Structure and properties of cathode and electrolyte for intermediate temperature solid oxide fuel cells (IT-SOFCS)

Solid oxide fuel cell (SOFCs) is a device that used to convert from chemical energy to electrical energy. The aim of this thesis is to evaluate the correlation of structure and properties of electrode and electrolyte materials that were used for ITSOFCs. The positive electrode (cathode) materials w...

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Format:	Thesis
Language:	English
Subjects:	Solid oxide fuel cells Electrolytes Fuel cell
Online Access:	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72438/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72438/2/Full%20text.pdf
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spelling	my-unimap-724382021-10-14T01:44:25Z Structure and properties of cathode and electrolyte for intermediate temperature solid oxide fuel cells (IT-SOFCS) Mohd Sobri, Idris, Dr. Solid oxide fuel cell (SOFCs) is a device that used to convert from chemical energy to electrical energy. The aim of this thesis is to evaluate the correlation of structure and properties of electrode and electrolyte materials that were used for ITSOFCs. The positive electrode (cathode) materials with the composition of Ba0.5Sr0.5Co0.8-yFe0.2+yO3-δ (0 > y > 0.8) were prepared using combined EDTA citrate complexing method. Phase pure samples were obtained after the samples were heated at 900oC for 15 hours with intermittence grindings. X-ray diffraction (XRD) showed that all samples were formed full solid solution between both end-members with a cubic symmetry and the space group of Pm-3m. Furthermore, the crystal structure remained stable after heated up to 1100oC in air. Then, Rietveld refinements were performed to evaluate structural changes on the crystal symmetry by reducing cobalt contents in Ba0.5Sr0.5Co0.8-yFe0.2+yO3-δ. Results indicated that reducing Co contents decreased the lattice parameters and unit cell volume. Fe cation was remained at the 1b-site with the octahedral coordination. On the other hand, electrolyte material with the composition of Ce0.8Sm0.2O1.9 was prepared using conventional solid-state synthesis route. The prepared Ce0.8Sm0.2O1.9 was compared with the commercial sample to determine their structure, electrical properties, and grain size. Results show that the lattice parameters and unit cell volume of the prepared and commercial Ce0.8Sm0.2O1.9 were similar within errors. But crystallite size (using Scherrer‟s formula) and grain size (SEM micrograph) of the commercial Ce0.8Sm0.2O1.9 were relatively smaller than the prepared sample. Furthermore, the measured electrical conductivities of commercial and prepared Ce0.8Sm0.2O1.9 were 7 x 10-2 and 2 x 10-2 Scm-1at 600oC, respectively. The structure of commercial and prepared Ce0.8Sm0.2O1.9 are similar, however, electrical properties of commercial Ce0.8Sm0.2O1.9 is relatively much better than prepared Ce0.8Sm0.2O1.9. On the other hand, the electrochemical performance of in-house prepared half-cell Ba0.5Sr0.5Co0.4Fe0.6O3-δ \| Ce0.8Sm0.2O1.9 \| Ba0.5Sr0.5Co0.4Fe0.6O3-δ shows the lowest Area Specific Resistance (ASR) about 0.1257 ῼcm2 at 600oC. Universiti Malaysia Perlis (UniMAP) Thesis en http://dspace.unimap.edu.my:80/xmlui/handle/123456789/72438 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72438/3/license.txt 8a4605be74aa9ea9d79846c1fba20a33 http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72438/1/Page%201-24.pdf 50dd292f2a3d5160319bea41e6c41a0e http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72438/2/Full%20text.pdf edc198e6d01e8704a10b11edcdeb7c79 Universiti Malaysia Perlis (UniMAP) Solid oxide fuel cells Electrolytes Fuel cell School of Materials Engineering
institution	Universiti Malaysia Perlis
collection	UniMAP Institutional Repository
language	English
advisor	Mohd Sobri, Idris, Dr.
topic	Solid oxide fuel cells Electrolytes Fuel cell
spellingShingle	Solid oxide fuel cells Electrolytes Fuel cell Structure and properties of cathode and electrolyte for intermediate temperature solid oxide fuel cells (IT-SOFCS)
description	Solid oxide fuel cell (SOFCs) is a device that used to convert from chemical energy to electrical energy. The aim of this thesis is to evaluate the correlation of structure and properties of electrode and electrolyte materials that were used for ITSOFCs. The positive electrode (cathode) materials with the composition of Ba0.5Sr0.5Co0.8-yFe0.2+yO3-δ (0 > y > 0.8) were prepared using combined EDTA citrate complexing method. Phase pure samples were obtained after the samples were heated at 900oC for 15 hours with intermittence grindings. X-ray diffraction (XRD) showed that all samples were formed full solid solution between both end-members with a cubic symmetry and the space group of Pm-3m. Furthermore, the crystal structure remained stable after heated up to 1100oC in air. Then, Rietveld refinements were performed to evaluate structural changes on the crystal symmetry by reducing cobalt contents in Ba0.5Sr0.5Co0.8-yFe0.2+yO3-δ. Results indicated that reducing Co contents decreased the lattice parameters and unit cell volume. Fe cation was remained at the 1b-site with the octahedral coordination. On the other hand, electrolyte material with the composition of Ce0.8Sm0.2O1.9 was prepared using conventional solid-state synthesis route. The prepared Ce0.8Sm0.2O1.9 was compared with the commercial sample to determine their structure, electrical properties, and grain size. Results show that the lattice parameters and unit cell volume of the prepared and commercial Ce0.8Sm0.2O1.9 were similar within errors. But crystallite size (using Scherrer‟s formula) and grain size (SEM micrograph) of the commercial Ce0.8Sm0.2O1.9 were relatively smaller than the prepared sample. Furthermore, the measured electrical conductivities of commercial and prepared Ce0.8Sm0.2O1.9 were 7 x 10-2 and 2 x 10-2 Scm-1at 600oC, respectively. The structure of commercial and prepared Ce0.8Sm0.2O1.9 are similar, however, electrical properties of commercial Ce0.8Sm0.2O1.9 is relatively much better than prepared Ce0.8Sm0.2O1.9. On the other hand, the electrochemical performance of in-house prepared half-cell Ba0.5Sr0.5Co0.4Fe0.6O3-δ \| Ce0.8Sm0.2O1.9 \| Ba0.5Sr0.5Co0.4Fe0.6O3-δ shows the lowest Area Specific Resistance (ASR) about 0.1257 ῼcm2 at 600oC.
format	Thesis
title	Structure and properties of cathode and electrolyte for intermediate temperature solid oxide fuel cells (IT-SOFCS)
title_short	Structure and properties of cathode and electrolyte for intermediate temperature solid oxide fuel cells (IT-SOFCS)
title_full	Structure and properties of cathode and electrolyte for intermediate temperature solid oxide fuel cells (IT-SOFCS)
title_fullStr	Structure and properties of cathode and electrolyte for intermediate temperature solid oxide fuel cells (IT-SOFCS)
title_full_unstemmed	Structure and properties of cathode and electrolyte for intermediate temperature solid oxide fuel cells (IT-SOFCS)
title_sort	structure and properties of cathode and electrolyte for intermediate temperature solid oxide fuel cells (it-sofcs)
granting_institution	Universiti Malaysia Perlis (UniMAP)
granting_department	School of Materials Engineering
url	http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72438/1/Page%201-24.pdf http://dspace.unimap.edu.my:80/xmlui/bitstream/123456789/72438/2/Full%20text.pdf
_version_	1747836867092414464

Structure and properties of cathode and electrolyte for intermediate temperature solid oxide fuel cells (IT-SOFCS)

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