Synthesis and characterization of lanthanum cobaltite based cathode material for potential application in proton conducting fuel cell / Abdullah Abdul Samat

Synthesis and characterization of lanthanum cobaltite based cathode material for potential application in proton conducting fuel cell / Abdullah Abdul Samat

Proton conducting fuel cell (PCFC) is a device that converts chemical energy directly into electrical energy via electrochemical processes. Currently, one of the targets to boost the commercialization of this device is by lowering the current high operating temperatures (800 - 1000 °C) to intermedia...

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Main Author: Abdul Samat, Abdullah
Format: Thesis
Language:English
Published: 2014
Online Access:http://ir.uitm.edu.my/id/eprint/17379/
http://ir.uitm.edu.my/id/eprint/17379/2/TM_ABDULLAH%20ABDUL%20SAMAT%20AS%2014_5.pdf
id uitm-17379
recordtype eprints
spelling uitm-173792018-10-25T02:02:35Z http://ir.uitm.edu.my/id/eprint/17379/ Synthesis and characterization of lanthanum cobaltite based cathode material for potential application in proton conducting fuel cell / Abdullah Abdul Samat Abdul Samat, Abdullah Proton conducting fuel cell (PCFC) is a device that converts chemical energy directly into electrical energy via electrochemical processes. Currently, one of the targets to boost the commercialization of this device is by lowering the current high operating temperatures (800 - 1000 °C) to intermediate temperatures (IT) (500 - 800 °C). However, at reduced temperatures, the device has performed a high interfacial polarization resistance (Rp) at cathode|electrolyte interface. In this work, strontium-doped lanthanum cobaltite, La₀.₆Sr₀.₄CoO3-δ(LSC064) was chosen as cathode material as it has shown a good performance at IT. The LSC064 powder was synthesized via polymeric complexing method using metal nitrate salts as precursor material. The calcined LSC064 powder was transformed to cathode slurries which have been prepared using four different electrode binders namely ethyl cellulose (EC), polyvinyl alcohol (PVA), polyvinyl butyral (PVB) and polyvinyl pyrrolidone (PVP). These slurries were separately painted on pellet surfaces of yttrium-doped barium cerate-zirconate, BaCe₀.₅₄Zr₀.₃₆Y₀.₁O₂.₉₅ (BCZY64) electrolyte to produce half-cell of LSC064|BCZY64|LSC064. The obtained powders and fabricated half-cells were respectively characterized by employing Thermogravimetric Analysis (TGA), Fourier Transform Infrared (FTIR) Spectroscopy, X-ray Diffractometry (XRD), Scanning Electron Micrsocopy/Electron Dispersive X-ray Spectrometry (SEM/EDS) and Electrochemical Impedance Spectroscopy (EIS). The TGA results showed the lowest total weight loss, WTL (-86%) and the lowest thermal decomposition temperature, Ttd (600 °C) were recorded at heating rates of 5 °C min¯¹ and 2 °C min¯¹, accordingly. The XRD and SEM analysis revealed that a single perovskite phase of LSC064 with small particle size (~130 - 260 nm), respectively was obtained at calcination temperature of 800 °C with heating/cooling rate of 5 °C min¯¹. The presence or absence of carbonyl compounds at -1600 cm¯¹ and -860 cm¯¹and metal-oxide (M-O) bond at 700 - 400 cm¯¹ after heat treatment was proven by the FTIR. SEM micrographs at cross-sectional view of the prepared cells with different electrode binders showed there were three areas corresponding to the LSC064, BCZY64 and LSC064|BCZY64 interface with or without crack: and/or hole. Among all the electrode binders, only PVP has aided to form a good contact between the LSC064 and BCZY64 with no formation of crack and/or hole at LSC064|BCZY64 interface region. The elemental atomic percentage of elements at the interface region of the cell prepared with the PVP such as lanthanum, La (3.16%), barium, Ba (9.52%) and cerium, Ce (6.02%) was detected by EDS. The EIS results showed the Rp values in terms of area specific resistance (ASR) decreased as temperatures increased from 400 °C to 800 °C. A relatively low Rp of 0.48 Ω cm² at 700 °C indicates that the LSC064 is a promising cathode material for the PCFC at intermediate temperatures. 2014 Thesis NonPeerReviewed text en http://ir.uitm.edu.my/id/eprint/17379/2/TM_ABDULLAH%20ABDUL%20SAMAT%20AS%2014_5.pdf Abdul Samat, Abdullah (2014) Synthesis and characterization of lanthanum cobaltite based cathode material for potential application in proton conducting fuel cell / Abdullah Abdul Samat. Masters thesis, Universiti Teknologi MARA.
repository_type Digital Repository
institution_category Local University
institution Universiti Teknologi MARA
building UiTM Institutional Repository
collection Online Access
language English
description Proton conducting fuel cell (PCFC) is a device that converts chemical energy directly into electrical energy via electrochemical processes. Currently, one of the targets to boost the commercialization of this device is by lowering the current high operating temperatures (800 - 1000 °C) to intermediate temperatures (IT) (500 - 800 °C). However, at reduced temperatures, the device has performed a high interfacial polarization resistance (Rp) at cathode|electrolyte interface. In this work, strontium-doped lanthanum cobaltite, La₀.₆Sr₀.₄CoO3-δ(LSC064) was chosen as cathode material as it has shown a good performance at IT. The LSC064 powder was synthesized via polymeric complexing method using metal nitrate salts as precursor material. The calcined LSC064 powder was transformed to cathode slurries which have been prepared using four different electrode binders namely ethyl cellulose (EC), polyvinyl alcohol (PVA), polyvinyl butyral (PVB) and polyvinyl pyrrolidone (PVP). These slurries were separately painted on pellet surfaces of yttrium-doped barium cerate-zirconate, BaCe₀.₅₄Zr₀.₃₆Y₀.₁O₂.₉₅ (BCZY64) electrolyte to produce half-cell of LSC064|BCZY64|LSC064. The obtained powders and fabricated half-cells were respectively characterized by employing Thermogravimetric Analysis (TGA), Fourier Transform Infrared (FTIR) Spectroscopy, X-ray Diffractometry (XRD), Scanning Electron Micrsocopy/Electron Dispersive X-ray Spectrometry (SEM/EDS) and Electrochemical Impedance Spectroscopy (EIS). The TGA results showed the lowest total weight loss, WTL (-86%) and the lowest thermal decomposition temperature, Ttd (600 °C) were recorded at heating rates of 5 °C min¯¹ and 2 °C min¯¹, accordingly. The XRD and SEM analysis revealed that a single perovskite phase of LSC064 with small particle size (~130 - 260 nm), respectively was obtained at calcination temperature of 800 °C with heating/cooling rate of 5 °C min¯¹. The presence or absence of carbonyl compounds at -1600 cm¯¹ and -860 cm¯¹and metal-oxide (M-O) bond at 700 - 400 cm¯¹ after heat treatment was proven by the FTIR. SEM micrographs at cross-sectional view of the prepared cells with different electrode binders showed there were three areas corresponding to the LSC064, BCZY64 and LSC064|BCZY64 interface with or without crack: and/or hole. Among all the electrode binders, only PVP has aided to form a good contact between the LSC064 and BCZY64 with no formation of crack and/or hole at LSC064|BCZY64 interface region. The elemental atomic percentage of elements at the interface region of the cell prepared with the PVP such as lanthanum, La (3.16%), barium, Ba (9.52%) and cerium, Ce (6.02%) was detected by EDS. The EIS results showed the Rp values in terms of area specific resistance (ASR) decreased as temperatures increased from 400 °C to 800 °C. A relatively low Rp of 0.48 Ω cm² at 700 °C indicates that the LSC064 is a promising cathode material for the PCFC at intermediate temperatures.
format Thesis
author Abdul Samat, Abdullah
spellingShingle Abdul Samat, Abdullah
Synthesis and characterization of lanthanum cobaltite based cathode material for potential application in proton conducting fuel cell / Abdullah Abdul Samat
author_facet Abdul Samat, Abdullah
author_sort Abdul Samat, Abdullah
title Synthesis and characterization of lanthanum cobaltite based cathode material for potential application in proton conducting fuel cell / Abdullah Abdul Samat
title_short Synthesis and characterization of lanthanum cobaltite based cathode material for potential application in proton conducting fuel cell / Abdullah Abdul Samat
title_full Synthesis and characterization of lanthanum cobaltite based cathode material for potential application in proton conducting fuel cell / Abdullah Abdul Samat
title_fullStr Synthesis and characterization of lanthanum cobaltite based cathode material for potential application in proton conducting fuel cell / Abdullah Abdul Samat
title_full_unstemmed Synthesis and characterization of lanthanum cobaltite based cathode material for potential application in proton conducting fuel cell / Abdullah Abdul Samat
title_sort synthesis and characterization of lanthanum cobaltite based cathode material for potential application in proton conducting fuel cell / abdullah abdul samat
publishDate 2014
url http://ir.uitm.edu.my/id/eprint/17379/
http://ir.uitm.edu.my/id/eprint/17379/2/TM_ABDULLAH%20ABDUL%20SAMAT%20AS%2014_5.pdf
first_indexed 2023-09-18T22:58:11Z
last_indexed 2023-09-18T22:58:11Z
_version_ 1777417994761142272

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