Modeling of H2O2 formation in PEMFCs

被引：57

作者：

Chen, Cheng ^{[1
]}

Fuller, Thomas F. ^{[1
,2
]}

机构：

[1] Georgia Inst Technol, Sch Chem & Biomol Engn, Atlanta, GA 30332 USA

[2] Georgia Inst Technol, Ctr Innovat Fuel Cell & Battery Technol, Atlanta, GA 30332 USA

来源：

ELECTROCHIMICA ACTA | 2009年 / 54卷 / 16期

关键词：

PEMFC; Oxygen permeation; H2O2; formation; Agglomerate model; Membrane degradation; PROTON-EXCHANGE-MEMBRANE; ELECTROLYTE FUEL-CELLS; CATHODE CATALYST LAYER; POLYMER-ELECTROLYTE; HYDROGEN-PEROXIDE; DEGRADATION MECHANISM; OXYGEN REDUCTION; NAFION; TEMPERATURE; DURABILITY;

D O I：

10.1016/j.electacta.2009.02.021

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

070208 [无线电物理];

摘要：

A model for H2O2 formation, transport, and reaction in PEMFCs is established for the first time. Profiles of oxygen and H2O2 concentration inside the fuel cell are simulated using the agglomerate model for the electrode. The predicted concentration of H2O2 shows the same trend as experimental data under different conditions, but the level was only of the same magnitude. Low humidity, high temperature, and high oxygen/hydrogen partial pressures were found to increase the concentration of H2O2. An increase in membrane thickness or metal ion contaminant level reduces the concentration of H2O2 in the membrane. Lowering the oxygen permeability in the ionomer is the most important and effective method to reduce the formation of H2O2. The simulation results also show little change in H2O2 concentration while operating the fuel cell above 0.6V. Anodes designed with considerable thickness, high catalyst loadings and active areas can also help to suppress H2O2 formation. Finally, recommendations are made to mitigate the effects of H2O2 and prolong membrane lifetimes. (C) 2009 Elsevier Ltd. All rights reserved

引用

页码：3984 / 3995

页数：12

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