Ionomer content in the catalyst layer of polymer electrolyte membrane fuel cell (PEMFC): Effects on

Abstract The percolating paths of the carbons and electrolytes in a cathode catalyst layer (CCL) could be successfully visualized in three-dimensions in order to investigate both the electronic and ionic connectivity by modeling a three-dimensional (3-D), meso-scale CCL of a polymer electrolyte membrane fuel cell (PEMFC). The effective Knudsen diffusion coefficients could also be obtained by computing pore tortuosity values. Electrochemical simulation studies were carried out by feeding air at 70 °C. Low platinum (Pt) loading (0.1 mg cm−2) catalysts with ionomer contents ranging from 14 to 50% were studied. The performance of a PEMFC electrode was affected by the ionomer content which is optimal at about 33%. In this case, both electronic and ionic connectivity produced the broadest active surface area of the Pt catalyst. The polarization drop tendency was in good agreement with the experiment, and this percolation study could successfully explain the existence of an optimum amount of ionomer.

[1]  Xianguo Li,et al.  Composition and performance modelling of catalyst layer in a proton exchange membrane fuel cell , 1999 .

[2]  K. Karan,et al.  An improved two-dimensional agglomerate cathode model to study the influence of catalyst layer structural parameters , 2005 .

[3]  H. Chu,et al.  A transient model of PEM fuel cells based on a spherical thin film-agglomerate approach , 2007 .

[4]  Dai-jun Yang,et al.  Effect of metal particle size and Nafion content on performance of MEA using Ir-V/C as anode catalyst , 2010 .

[5]  Hongtan Liu,et al.  Modelling of performance of PEM fuel cells with conventional and interdigitated flow fields , 1999 .

[6]  Edson A. Ticianelli,et al.  Development and electrochemical studies of gas diffusion electrodes for polymer electrolyte fuel cells , 1996 .

[7]  M. Koyama,et al.  Development of the overpotential simulator for polymer electrolyte fuel cells and application for optimization of cathode structure , 2008 .

[8]  Yuko Aoyama,et al.  Investigation of the Microstructure in the Catalyst Layer and Effects of Both Perfluorosulfonate Ionomer and PTFE‐Loaded Carbon on the Catalyst Layer of Polymer Electrolyte Fuel Cells , 1995 .

[9]  A. Vorobev,et al.  A computational model of a PEM fuel cell with finite vapor absorption rate , 2007 .

[10]  Biao Zhou,et al.  Water and thermal management for Ballard PEM fuel cell stack , 2005 .

[11]  K. Scott,et al.  The effects of ionomer content on PEM water electrolyser membrane electrode assembly performance , 2010 .

[12]  Ned Djilali,et al.  Computational model of a PEM fuel cell with serpentine gas flow channels , 2004 .

[13]  V. Subramanian,et al.  Effect of Varying Electrolyte Conductivity on the Electrochemical Behavior of Porous Electrodes , 2005 .

[14]  E. Passalacqua,et al.  Influence of Nafion loading in the catalyst layer of gas-diffusion electrodes for PEFC , 1999 .

[15]  S. Chan,et al.  Numerical analysis of Pt utilization in PEMFC catalyst layer using random cluster model , 2006 .

[16]  Hongtan Liu,et al.  A two-phase flow and transport model for the cathode of PEM fuel cells , 2002 .

[17]  Xianguo Li,et al.  Modelling of polymer electrolyte membrane fuel cells with variable degrees of water flooding , 2000 .

[18]  K. Yin,et al.  Parametric Study of Proton-Exchange-Membrane Fuel Cell Cathode Using an Agglomerate Model , 2005 .

[19]  S. Srinivasan,et al.  Measurements of proton conductivity in the active layer of PEM fuel cell gas diffusion electrodes , 1998 .

[20]  Z. Qi,et al.  Low Pt loading high performance cathodes for PEM fuel cells , 2003 .

[21]  Michael Eikerling,et al.  Functionally graded cathode catalyst layers for polymer electrolyte fuel cells - I. Theoretical modeling , 2004 .

[22]  A. Parthasarathy,et al.  Temperature Dependence of the Electrode Kinetics of Oxygen Reduction at the Platinum/Nafion® Interface—A Microelectrode Investigation , 1992 .

[23]  T. Springer,et al.  Polymer Electrolyte Fuel Cell Model , 1991 .

[24]  Ned Djilali,et al.  A 3D, Multiphase, Multicomponent Model of the Cathode and Anode of a PEM Fuel Cell , 2003 .

[25]  G. Squadrito,et al.  Nafion content in the catalyst layer of polymer electrolyte fuel cells: effects on structure and performance , 2001 .

[26]  Sandip Mazumder,et al.  Rigorous 3-D mathematical modeling of PEM fuel cells. II. Model predictions with liquid water transport , 2003 .

[27]  Datong Song,et al.  Numerical optimization study of the catalyst layer of PEM fuel cell cathode , 2004 .

[28]  J. Newman,et al.  Mass Transport in Gas‐Diffusion Electrodes: A Diagnostic Tool for Fuel‐Cell Cathodes , 1998 .

[29]  Partha P. Mukherjee,et al.  Direct numerical simulation (DNS) modeling of PEFC electrodes: Part I. Regular microstructure , 2006 .

[30]  T. Lim,et al.  The effects of Nafion® ionomer content in PEMFC MEAs prepared by a catalyst-coated membrane (CCM) spraying method , 2010 .

[31]  J. Newman,et al.  Modeling Two-Phase Behavior in PEFCs , 2004 .