2024
DOI: 10.1016/j.ijhydene.2024.03.373
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Revealing the critical role of low voltage excursions in enhancing PEM fuel cell catalyst degradation by automotive hydrogen/air potential cycling experiments

Elena Colombo,
Andrea Casalegno,
Laure Guetaz
et al.
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Cited by 4 publications
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“…3) should hold for other voltage cycling ASTs (excluding bulk carbon support corrosion over 1.0 V), one only would need to know how rapidly a new voltage cycling protocol reduces the electrode roughness factor to understand the associated voltage losses (without requiring further electrochemical tests about the state-of-health of the MEA at a given cathode rf). 64 Thus, as shown in Table I, one can extract for each catalyst the maximum achievable cycle number until a specific durability criterion is met; from this, one can define a durability improvement factor with respect to the Vu based catalyst, calculated as the ratio of the maximum achievable cycles for a given catalyst vs that for the Vu based catalyst at the same criterion (CN x /CN Vu ). We have shown that for solid and (accessible) porous carbon supported catalysts, differences in the cathode rf at BoL and in the characteristic trend of the H 2 /air performance vs rf exist, and thus the rf-loss instead of the absolute rf-value at EoL is used for further comparison.…”
Section: Mea 2 −mentioning
confidence: 99%
“…3) should hold for other voltage cycling ASTs (excluding bulk carbon support corrosion over 1.0 V), one only would need to know how rapidly a new voltage cycling protocol reduces the electrode roughness factor to understand the associated voltage losses (without requiring further electrochemical tests about the state-of-health of the MEA at a given cathode rf). 64 Thus, as shown in Table I, one can extract for each catalyst the maximum achievable cycle number until a specific durability criterion is met; from this, one can define a durability improvement factor with respect to the Vu based catalyst, calculated as the ratio of the maximum achievable cycles for a given catalyst vs that for the Vu based catalyst at the same criterion (CN x /CN Vu ). We have shown that for solid and (accessible) porous carbon supported catalysts, differences in the cathode rf at BoL and in the characteristic trend of the H 2 /air performance vs rf exist, and thus the rf-loss instead of the absolute rf-value at EoL is used for further comparison.…”
Section: Mea 2 −mentioning
confidence: 99%