Ammonia has been considered a promising alternative energy carrier due to its high hydrogen content and lack of carbon. Since ammonia readily decomposes into hydrogen and nitrogen at high temperatures, it can be used as a fuel for solid oxide fuel cells (SOFCs). In this work, the effect of the ammonia decomposition reaction over an anode on the performance of direct ammonia-fueled SOFCs was evaluated by electrochemical measurements and catalytic activity tests. A Ni–BaCe_0.4Zr_0.4Y_0.2O_3−δ cermet with excellent catalytic activity for ammonia decomposition was employed as the anode material. Impedance analyses revealed that the total cell resistance strongly depended on the ammonia fuel supply conditions. Particularly, the polarization resistance, which was attributed to a mass transfer process in the anode, increased at high ammonia concentrations and flow rates. On the other hand, in the catalytic activity tests, the conversion of ammonia over the cermet decreased under such fuel supply conditions. Hence, it was concluded that the performance of direct ammonia-fueled SOFCs significantly depended on the ammonia conversion over the anode. Additionally, a considerable reduction in the anode temperature as a result of the endothermic ammonia decomposition reaction was confirmed.

中文翻译：

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阳极上氨分解反应对直接用氨燃料燃烧的质子陶瓷燃料电池的影响

氨由于其高氢含量和缺乏碳而被认为是一种有前途的替代能源载体。由于氨在高温下容易分解成氢和氮，因此可以用作固体氧化物燃料电池（SOFC）的燃料。在这项工作中，通过电化学测量和催化活性测试评估了阳极上的氨分解反应对直接以氨为燃料的SOFC的性能的影响。Ni-BaCe _0.4 Zr _0.4 Y _0.2 O _{3− δ}将具有优异的氨分解催化活性的金属陶瓷用作负极材料。阻抗分析表明，总电池电阻在很大程度上取决于氨燃料的供应条件。特别地，归因于阳极中的传质过程的极化电阻在高氨浓度和流速下增加。另一方面，在催化活性测试中，在这种燃料供应条件下，在金属陶瓷上的氨转化率降低。因此，可以得出结论，直接以氨为燃料的SOFC的性能在很大程度上取决于阳极上的氨转化率。另外，证实了由于吸热氨分解反应而导致的阳极温度的显着降低。