Influence of silver addition on the morphological and thermal characteristics of nickel oxide-samarium doped ceria carbonate (NiO-SDCC) composite anode
Addition of silver (Ag) as an electro-catalyst has been widely investigated to enhance the cathode performance for intermediate-to-low temperature solid oxide fuel cells. Ag is seldom incorporated into composite anode materials, especially for low temperature application. Therefore, this study aimed...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
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UTHM Publisher
2018
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/5040/ http://eprints.uthm.edu.my/5040/1/AJ%202018%20%28486%29.pdf |
| Summary: | Addition of silver (Ag) as an electro-catalyst has been widely investigated to enhance the cathode performance for intermediate-to-low temperature solid oxide fuel cells. Ag is seldom incorporated into composite anode materials, especially for low temperature application. Therefore, this study aimed to investigate the effects of a small amount of Ag on the microstructure and thermal behaviour of nickel oxidesamarium-doped ceria carbonate (NiOSDCC) composite pellets. A high-speed ball milling technique was employed to prepare the NiOSDCC composite anode powder. Subsequently, a small amount of Ag (1, 3, and 5 wt.%) was added into NiOSDCC composite powder via ball milling. The pellets were manually pressed and sintered at 600 °C. Characterisation of the composite anodes included X-ray diffraction, Fourier transform infrared spectroscopy (FTIR), energy-dispersive spectroscopy, scanning electron microscopy, dilatometry and porosity measurement. NiOSDCC maintained good chemical compatibility regardless of Ag loading. FTIR analysis also verified the presence of carbonates, suggesting that Ag did not influence the carbonate bonding in all NiOSDCC. The porosity of all composite anodes was maintained within the satisfactory level for good anode performance (20%40%). The thermal expansion of the composite samples matched well with the SDCC electrolyte. This finding indicated that the addition of small Ag loading into NiOSDCC was within the acceptable range, demonstrating promising potential as low-temperature solid oxide fuel cell composite anode |
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