Numerical Analysis of the Local Current Efficiency Distribution in a Protonic Ceramic Fuel Cell Considering Gas Concentration Distributions
Numerical Analysis of the Local Current Efficiency Distribution in a Protonic Ceramic Fuel Cell Considering Gas Concentration Distributions
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考虑气体浓度分布的质子陶瓷燃料电池局部电流效率分布的数值分析
DOI：
10.1149/10301.0853ecst
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发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Mori Masashi
中科院分区：
文献类型：
--
作者：
Li Kunpeng;Suito Fumiyasu;Ryogo Takatera;Atsuhito Ota;Araki Takuto;Okuyama Yuji;Mori Masashi
中温质子陶瓷燃料电池（pcfc）由于其在电解质中具有较高的质子导电性，有望成为一种高效的能量转换器件。然而，除了主要的质子导电性外，其他一些载流子，如电子空穴，在pcfc中也具有导电性，导致电流效率下降。电导率不仅受工作温度的影响，还受气体浓度的强烈影响，这使得PCFC性能变得复杂。为了揭示其性能，并对考虑反应过电位的操作条件选择提供反馈，成功地使用准二维Nernst-Planck-Poisson （NPP）数值模型研究了含有BaZr0的平面型PCFC电解质中的电流效率分布。8 yb0。2 o3 -δ(BZYb20)。研究还揭示了气流方向的影响。结果表明，共流和逆流的平均电流效率几乎相同，但逆流的质子分布是平坦的。
Intermediate-temperature protonic ceramic fuel cells (PCFCs) are expected to be highly efficient energy conversion devices because of their high proton conductivity in the electrolyte. However, besides the main proton conductivity, some other charge carriers, such as electron holes, are also conductive in PCFCs, leading to a decrease in current efficiency. The conductivities are not only affected by the operating temperature but are also strongly influenced by the gas concentrations, which causes complexities in PCFC performance. To reveal the performance and provide feedback to the operating condition selections considering the reaction overpotential, a quasi-two-dimensional Nernst-Planck-Poisson (NPP) numerical model was successfully used to investigate the current efficiency distribution in a planar-type PCFC electrolyte with BaZr0. 8Yb0. 2O3-δ (BZYb20). The influence of the gas flow direction was also revealed in the present study. The results showed almost the same average current efficiency with co-and counterflows but flat proton distributions with counter-flows.