| Characterization of Spherical NiO-YSZ Anode Composites for Solid Oxide Fuel Cells Synthesized by Ultrasonic Spray Pyrolysis |
| Chae-Hyun Lim, Ki-Tae Lee1 |
Division of Advanced Materials Engineering, Chonbuk National University
1Hydrogen and Fuel Cell Research Center, Chonbuk National University |
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| ABSTRACT |
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Spherical NiO-YSZ particles were synthesized by ultrasonic spray pyrolysis (USP). The morphology of the synthesized particles can be modified by controlling parameters such as precursor pH, carrier-gas flow-rate, and temperature of the heating zone. The synthesized spherical NiO-YSZ particles have rough surface morphology at high carrier-gas flow-rates due to rapid gas exhaustion and insufficient particle ordering. The Ni-YSZ cermet anode synthesized by ultrasonic spray pyrolysis at a flow rate of l L/min, with precursor solution at pH4, showed a higher maximum power density of 256 $mW/cm^2$ compared to a conventionally mixed Ni-YSZ anode (185 $mW/cm^2$) at $800^{circ}C$. While the area-specific resistance of conventionally mixed Ni-YSZ anodes increases gradually with operation time (indicating performance degradation), the Ni-YSZ anode synthesized by USP does not exhibit any performance degradation, even after 500 h. |
| Key words:
Solid oxide fuel cell, Anode material, Ultrasonic spray pyrolysis, Electrochemical performance, Long-term stability |
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