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Durability test of SOFC cathodes

机译:SOFC阴极的耐久性测试

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The durability of solid oxide fuel cell (SOFC) composite cathodes of lanthanum strontium manganite and yttria stabilised zirconia was investigated. The cathodes were kept at constant, realistic operating conditions (-300 mA cm(-2) at 1000 degrees C in air) for up to 2000 h. After the 2000 h test the increase in electrode overvoltage exceeded 100% of the initial value. Nominally identical cathodes kept for 2000 h at 1000 degrees C in air without current load for comparison showed little or no degradation. Thus, the current load of -300 mA cm(-)2, rather than the operation temperature of 1000 degrees C, was responsible for the degradation. Structural analysis showed an increase in the porosity at the electrode interfaces, when the electrode had been polarised. No such structural changes were found for electrodes tested without current load. The degradation is primarily ascribed to pore formation in the electrode material induced by an electric field. [References: 22]
机译:研究了镧锶锰锰和氧化钇稳定的氧化锆的固体氧化物燃料电池(SOFC)复合阴极的耐久性。将阴极保持在恒定的实际操作条件下(在空气中1000摄氏度下为-300 mA cm(-2))长达2000 h。在2000小时的测试后,电极过电压的增加超过了初始值的100%。在没有电流负载的情况下,名义上相同的阴极在空气中于1000摄氏度下保持2000小时,几乎没有降解或没有降解。因此,-300 mA cm(-)2的电流负载而不是1000摄氏度的工作温度是造成这种降解的原因。结构分析表明,当电极极化后,电极界面的孔隙率会增加。对于没有电流负载的测试电极,没有发现这种结构变化。降解主要归因于由电场引起的电极材料中的孔形成。 [参考:22]

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