Three-dimensional non-isothermal modeling of a phosphoric acid-doped polybenzimidazole (PBI) membrane fuel cell
Three-dimensional non-isothermal modeling of a phosphoric acid-doped polybenzimidazole (PBI) membrane fuel cell
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DOI：
10.1016/j.ssi.2012.02.031
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发表时间：
2012-10-04
影响因子：
3.2
通讯作者：
Ju, Hyunchul
中科院分区：
文献类型：
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作者：
Chippar, Purushothama;Ju, Hyunchul
建立了含磷酸掺杂聚苯并咪唑(PBI)膜的高温质子交换膜燃料电池(HT-PEMFC)的三维非等温模型，对以往高温质子交换膜燃料电池(HT-PEMFC)建模和仿真研究中未考虑的关键热学因素进行了数值研究。重点分析了沿冷却剂流动路径的温度梯度的影响，这代表了一个典型的用于住宅应用的大规模高温质子交换膜燃料电池堆的热环境。我们的模拟结果表明，较低的冷却剂流量和由此产生的较高的下游温度升高增强了氧还原反应(ORR)动力学和质子电导率，从而导致更高的电池整体性能。此外，通过数值研究，阐明了高温质子交换膜燃料电池中特定位置的热源项及其对整体能量平衡的贡献。研究发现，在高温质子交换膜燃料电池中，阴极催化层中的不可逆反应热是产生热量的主要原因，在高电流密度下，欧姆焦耳加热的影响更为显著。(C)2012爱思唯尔B.V.保留所有权利。
A three-dimensional non-isothermal model for a high temperature proton exchange membrane fuel cell (HT-PEMFC) with phosphoric acid-doped polybenzimidazole (PBI) membranes is developed to numerically investigate key thermal aspects that were not considered in previous HT-PEMFC modeling and simulation studies. Particular emphasis is placed on analyzing the effect of the thermal gradient along the coolant flow path, which represents a more realistic thermal environment for a typical large-scale HT-PEMFC stack for residential applications. Our simulation results reveal that a lower coolant flow rate and resultant higher temperature rise toward downstream enhance oxygen reduction reaction (ORR) kinetics and proton conductivity, leading to higher overall cell performance. In addition, location-specific heat source terms in the HT-PEMFCs and their contributions to the overall energy balance are clarified using a numerical study. We found that the irreversible reaction heat in the cathode catalyst layer is the major contributor to heat generation in a HT-PEMFC, and the effect of ohmic joule heating becomes significant under high current density operation. (C) 2012 Elsevier B.V. All rights reserved.