Electrooxidation of Reformate Gases at Model Anodes
2011
This paper summarizes the experimental and modeling results
concerning the electrooxidation of hydrogen and carbon monoxide,
the main oxidizable compounds in reformates, at patterned nickel
anodes on polycrystalline yttria stabilized zirconia electrolytes.
The line specific resistance of the three phase boundary was
evaluated within a wide range of gas compositions and temperature.
The investigations showed that microstructural stability, impurities,
accelerated degradation and reversible dynamic changes are key
issues which have to be considered. Elementary kinetic models,
parameterized with literature data, temperature-programmed
desorption and reaction and quantum chemical calculation results
were in excellent agreement with the experimental data. For the
first time it could be shown that the line specific resistance values
evaluated by means of patterned anodes are applicable in
homogenized and space resolved models for cermet anodes.
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