On the temperature distribution in polymer electrolyte fuel cells

Abstract This paper presents 2D thermal model of a fuel cell to elucidate some of the issues and important parameters with respect to temperature distributions in PEM fuel cells. A short review on various properties affecting the temperature profile and the heat production in the polymer electrolyte fuel cell is included. At an average current density of 1 A cm−2, it is found that the maximum temperature of the MEA is elevated by between 4.5 and 15 K compared to the polarisation plate temperature. The smallest deviation corresponds to one dimensional transport, while the largest corresponds to the two dimensional transport considering anisotropic thermal conductivity. The two dimensional thermal model further predicts increased lost work. While most of the heat generation is allocated in the cathode, it is shown that the heat effect may be balanced by the water phase change in the anode. The most significant factor in determining the temperature distribution is the gas channel geometry (width and channel type), followed by the thermal conductivity of the porous transport layer and state of the water in the cell.

[1]  Markku J. Lampinen,et al.  Analysis of Free Energy and Entropy Changes for Half‐Cell Reactions , 1993 .

[2]  Signe Kjelstrup,et al.  A highway in state space for reactors with minimum entropy production , 2005 .

[3]  Jon G. Pharoah,et al.  A comparison of different approaches to modelling the PEMFC catalyst layer , 2008 .

[4]  Jack S. Brenizer,et al.  Passive control of liquid water storage and distribution in a PEFC through flow-field design , 2008 .

[5]  D. Maillet,et al.  Heat sources in proton exchange membrane (PEM) fuel cells , 2009 .

[6]  Alexander Wokaun,et al.  In situ observation of the water distribution across a PEFC using high resolution neutron radiography , 2008 .

[7]  K. Kreuer,et al.  On the development of proton conducting materials for technological applications , 1997 .

[8]  S. Kjelstrup,et al.  Ex situ measurements of through-plane thermal conductivities in a polymer electrolyte fuel cell , 2010 .

[9]  Thermodynamics of Nafion™–vapor interactions. I. Water vapor , 2002 .

[10]  S. Kjelstrup,et al.  Through-Plane Thermal Conductivity of PEMFC Porous Transport Layers , 2010 .

[11]  Felix Bauer,et al.  Influence of Temperature and Humidity on the Mechanical Properties of Nafion® 117 Polymer Electrolyte Membrane , 2005 .

[12]  Chaitanya J. Bapat,et al.  Anisotropic Heat Conduction Effects in Proton-Exchange Membrane Fuel Cells , 2007 .

[13]  John M Prausnitz,et al.  Water-Nafion equilibria. absence of Schroeder's paradox. , 2007, The journal of physical chemistry. B.

[14]  Signe Kjelstrup,et al.  Thermal conductivities from temperature profiles in the polymer electrolyte fuel cell , 2004 .

[15]  Tero Hottinen,et al.  Inhomogeneous compression of PEMFC gas diffusion layer: Part I. Experimental , 2007 .

[16]  A. Wokaun,et al.  Measuring the Current Distribution with Sub-Millimeter Resolution in PEFCs II. Impact of Operating Parameters , 2009 .

[17]  Jon G. Pharoah,et al.  On effective transport coefficients in PEM fuel cell electrodes: Anisotropy of the porous transport layers , 2006 .

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

[19]  Srinivas Tadigadapa,et al.  Thin film temperature sensor for real-time measurement of electrolyte temperature in a polymer electrolyte fuel cell , 2006 .

[20]  Bernd Bauer,et al.  Polymeric proton conducting membranes for medium temperature fuel cells (110–160°C) , 2001 .

[21]  Jingwei Hu,et al.  Preparation and characterization of sulfated zirconia (SO42−/ZrO2)/Nafion composite membranes for PEMFC operation at high temperature/low humidity , 2006 .

[22]  D. Maillet,et al.  Estimation of the effective thermal conductivity of carbon felts used as PEMFC Gas Diffusion Layers , 2008 .