Nonlinear analysis of current instabilities in high temperature fuel cells

The conductivity of electrolytes in high temperature fuel cells increases with increasing temperature. It is shown that this property may lead to instabilities, inhomogeneous temperature fields, and hot spots. A simple spatially one-dimensional model of a cell is studied by phase plane analysis and numerical bifurcation analysis. The operation of the cell at constant voltage and at constant current is considered. It is found that in both cases spatial temperature patterns and channels of high current density can form.

[1]  F. Niedernostheide,et al.  MECHANISMS OF SPATIAL CURRENT-DENSITY INSTABILITIES IN P+-P--N-P+-N++ STRUCTURES , 1999, patt-sol/9903005.

[2]  B. Steele,et al.  Materials for fuel-cell technologies , 2001, Nature.

[3]  Peter Heidebrecht,et al.  Dynamic Modeling and Simulation of a Countercurrent Molten Carbonate Fuel Cell (MCFC) with Internal Reforming , 2002 .

[4]  Hee Chun Lim,et al.  Analysis of temperature and pressure fields in molten carbonate fuel cell stacks , 2001 .

[5]  Gustav Kortüm,et al.  Lehrbuch der Elektrochemie , 1948 .

[6]  Ravindra Datta,et al.  Sustained Potential Oscillations in Proton Exchange Membrane Fuel Cells with PtRu as Anode Catalyst , 2002 .

[7]  M. Golubitsky,et al.  Singularities and groups in bifurcation theory , 1985 .

[8]  E. Wagner.  International Series of Numerical Mathematics , 1963 .

[9]  K. Sundmacher,et al.  Feasibility of an Electrochemical Membrane Reactor for the Partial Oxidation of n-Butane to Maleic Anhydride , 2004 .

[10]  John B. Goodenough,et al.  Superior Perovskite Oxide‐Ion Conductor; Strontium‐ and Magnesium‐Doped LaGaO3: I, Phase Relationships and Electrical Properties , 2005 .

[11]  Eckehard Schöll,et al.  Global bifurcation and hysteresis of self-generated oscillations in a microscopic model of nonlinear transport in p-Ge , 1989 .

[12]  Sonia Tulyani,et al.  Steady-state multiplicity in the autohumidification polymer electrolyte membrane fuel cell , 2003 .

[13]  H. Willebrand,et al.  Observation of solitary filaments and spatially periodic patterns in a dc gas-discharge system , 1990 .