Investigations of Ni-SDC carbonate (Ni-SDCC) as composite anode for low temperature solid oxide fuel cells

Systematic research regarding NiO-SDC carbonate (NiO-SDCC) as composite anode is limited despite great chemical compatibility and cell performance achieved with other low temperature solid oxide fuel cell (LTSOFC) components. This study focuses to investigate the correlation...

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Main Author:	Ng, Kei Hoa
Format:	Thesis
Language:	English English English
Published:	2018
Subjects:	TK2896-2985 Production of electricity by direct energy conversion
Online Access:	http://eprints.uthm.edu.my/239/2/24p%20NG%20KEI%20HOA.pdf http://eprints.uthm.edu.my/239/3/NG%20KEI%20HOA%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/239/4/NG%20KEI%20HOA%20WATERMARK.pdf
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spelling	my-uthm-ep.2392021-07-13T03:21:21Z Investigations of Ni-SDC carbonate (Ni-SDCC) as composite anode for low temperature solid oxide fuel cells 2018-05 Ng, Kei Hoa TK2896-2985 Production of electricity by direct energy conversion Systematic research regarding NiO-SDC carbonate (NiO-SDCC) as composite anode is limited despite great chemical compatibility and cell performance achieved with other low temperature solid oxide fuel cell (LTSOFC) components. This study focuses to investigate the correlation of powder composition and calcination temperature on the chemical compatibility, morphologies, thermal and electrochemical performance of NiO-SDCC composite anode. NiO-SDCC composite powders with the weight ratios of 50:50 (NC55), 60:40 (NC64), and 70:30 (NC73) were achieved using high-energy ball-milling. All powders were calcined at 600–800 °C, pelletized and sintered at 600 °C. Characterisation include the crystalline phases, thermogravimetry, thermal expansion coefficient (TEC), hardness and morphologies were conducted. Electrochemical impedance spectroscopy (EIS) was conducted under in-situ reduction process. The powder and pellet morphologies, thermal expansion, and hardness were mostly affected by the calcination temperature as compared to powder composition. NC55 was selected for anode reduction process in hydrogen due for the least TEC values as compared to NC64 and NC73. The Ni-SDCC exhibited porosity of 36-40% after reduction process. The lowest area specific resistance of 5.3 Ωcm2 was achieved with sample calcined at 800 ℃. In this study, unexpected mechanical failure has been observed after EIS measurements. Therefore, chemical reactions and anode failure mechanisms were successfully proposed in this study. This mechanism is a new finding that has not been reported in previous studies and must be given appropriate attention. In conclusion, this study significantly contributes to the development of Ni-SDCC as LTSOFC composite anode. Further enhancement on this material is required on improved durability for LTSOFC application. 2018-05 Thesis http://eprints.uthm.edu.my/239/ http://eprints.uthm.edu.my/239/2/24p%20NG%20KEI%20HOA.pdf text en public http://eprints.uthm.edu.my/239/3/NG%20KEI%20HOA%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/239/4/NG%20KEI%20HOA%20WATERMARK.pdf text en validuser phd doctoral Universiti Tun Hussein Onn Malaysia Fakulti Kejuruteraan Mekanikal dan Pembuatan
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	TK2896-2985 Production of electricity by direct energy conversion
spellingShingle	TK2896-2985 Production of electricity by direct energy conversion Ng, Kei Hoa Investigations of Ni-SDC carbonate (Ni-SDCC) as composite anode for low temperature solid oxide fuel cells
description	Systematic research regarding NiO-SDC carbonate (NiO-SDCC) as composite anode is limited despite great chemical compatibility and cell performance achieved with other low temperature solid oxide fuel cell (LTSOFC) components. This study focuses to investigate the correlation of powder composition and calcination temperature on the chemical compatibility, morphologies, thermal and electrochemical performance of NiO-SDCC composite anode. NiO-SDCC composite powders with the weight ratios of 50:50 (NC55), 60:40 (NC64), and 70:30 (NC73) were achieved using high-energy ball-milling. All powders were calcined at 600–800 °C, pelletized and sintered at 600 °C. Characterisation include the crystalline phases, thermogravimetry, thermal expansion coefficient (TEC), hardness and morphologies were conducted. Electrochemical impedance spectroscopy (EIS) was conducted under in-situ reduction process. The powder and pellet morphologies, thermal expansion, and hardness were mostly affected by the calcination temperature as compared to powder composition. NC55 was selected for anode reduction process in hydrogen due for the least TEC values as compared to NC64 and NC73. The Ni-SDCC exhibited porosity of 36-40% after reduction process. The lowest area specific resistance of 5.3 Ωcm2 was achieved with sample calcined at 800 ℃. In this study, unexpected mechanical failure has been observed after EIS measurements. Therefore, chemical reactions and anode failure mechanisms were successfully proposed in this study. This mechanism is a new finding that has not been reported in previous studies and must be given appropriate attention. In conclusion, this study significantly contributes to the development of Ni-SDCC as LTSOFC composite anode. Further enhancement on this material is required on improved durability for LTSOFC application.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Ng, Kei Hoa
author_facet	Ng, Kei Hoa
author_sort	Ng, Kei Hoa
title	Investigations of Ni-SDC carbonate (Ni-SDCC) as composite anode for low temperature solid oxide fuel cells
title_short	Investigations of Ni-SDC carbonate (Ni-SDCC) as composite anode for low temperature solid oxide fuel cells
title_full	Investigations of Ni-SDC carbonate (Ni-SDCC) as composite anode for low temperature solid oxide fuel cells
title_fullStr	Investigations of Ni-SDC carbonate (Ni-SDCC) as composite anode for low temperature solid oxide fuel cells
title_full_unstemmed	Investigations of Ni-SDC carbonate (Ni-SDCC) as composite anode for low temperature solid oxide fuel cells
title_sort	investigations of ni-sdc carbonate (ni-sdcc) as composite anode for low temperature solid oxide fuel cells
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Fakulti Kejuruteraan Mekanikal dan Pembuatan
publishDate	2018
url	http://eprints.uthm.edu.my/239/2/24p%20NG%20KEI%20HOA.pdf http://eprints.uthm.edu.my/239/3/NG%20KEI%20HOA%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/239/4/NG%20KEI%20HOA%20WATERMARK.pdf
_version_	1747830561956691968

Investigations of Ni-SDC carbonate (Ni-SDCC) as composite anode for low temperature solid oxide fuel cells

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