两种不同阳极材料SOFC的性能及阳极反应机制

Study on performance and reaction mechanism of SOFC with different anodes

简述了两种不同燃料电池Ｐｔ｜ＹＳＺ｜Ａｇ和Ｐｔ｜ＹＳＺ｜Ｎｉ／ＹＳＺ燃料的研制，并测试了这两种电池的开路电压随运行温度的变化关系。实验表明，随温度的升高，开路电压的增长表现出阶段性增加，且其增长速率与所采用的电极材料有直接的关系。从材料的结构和性能分析这两种燃料电池的不同阳极材料的反应机制，认为对于采用电子型导电阳极Ａｇ的Ｐｔ｜ＹＳＺ｜Ａｇ燃料电池，其电化反应区域主要在三相界面（Ａｇ电极／电解质／气体）；而对于采用具有电子－离子混合导电能力阳极的Ｐｔ｜ＹＳＺ｜Ｎｉ／ＹＳＺ燃料电池，其电化反应区除三相界面外，还将扩展到两相界面（电极／气体），且这种混合导电的电极能改善电池的性能。

Two kinds of fuel cells,Pt|YSZ|Ag and Pt|YSZ|Ni/YSZ,were fabricated.The relationship between open circuit voltage and temperature was also investigated.The increasing of open circuit voltage with the increasing of temperature is different at different temperature regions and is related to the various anodes.The conducting mechanism for two kinds of anodes were analyzed from the material structure and their conducting properties.The area of electrode reaction is mainly three phase interface between the electrode,electrolyte and gas for electronic conductor Ag, while the reaction areas of the mixed conductor include not only the three phase interface but also two phase interface between the elctrode and gas.The SOFC’s performance of mixed electronic and ionic conductor anode is better than that of electronic conductor anode.