Abstract
Carbon-support corrosion causes electrode structure damage and thus electrode degradation. This chapter discusses fundamental models developed to predict cathode carbon-support corrosion induced by local H2 starvation and start–stop in a proton-exchange-membrane (PEM) fuel cell. Kinetic models based on the balance of current among the various electrode reactions are illustrative, yielding much insight on the origin of carbon corrosion and its implications for future materials developments. They are particularly useful in assessing carbon corrosion rates at a quasi-steady-state when an H2-rich region serves as a power source that drives an H2-free region as a load. Coupled kinetic and transport models are essential in predicting when local H2 starvation occurs and how it affects the carbon corrosion rate. They are specifically needed to estimate length scales at which H2 will be depleted and time scales that are valuable for developing mitigation strategies. To predict carbon-support loss distributions over an entire active area, incorporating the electrode pseudo-capacitance appears necessary for situations with shorter residence times such as start–stop events. As carbon-support corrosion is observed under normal transient operations, further model improvement shall be focused on finding the carbon corrosion kinetics associated with voltage cycling and incorporating mechanisms that can quantify voltage decay with carbon-support loss.
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Acknowledgements
The authors thank Dr. Frederick T. Wagner for useful discussions.
List of Symbols
a | electrochemically active surface area of an ingredient in an electrode, cm 2 /mg |
C φ | electrode pseudo-capacitance, F/cm 2 electrode |
ci | molar concentration of species i, mol/cm 3 |
Di | effective diffusion coefficient of species i, cm 2 /s |
Di,mix | molecular diffusion coefficient of species i in a multi-component mixture, cm 2 /s |
DK,i | Knudsen diffusion coefficient of species i, cm 2 /s |
d | pore diameter of an electrode, cm |
Eo | standard equilibrium (or reversible) potential of an electrode reaction, V |
Edry or wet | activation energy for gas transport in the dry (or wet) phase of membrane, J/mol |
Erev | activation energy of an electrode reaction at zero overpotential, J/mol |
E an or cath | electric potential of anode (or cathode) electrode, V |
F | Faraday constant, C/equiv |
i | current density, A/cm 2 |
io | exchange current density of an electrode reaction, A/cm 2 Pt or C |
ix,O2 | O 2 crossover current density, A/cm 2 |
Kg | permeability of a porous medium, cm 2 /s |
Km | permeability of gaseous species through membrane, mol cm/(cm 2 s kPa) |
L | loading of an ingredient in an electrode, mg/cm 2 |
M | molecular weight of a species, g/mol |
m | index for carbon weight loss dependence in the COR kinetics equation |
n | number of electrons transferred in an electrode reaction |
p | pressure, partial pressure of a species, kPa |
q max | maximum stored charge, C/cm 2 electrode |
R | universal gas constant, J/mol/K |
R H | proton transport resistance, Ω cm 2 |
r Pt/C | weight ratio of ingredient Pt to carbon support in an electrode |
RH | relative humidity, % |
s | stoichiometry of a species in an electrode reaction |
T | temperature, °C or K |
t | time, s |
v | gas velocity, cm/s |
x | normalized location of H 2 /O 2 front at the anode |
xi | mole fraction of species i in a gas mixture |
Greek Symbols | |
α a | anodic transfer coefficient of an electrode reaction |
α c | cathodic transfer coefficient of an electrode reaction |
δ | thickness, cm |
ɛ | porosity |
φ | electric potential, V |
γ | reaction order of a species in an electrode reaction |
η | charge transfer overpotential of an electrode reaction, V |
κ | proton conductivity, S/cm |
σ τ | electron conductivity, S/cm tortuosity |
μ mix | viscosity of a gas mixture, Pa s |
θ | Mass fraction of carbon support that has been lost |
Subscripts | |
an | anode |
cath | cathode |
CL | catalyst layer |
e | electrolyte conducting protons |
mem | membrane |
s | solid conducting electrons |
Superscripts | |
ref | reference |
sat | saturated |
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Gu, W., Yu, P.T., Carter, R.N., Makharia, R., Gasteiger, H.A. (2009). Modeling of Membrane-Electrode-Assembly Degradation in Proton-Exchange-Membrane Fuel Cells – Local H2 Starvation and Start–Stop Induced Carbon-Support Corrosion. In: Wang, CY., Pasaogullari, U. (eds) Modeling and Diagnostics of Polymer Electrolyte Fuel Cells. Modern Aspects of Electrochemistry. Springer, New York, NY. https://doi.org/10.1007/978-0-387-98068-3_2
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