Reactions of low concentration dry methane at Ni-YSZ anode in the SOFCs
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摘要: 向Ni-YSZ/YSZ/LSM（Ni-Y2O3稳定的ZrO/YSZ/La0.85Sr0.15MnO3-δ）电池阳极通入不同浓度的干甲烷，利用气相色谱对阳极尾气进行原位检测，研究在不同电流密度下，干甲烷在Ni-YSZ阳极上所发生的反应。通过理论开路电压和实测开路电压的比较、阳极尾气的定量分析以及CH4在Ni基阳极上基元反应活化能分析，发现操作温度1000℃时，3.85%和5.66%甲烷为燃料的Ni-YSZ阳极电池，在电流密度由低到高的过程中，甲烷在Ni-YSZ阳极上顺序发生部分氧化反应、CH4+2O2- → CO+H2O+H2+4e-、CH4+3O2- → CO+2H2O+6e-和完全氧化反应。随着后续反应的相继发生，前面的反应速率逐渐减小。Abstract: Dry methane with various concentrations was directly entered the anode of the solid oxide fuel cells (SOFCs) of Ni-YSZ/YSZ/LSM（Ni-Y2O3 stabilized ZrO/YSZ/La0.85Sr0.15MnO3-δ）. The exhaust gases from anode were measured in-situ by gas chromatograph (GC) to study the reactions of dry methane under different current densities at the Ni-YSZ anodes. The reactions were determined by comprising the theoretical open-circuit voltage (OCV) to the measured one, analyzing quantitatively the exhaust gas and the activation energy of elementary reactions occurred to CH4 at the Ni-YSZ anodes. At 1000℃ oxidation of methane was found to take place in sequence from partial oxidation, CH4+2O2- → CO+H2O+H2+4e-， CH4+3O2- → CO+2H2O+6e- to complete oxidation with increasing current density at the Ni-YSZ anodes under 3.85% and 5.66% CH4 conditions.
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Key words:
- solid oxide fuel cell /
- anode /
- methane /
- reaction
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