Start/Stop and Local H2 Starvation Mechanisms of Carbon Corrosion: Model vs. Experiment

Autor:	Wenbin Gu, Paul Taichiang Yu, Hubert A. Gasteiger, Robert N. Carter
Rok vydání:	2007
Předmět:	Materials science business.industry Capacitive sensing Limiting current Proton exchange membrane fuel cell Starvation (glaciology) Mechanics Structural engineering Cathode Carbon corrosion law.invention Corrosion law Electrode business
Zdroj:	ECS Transactions. 11:963-973
ISSN:	1938-6737 1938-5862
DOI:	10.1149/1.2781008
Popis:	This paper discusses fundamental models developed to predict cathode carbon support corrosion induced by start-stop and local H2 starvation in a PEM (proton exchange membrane) fuel cell. The model incorporating the electrode pseudo-capacitance agrees well with controlled start/stop experiments. When the pseudo-capacitive effect is included, the model not only captures the difference in CO2 evolution between start and stop, but also matches the measured spatially resolved mass activity and limiting current distribution of the damaged cathode electrode. For long H2/air-front residence times during start/stop, commonly used in accelerated materials tests, the electrode damage predicted by the capacitive model is similar to that predicted by previously published models that neglect pseudo-capacitive effects. However, for application relevant shorter residence times, significantly lower damages are predicted when capacitive effects are included, consistent with experiments. Because local H2 starvation occurs on a longer time scale, pseudo-capacitive effects are less significant.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::aa2fb4bda7b65c8d16ea7e9cb6f63674 https://doi.org/10.1149/1.2781008 Zobrazit plný text záznamu