Enhanced coking resistance of a Ni cermet anode by a chromates protective layer
|Chang, H. and Chen, H. and Yang, G. and Zhou, W. and Bai, J. and Li, S. and Shao, Z. 2019. Enhanced coking resistance of a Ni cermet anode by a chromates protective layer. Journal of Energy Chemistry. 37: pp. 117-125.
Ni-based anodes of SOFCs are susceptible to coking, which greatly limits practical application of direct methane-based fuels. An indirect internal reformer is an effective way to convert methane-based fuels into syngas before they reach anode. In this work, catalytic activity of a redox-stable perovskite La0.7Sr0.3Cr0.8Fe0.2O3-d (LSCrFO) for methane conversion was evaluated. The catalyst was fabricated as an anodic protective layer to improve coking resistance of a Ni cermet anode. Using wet CH4 as a fuel, the LSCrFO-modified cell showed excellent power output and good coking resistance with peak power density of 1.59 W cm-2 at 800 °C. The cell demonstrated good durability lasting for at least 100 h. While the bare cell without the protective layer showed poor durability with the cell voltage fast dropped from 0.75 V to 0.4 V within 30 min. Under wet coal bed methane (CBM) operation, obvious performance degradation within 35 h (1.7 mV h-1) was observed due to the influence of heavy carbon compounds in CBM. The pre- and post-mortem microstructures and carbon analysis of the anode surface and catalyst surface were further conducted.
|Enhanced coking resistance of a Ni cermet anode by a chromates protective layer
|Journal of Energy Chemistry
|WASM: Minerals, Energy and Chemical Engineering (WASM-MECE)
|Fulltext not available
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