Dynamic Evaluation of low-temperature metal-supported solid oxide fuel cell oriented to Auxilliary Power Units
| Autor: | Sing Yick, Dave Ghosh, Radenka Maric, Jörg Oberste Berghaus, Zhenwei Wang, Rob Hui, Wei Qu, Cyrille Decès-Petit |
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| Jazyk: | angličtina |
| Rok vydání: | 2008 |
| Předmět: |
plasma spray
Materials science Renewable Energy Sustainability and the Environment Metallurgy Energy Engineering and Power Technology low-temperature Electrolyte Cermet Cathode Anode law.invention Chemical engineering law Hydrogen fuel solid oxide fuel cell dynamic evaluation Solid oxide fuel cell Electrical and Electronic Engineering Physical and Theoretical Chemistry Thermal spraying metal-supported Power density |
| Popis: | A metal-supported solid oxide fuel cell (SOFC) composed of a Ni–Ce0.8Sm0.2O2−δ (Ni–SDC) cermet anode and an SDC electrolyte was fabricated by suspension plasma spraying on a Hastelloy X substrate. The cathode, an Sm0.5Sr0.5CoO3 (SSCo)–SDC composite, was screen-printed and fired in situ. The dynamic behaviour of the cell was measured while subjected to complete fuel shutoff and rapid start-up cycles, as typically encountered in auxiliary power units (APU) applications. A promising performance – with a maximum power density (MPD) of 0.176 W cm−2 at 600 °C – was achieved using humidified hydrogen as fuel and air as the oxidant. The cell also showed excellent resistance to oxidation at 600 °C during fuel shutoff, with only a slight drop in performance after reintroduction of the fuel. The Cr and Mn species in the Hastelloy X alloy appeared to be preferentially oxidized while the oxidation of nickel in the metallic substrate was temporarily alleviated. In rapid start-up cycles with a heating rate of 60 °C min−1, noticeable performance deterioration took place in the first two thermal cycles, and then continued at a much slower rate in subsequent cycles. A postmortem analysis of the cell suggested that the degradation was mainly due to the mismatch of the thermal expansion coefficient across the cathode/electrolyte interface. |
| Databáze: | OpenAIRE |
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