Rajaram College

Kolhāpur, India

Rajaram College

Kolhāpur, India

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Chourashiya M.G.,Shivaji University | Bharadwaj S.R.,Bhabha Atomic Research Center | Jadhav L.D.,Rajaram College
Thin Solid Films | Year: 2010

In the present research, spray pyrolysis technique is employed to synthesize 10%Gd-doped ceria (GDC) thin films on ceramic substrates with an intention to use the "film/substrate" structure in solid oxide fuel cells. GDC films deposited on GDC substrate showed enhanced crystallite formation. In case of NiO-GDC composite substrate, the thickness of film was higher (∼ 13 μm) as compared to the film thickness on GDC substrate (∼ 2 μm). The relative density of the films deposited on both the substrates was of the order of 95%. The impedance measurements revealed that ionic conductivity of GDC/NiO-GDC structure was of the order of 0.10 S/cm at 500 °C, which is a desirable property for its prospective application. © 2010 Elsevier B.V. All rights reserved.


Jamale A.P.,Shivaji University | Dubal S.U.,Shivaji University | Patil S.P.,Shivaji University | Bhosale C.H.,Shivaji University | Jadhav L.D.,Rajaram College
Applied Surface Science | Year: 2013

The crack free, homogeneous, nanocrystalline La0.6Sr 0.4Co0.2Fe0.8O3 thin films have been deposited on Ce0.9Gd0.1O1.95 electrolyte by the spray pyrolysis technique. The films with typically 1-2 μm thickness, get crystallized on annealing at 800 C. In the present work, the effect of substrate temperature on microstructure, crystallization and conductivity has been systematically studied. The deposition of film at 300 C shows higher in plane electrical conductivity of 26.6 S cm-1 with activation energy, Ea = 0.23 eV. The higher conductivity attributes to uniform, thin and dense microstructure of thin films. No interfacial reaction products between La0.6Sr0.4Co0.2Fe0.8O3 and Ce0.9Gd0.1O1.95 were detected upon annealing at 800 C/4 h. The uniformity and porosity distribution as a function of deposition temperature clarified from Scanning Electron micrograph. © 2013 Elsevier B.V. All rights reserved.


Chourashiya M.G.,Shivaji University | Jadhav L.D.,Rajaram College
International Journal of Hydrogen Energy | Year: 2011

In the present research work spray pyrolysis technique (SPT) is employed to synthesize GDC (10%Gd doped ceria) thin films on anode-grade-ceramic substrate (porous NiO-GDC). The film/substrate structure was characterized for their micro-structural and electrical properties along with their interfacial-quality. By optimization of preparative parameters of SPT and modification of surface of anode-grade ceramic substrate, we were able to prepare the GDC films having thickness of the order of 13 μm on NiO-GDC substrate. Further to improve the interfacial quality and densification of film, annealing of structure at 1000 °C for 8 h was carried out which leads to fully dense (>96%) GDC films, forming a gas-tight interface with substrate. Impedance measurements revealed that grain interior conductivity for GDC/NiO-GDC half-cell was of the order of 0.1S/cm at 500 °C which is the desired conductivity for successful operation of IT-SOFC. The activation energy for grain interior and grain-boundary conduction estimated for GDC/NiO-GDC was 1.07 eV and 0.93 eV, respectively. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.


Jamale A.P.,Shivaji University | Bhosale C.H.,Shivaji University | Jadhav L.D.,Rajaram College
Journal of Alloys and Compounds | Year: 2015

In present paper, La0.6Sr0.4Co0.2Fe0.8O3- δ (LSCF)/Ce0.9Gd0.1O1.95 (GDC)/LSCF structure has been studied to understand electrode/electrolyte interface. The nanocrystalline powder required for screen printing was obtained through solution combustion synthesis with glycine as a fuel. The LSCF powder synthesized at fuel to oxidant ratio of two is calcined at 900 °C as TG-DTA reveals thermal stability only beyond 900 °C. The X-ray diffraction pattern of calcined powder demonstrates rhombohedral perovskite structured LSCF with 27 nm crystallite size. However, dynamic laser scattering shows 0.9 μm sized agglomerates while TEM shows 74 nm particles. For potential application in solid oxide fuel cells, the temperature programmed reduction and oxidation were done on the LSCF. The results exhibit strong reduction and oxidation behavior around 860 and 388 °C, respectively. The cell with LSCF as an electrode shows minimum charge transfer resistance of 6.3 Ω cm2 at 550 °C. © 2014 Elsevier B.V. All rights reserved.


Kulkarni S.B.,Shivaji University | Kulkarni S.B.,Rajaram College | Jagadale A.D.,Shivaji University | Kumbhar V.S.,Shivaji University | And 3 more authors.
International Journal of Hydrogen Energy | Year: 2013

Current paper comprises the electrodeposition of nanostructured porous Co1-xNix layered double hydroxide (Co1-xNi x LDHs) thin films on to stainless steel substrate by a potentiodynamic mode. The compositional impacts on the various properties of Co1-xNix LDHs are examined via structural, morphological, surface wettability and electrochemical studies. The nanocrystalline Co 1-xNix LDHs thin films possess varying porous, nanoflake like morphology and superhydrophilic behavior by the composition influence. Electrochemical studies demonstrate the supercapacitive performance of Co 1-xNix LDHs thin film electrodes. The maximal specific capacitance for Co1-xNix LDHs electrode is found to be ∼1213 F g-1 for composition Co0.66Ni0.34 LDH in 2 M KOH electrolyte at 5 mV s-1 scan rate owing specific energy of 104 Whkg-1, specific power of 1.44 kW kg-1 with ∼94% of coulomb efficiency and stability of electrode retained to 77% after 10,000th cycle. The high capacitance retention proposes the deposited Co 1-xNix LDHs thin film as promising contender for supercapacitor applications. © 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.


Dubal S.U.,Shivaji University | Jamale A.P.,Shivaji University | Bhosale C.H.,Shivaji University | Jadhav L.D.,Rajaram College
Applied Surface Science | Year: 2015

The nanocrystalline BaCe0.7Zr0.1Y0.2O2.9 (BCZY) thin films have been deposited on alumina substrate by simple and economic spray pyrolysis technique. The spray deposited films were annealed at different temperatures and were characterized by different physio-chemical techniques. The XRD studies revealed orthorhombic structured BCZY thin films with little shift in 2θ compared to BCY. The crystallite size and grain size were observed to enhance with annealing temperature. The grain growth was completed by 1000 °C and compact structure was obtained at 1100 °C. Evolution of the surface microstructure and roughness of the BCY and BCZY thin films is done using AFM. Raman spectra of BCZY and BCY exhibits pronounced characteristic band at 359 and 353.25 cm-1 respectively. The proton conductivity of BCZY thin film in moist atmosphere was 0.83 × 10-3 S cm-1 at 400 °C. © 2014 Elsevier B.V. All rights reserved.


Kulkarni S.B.,Shivaji University | Kulkarni S.B.,Rajaram College | Patil U.M.,Shivaji University | Salunkhe R.R.,Shivaji University | And 2 more authors.
Journal of Alloys and Compounds | Year: 2011

The temperature influenced morphology evolution and its effect on physico-chemical properties of ZnO thin films deposited onto glass substrates from alkaline environment, complexed via EDTA chelant are systematically studied. Temperature dependent growth mechanism model for change in microstructure is proposed. The physico-chemical properties of deposited films are studied by the analysis of structural, morphological, surface wettabillity, optical and electrical properties. Nanocrystalline ZnO thin films with hexagonal structure having mari-gold flowers and tetra pods like morphologies with optical band gaps 3.1 and 2.96 eV showed drastic surface wettabillity transformation from highly hydrophobic (142°) to superhydrophilic (<5°) behavior for bath placed at room temperature (300 K) and 333 K, respectively. The room temperature photoluminescence spectrum in the visible light region showed decreasing in intensity and electric resistivity measurement showed reduction in electrical resistivity from 106 to 10 4 Ω cm as consequence of increment in deposition temperature. The morphology evolution as impact of bath temperature can provide wide scope with significant change in physico-chemical properties of smart ZnO, which can be potentially tuned in many functional applications with feasibility. © 2010 Elsevier B.V. All rights reserved.


Dubal S.U.,Shivaji University | Bhosale C.H.,Shivaji University | Jadhav L.D.,Rajaram College
Ceramics International | Year: 2015

Doped barium cerate is a promising solid electrolyte for intermediate temperature fuel cells as a protonic conductor. In the present paper, the nanocrystalline Gd-doped barium cerate (BaCe0.7Gd0.1Y0.2O2.9) thin films have been successfully deposited on alumina substrate by spray pyrolysis technique. The films deposited from 0.1 M concentration and annealed at five different temperatures were characterized with different physio-chemical techniques. The BCGY is crystallized in orthorhombic perovskite structure with slight shift to the lower 2θ value compared with barium cerate (BC) and yttrium doped barium cerate (BCY). The grain growth and hence densification is also investigated by using SEM and AFM. The grain growth is almost complete at 1000 °C and the surface of the film appears to be smooth with typical roughness of 152 nm. Raman spectrum of BCGY film shows intense band at 463.8 cm-1 compared to pure BC and BCY indicating the presence of more oxygen vacancies due to Gd doping. The proton conductivity of BCGY thin film in moist atmosphere is 1×10-3 Scm-1. © 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.


Khomane A.S.,Rajaram College | Hankare P.P.,Shivaji University
Journal of Alloys and Compounds | Year: 2010

Cadmium selenide (CdSe) thin films have been deposited on glass substrate. CdSe thin films were characterized by various techniques such as X-ray diffraction, scanning electron microscopy and UV-vis-NIR double beam spectrophotometer. The electrical and thermo-electrical properties are also studied. The X-ray diffraction analysis shows that the film samples are in cubic crystal structure. The optical band gap energy (Eg) was found to be 1.7 eV. © 2009 Elsevier B.V. All rights reserved.


Jadhav L.D.,Rajaram College | Chourashiya M.G.,Shivaji University | Jamale A.P.,Shivaji University | Chavan A.U.,Shivaji University | Patil S.P.,Shivaji University
Journal of Alloys and Compounds | Year: 2010

In recent years, doped ceria is an established and promising candidate as solid electrolyte for intermediate temperature solid oxide fuel cell (IT-SOFC). In this investigation, synthesis and characterizations of nano-crystalline Gd doped ceria, (Ce1-xGdxO2-x/2, where x = 0-0.3), prepared using glycine-nitrate process (GNP) has been presented. Evolution of structural and morphological properties of nano-powders as a function of heat treatment has also been studied. The prepared samples were characterized using TG-DTA, FT-IR, Raman spectroscopy, XRD, SEM, etc. In addition, the effect of Gd content over the micro-structural properties of nano-crystalline Gd doped ceria was investigated. Raman analysis of calcined powders confirms the formation of the solid solution of Ce1-xGdxO2-x/2 instead of mixture of CeO2 and Gd2O3. The solid solutions obeyed Vegard's rule very well. Grain growth of sintered samples was observed to hinder with an increase in Gd content. © 2010 Elsevier B.V. All rights reserved.

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