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Kolhāpur, India

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. Source

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. Source

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. Source

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. Source

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. Source

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