the composites was found to be improved owing to uniform distribution of hard TiB 2 particles. Based on our findings, it was concluded that processing parameters and amount of TiB 2 have significant influence on mechanical and wear behaviour of steel matrix composites. � 2019, The Indian Institute of Metals - IIM.
Mixed nickel cobalt manganese oxide nanorods for supercapacitor application
(2016) Mondal R.; Sahoo S.; Rout C.S.
Mixed Nickel Cobalt Manganese oxide (NiCoMn-Oxide) is a new class of excellent material for supercapacitor application. Here, hydrothermal synthesis technique has been employed to prepare mixed NiCoMn-Oxide nanorods. The elemental composition and morphology of this material were validated by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and EDX techniques. To analyze the capacitive performance of this material, cyclic voltammetry and galvanostatic charge-discharge tests were performed. A maximum specific capacitance of ~500 F/g was obtained for the mixed NiCoMn-oxide material within a potential range of-0.5 to 0.5 V (Vs. Ag/AgCl) in 2 M aqueous KOH solution. � 2016 Rajat Mondal, Surjit Sahoo and Chandra Sekhar Rout.
Plasma-treated multilayer graphene: Synthesis and applications
(2016) Gelamo R.V.; De S Augusto G.; Machuno L.G.B.; Moshkalev S.; Vaz A.R.; Rout C.S.; Sahoo S.
This work presents the study of multilayer graphene (MLG) obtainment and functionalization using plasmas of different gas species. MLGs were obtained using mechanical exfoliation methods of pre-exfoliated graphite in acids. The functionalization of MLGs was made through cold plasma using mixtures of CO2 and Ar gases. Investigation of electrical, optical and morphological properties are presented and discussed. Structure and chemical composition were investigated with Raman, XPS and other techniques. MLGs showed a certain incorporation of oxygen as can be seen in XPS results. We investigated the treatment conditions and the changes in the materials obtained particularly the properties of MLGs films and pellets. Applications of these treated MLGs in super capacitor devices are herein presented and discussed, enabling applications in electronic devices and energy storage areas. � 2016 IEEE.
Spinel NiCo2O4 nanorods for supercapacitor applications
(2015) Sahoo S.; Ratha S.; Rout C.S.
Herein, we report successful synthesis method of spinel NiCo2O4 nanorods by a low-cost and facile hydrothermal route. Cyclic Voltametry (CV) and galvanostatic Charge-Discharge (CD) measurements deduce ideal supercapacitive performance (823 F/g) of spinel NiCo2O4 nanorods at a nominal current density of 0.823 A/g with excellent cyclic stability and energy density of 28.51 Wh/Kg. � 2015 Surjit Sahoo, Satyajit Ratha and Chandra Sekhar Rout.