Three-dimensional non-isothermal modeling of carbon monoxide poisoning in high temperature proton exchange membrane fuel cells with phosphoric acid doped polybenzimidazole membranes

被引:80
作者
Jiao, Kui [1 ]
Alaefour, Ibrahim E. [1 ]
Li, Xianguo [1 ]
机构
[1] Univ Waterloo, Dept Mech & Mechatron Engn, Waterloo, ON N2L 3G1, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
CO poisoning; High temperature proton exchange membrane fuel cell; Model; Acid doped polybenzimidazole membrane; Performance degradation; POLYMER ELECTROLYTE; CONDUCTIVITY; PEMFC;
D O I
10.1016/j.fuel.2010.10.018
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The performance of proton exchange membrane fuel cell (PEMFC) degrades when carbon monoxide (CO) is present in the supplied fuel, which is referred to as CO poisoning. Even though the high temperature PEMFC (HT-PEMFC) with a typical operating temperature range from 100 degrees C to 200 degrees C features higher CO tolerance than the conventional PEMFC operating at lower than 100 degrees C, the performance degradation of HT-PEMFC is still significant with high CO concentrations (e. g. >= 0.5% CO by volume at 130 degrees C) in the supplied fuel. In this study, a CO poisoning model is developed for HT-PEMFCs with phosphoric acid doped polybenzimidazole (PBI) membranes. The present three-dimensional non-isothermal model compares well with published experimental data at various operating temperatures and CO concentrations in the supplied fuel. It is found that the CO adsorption/desorption processes follow Langmuir kinetics in HT-PEMFCs instead of the well-known Temkin kinetics in conventional PEMFCs. The results indicate that a HT-PEMFC can operate with sufficiently good performance at 130 degrees C or higher with hydrogen gas produced by methanol reforming with selective oxidation process, and at 160 degrees C or higher even without the selective oxidation process. At high current densities, it is also observed that severe performance degradation due to CO poisoning only occurs if the volume averaged hydrogen coverage is lower than 0.1 in the anode catalyst layer (CL). (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码:568 / 582
页数:15
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