Internal Reforming of SOFCs Carbon Deposition on Fuel Electrode and Subsequent Deterioration of Cell
Internal Reforming of SOFCs Carbon Deposition on Fuel Electrode and Subsequent Deterioration of Cell
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DOI：
10.1149/1.2405837
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发表时间：
2007-02
影响因子：
3.9
通讯作者：
Tatsuya Iida;M. Kawano;T. Matsui;R. Kikuchi;K. Eguchi
中科院分区：
文献类型：
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作者：
Tatsuya Iida;M. Kawano;T. Matsui;R. Kikuchi;K. Eguchi
研究了几种用于固体氧化物燃料电池直接内重整反应的金属陶瓷阳极材料。考察了以丙烷为烃类燃料的内重整操作中蒸汽和排放条件的影响。即使在高的蒸汽-碳（S/C）比下，在1000°C下用丙烷的内部重整操作期间，用Ni-氧化钇稳定的氧化锆（YSZ）的发电特性也劣化，这可能是由于在低电流密度下的碳形成，而对于具有Ni-氧化钪稳定的氧化锆（ScSZ）或Ni-氧化钐掺杂的氧化铈（SDC）阳极的电池，通过在低S/C = 0.8.用重量法测定了几种金属陶瓷阳极材料在通入干燥或加湿甲烷时的积碳速率。Ni-ScSZ上的碳沉积速率低于Ni-YSZ，从而导致在低S/C下与丙烷的更好的发电性能。Ni-SDC在所研究的金属陶瓷中显示出最高的碳沉积速率，即使对于潮湿的甲烷。这意味着在Ni-SDC上形成的碳可以在发电时有效地去除。
Several cermet anode materials were investigated for direct internal reforming operation of solid oxide fuel cells. The effects of steam and discharge conditions were examined for internal reforming operation with propane as a hydrocarbon fuel. Even at high steam-to-carbon (S/C) ratio, power generation characteristics with Ni-yttria-stabilized zirconia (YSZ) were deteriorated during internal reforming operation with propane at 1000°C, possibly due to carbon formation at low current densities, whereas stable generation behavior was observed for the cells with Ni-scandia-stabilized zirconia (ScSZ) or Ni-samaria-doped ceria (SDC) anode by feeding propane at low S/C = 0.8. The carbon deposition rate was measured for several cermet anode materials by feeding dry or humidified methane by the gravimetric technique. The carbon deposition rate over Ni-ScSZ was lower than Ni-YSZ, leading to better generation performance with propane at low S/C. Ni-SDC showed the highest carbon deposition rate among the cermets investigated, even for humidified methane. This implies that carbon formed over Ni-SDC could be effectively removed upon power generation.