Shrikant Kulkarni - Academia.edu (original) (raw)

Uploads

Papers by Shrikant Kulkarni

Research paper thumbnail of Study of glycine nitrate precursor method for the synthesis of gadolinium doped ceria (Ce0.8Gd0.2O1.90) as an electrolyte for intermediate temperature solid oxide fuel cells

RSC Adv., 2014

This is a detailed study of the synthesis parameters and their effects on the physical properties... more This is a detailed study of the synthesis parameters and their effects on the physical properties and ionic conductivity of gadolinium-doped ceria prepared using a glycine nitrate precursor combustion method.

Research paper thumbnail of MnFe2O4: Synthesis, morphology and electrochemical properties

AIP Conference Proceedings, 2017

MnFe2O4 has been synthesized by simple ammonia assisted co-precipitation method to obtain nanocry... more MnFe2O4 has been synthesized by simple ammonia assisted co-precipitation method to obtain nanocrystalline powder. X-ray diffraction studies confirmed its crystallinity and phase purity. The MnFe2O4 calcined at 1000°C for 4 h has spinel crystal structure with Fd3m space group and lattice constant 8.511 A. The electrode was prepared by dip coating method on stainless steel substrate and fired at 600°C for 2 h. Random shape grains of 0.2 to 1.5 micron with pores of 1-2 micron dimensions were observed in SEM images. The electrochemical studies of MnFe2O4 were carried out with 1 mole Na2SO4 electrolyte. The MnFe2O4 electrode shows highest specific capacitance of 27.53 F.g−1 and interfacial capacitance of 0.83 F.cm−2.

Research paper thumbnail of Hausmannite Manganese oxide cathodes for supercapacitors: Surface Wettability and Electrochemical Properties

Electrochimica Acta, 2017

Highlights of paper: 1. Mn3O4 thick films by spray pyrolysis 2. Selection of electrolyte using Co... more Highlights of paper: 1. Mn3O4 thick films by spray pyrolysis 2. Selection of electrolyte using Contact Angle Measurement 3. Porous morphology of the films 4. Study of two important spray pyrolysis method parameters 5.

Research paper thumbnail of Oxygen ion conducting glass ceramic composites for high temperature sensor applications

2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS), 2015

The present work is about preparation and characterization of high temperature oxygen sensing com... more The present work is about preparation and characterization of high temperature oxygen sensing composite material consisting of Gadolinium doped Ceria (GDC) together with a relatively low temperature melting, ionic conducting glass to facilitate lower sintering and operating temperature. This paper reports the physical and ionic conductivity properties of this sintered composite as a function of operating temperature.

Research paper thumbnail of Taguchi design of experiments for optimization of ionic conductivity in nanocrystalline Gadolinium doped Ceria

Ceramics International, 2015

Research paper thumbnail of Nanocrystalline Gadolinium doped Ceria (Ce<inf>0.8</inf>Gd<inf>0.2</inf>O<inf>3-δ</inf>) for oxygen sensor and solid oxide fuel cell applications

2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1), 2012

ABSTRACT Gadolinium doped Ceria (GDC) is a known oxygen ion conductor in intermediate temperature... more ABSTRACT Gadolinium doped Ceria (GDC) is a known oxygen ion conductor in intermediate temperature range. This is a preliminary work aimed at exploring the suitability of using nanocrystalline GDC as oxygen sensor in intermediate operating temperature range (500°C–700°C). The nanocrystalline Gadolinium doped Ceria (GDC) has been prepared by sol-gel method with EDTA as chelating agent. Particle size around 10±5nm was obtained after calcination at 600°C. Pellets prepared using this material were sintered 1350°C, which show 90% of the theoretical density. The dc and ac (1Hz–1MHz) conductivity of these pellet was measured in the temperature range 200–600°C and 500–700°C respectively. Highest conductivity of the order of 4.61X10−5 S/cm was recorded at 700°C. Possible reasons for low conductivity are discussed.

Research paper thumbnail of Oxygen ion transport through the electrolyte in Solid Oxide Fuel Cell

2013 International Conference on Renewable Energy Research and Applications (ICRERA), 2013

ABSTRACT The oxygen ion transport through the electrolyte of Solid Oxide Fuel Cells (SOFC&#39... more ABSTRACT The oxygen ion transport through the electrolyte of Solid Oxide Fuel Cells (SOFC&#39;s) has been studied in this work. The modeling with relevant validation with experimental data is explained. The temperature dependence of ion mobility and flux is also explored.

Research paper thumbnail of Sol–gel synthesis and protonic conductivity of yttrium doped barium cerate

Journal of Sol-Gel Science and Technology, 2014

ABSTRACT Proton ion conducting nanocrystalline yttrium doped barium cerate (BCYO) is synthesized ... more ABSTRACT Proton ion conducting nanocrystalline yttrium doped barium cerate (BCYO) is synthesized by EDTA-citric acid assisted sol-gel method. The effect of pH of the precursor on crystal structure, morphology and ionic conductivity is studied in pH range 6-11. The X-ray diffraction studies indicate that pure orthorhombic perovskite phase is obtained in acidic precursor pH of 6 at much lower calcination temperature (900 °C) than that reported earlier. Increase in pH causes formation of impurities, such as, BaCeO3, Ce(OH)2 and Ce0.8Y0.2O3 along with orthorhombic and monoclinic phases of BCYO. This deteriorates the sintered density and ionic conductivity of the samples. The sample prepared at pH 6 and sintered at 1,350 °C shows above 95 % of the theoretical density. Ionic conductivity of about 0.04 S cm−1 at 700 °C and activation energy of 0.16 ± 0.01 eV between 500-700 °C is obtained at pH 6, which are the best values reported for BCYO.

Research paper thumbnail of Study of glycine nitrate precursor method for the synthesis of gadolinium doped ceria (Ce0.8Gd0.2O1.90) as an electrolyte for intermediate temperature solid oxide fuel cells

RSC Adv., 2014

This is a detailed study of the synthesis parameters and their effects on the physical properties... more This is a detailed study of the synthesis parameters and their effects on the physical properties and ionic conductivity of gadolinium-doped ceria prepared using a glycine nitrate precursor combustion method.

Research paper thumbnail of MnFe2O4: Synthesis, morphology and electrochemical properties

AIP Conference Proceedings, 2017

MnFe2O4 has been synthesized by simple ammonia assisted co-precipitation method to obtain nanocry... more MnFe2O4 has been synthesized by simple ammonia assisted co-precipitation method to obtain nanocrystalline powder. X-ray diffraction studies confirmed its crystallinity and phase purity. The MnFe2O4 calcined at 1000°C for 4 h has spinel crystal structure with Fd3m space group and lattice constant 8.511 A. The electrode was prepared by dip coating method on stainless steel substrate and fired at 600°C for 2 h. Random shape grains of 0.2 to 1.5 micron with pores of 1-2 micron dimensions were observed in SEM images. The electrochemical studies of MnFe2O4 were carried out with 1 mole Na2SO4 electrolyte. The MnFe2O4 electrode shows highest specific capacitance of 27.53 F.g−1 and interfacial capacitance of 0.83 F.cm−2.

Research paper thumbnail of Hausmannite Manganese oxide cathodes for supercapacitors: Surface Wettability and Electrochemical Properties

Electrochimica Acta, 2017

Highlights of paper: 1. Mn3O4 thick films by spray pyrolysis 2. Selection of electrolyte using Co... more Highlights of paper: 1. Mn3O4 thick films by spray pyrolysis 2. Selection of electrolyte using Contact Angle Measurement 3. Porous morphology of the films 4. Study of two important spray pyrolysis method parameters 5.

Research paper thumbnail of Oxygen ion conducting glass ceramic composites for high temperature sensor applications

2015 2nd International Symposium on Physics and Technology of Sensors (ISPTS), 2015

The present work is about preparation and characterization of high temperature oxygen sensing com... more The present work is about preparation and characterization of high temperature oxygen sensing composite material consisting of Gadolinium doped Ceria (GDC) together with a relatively low temperature melting, ionic conducting glass to facilitate lower sintering and operating temperature. This paper reports the physical and ionic conductivity properties of this sintered composite as a function of operating temperature.

Research paper thumbnail of Taguchi design of experiments for optimization of ionic conductivity in nanocrystalline Gadolinium doped Ceria

Ceramics International, 2015

Research paper thumbnail of Nanocrystalline Gadolinium doped Ceria (Ce<inf>0.8</inf>Gd<inf>0.2</inf>O<inf>3-δ</inf>) for oxygen sensor and solid oxide fuel cell applications

2012 1st International Symposium on Physics and Technology of Sensors (ISPTS-1), 2012

ABSTRACT Gadolinium doped Ceria (GDC) is a known oxygen ion conductor in intermediate temperature... more ABSTRACT Gadolinium doped Ceria (GDC) is a known oxygen ion conductor in intermediate temperature range. This is a preliminary work aimed at exploring the suitability of using nanocrystalline GDC as oxygen sensor in intermediate operating temperature range (500°C–700°C). The nanocrystalline Gadolinium doped Ceria (GDC) has been prepared by sol-gel method with EDTA as chelating agent. Particle size around 10±5nm was obtained after calcination at 600°C. Pellets prepared using this material were sintered 1350°C, which show 90% of the theoretical density. The dc and ac (1Hz–1MHz) conductivity of these pellet was measured in the temperature range 200–600°C and 500–700°C respectively. Highest conductivity of the order of 4.61X10−5 S/cm was recorded at 700°C. Possible reasons for low conductivity are discussed.

Research paper thumbnail of Oxygen ion transport through the electrolyte in Solid Oxide Fuel Cell

2013 International Conference on Renewable Energy Research and Applications (ICRERA), 2013

ABSTRACT The oxygen ion transport through the electrolyte of Solid Oxide Fuel Cells (SOFC&#39... more ABSTRACT The oxygen ion transport through the electrolyte of Solid Oxide Fuel Cells (SOFC&#39;s) has been studied in this work. The modeling with relevant validation with experimental data is explained. The temperature dependence of ion mobility and flux is also explored.

Research paper thumbnail of Sol–gel synthesis and protonic conductivity of yttrium doped barium cerate

Journal of Sol-Gel Science and Technology, 2014

ABSTRACT Proton ion conducting nanocrystalline yttrium doped barium cerate (BCYO) is synthesized ... more ABSTRACT Proton ion conducting nanocrystalline yttrium doped barium cerate (BCYO) is synthesized by EDTA-citric acid assisted sol-gel method. The effect of pH of the precursor on crystal structure, morphology and ionic conductivity is studied in pH range 6-11. The X-ray diffraction studies indicate that pure orthorhombic perovskite phase is obtained in acidic precursor pH of 6 at much lower calcination temperature (900 °C) than that reported earlier. Increase in pH causes formation of impurities, such as, BaCeO3, Ce(OH)2 and Ce0.8Y0.2O3 along with orthorhombic and monoclinic phases of BCYO. This deteriorates the sintered density and ionic conductivity of the samples. The sample prepared at pH 6 and sintered at 1,350 °C shows above 95 % of the theoretical density. Ionic conductivity of about 0.04 S cm−1 at 700 °C and activation energy of 0.16 ± 0.01 eV between 500-700 °C is obtained at pH 6, which are the best values reported for BCYO.