By Felix N. Büchi, Minoru Inaba, Thomas J. Schmidt

A significant a part of the competitiveness hole of polymer electrolyte gasoline phone (PEFC) know-how in automobile and desk bound co-generation purposes is due loss of sturdiness. This publication analyzes the proper degradation techniques in PEFC at the point of elements, cells and stacks, and functions. well known authors from the PEFC box describe and examine in 23 chapters the correct degradation mechanisms and mitigation strategies.

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2006) Prediction of Local Hydrogen Starvation in a PEM Fuel Cell: Origin and Materials Impact, American Chemical Society 232nd National Meeting, Div. Fuel Chem. Fuel Chemistry Preprints Vol. 52/No. 2, San Francisco, CA. A. (2007) Start/stop and local H2 starvation mechanisms of carbon corrosion: Model vs. , 11(1), 963. Heckman, F. and Harling, D. (1966) Progressive oxidation of selected particles of carbon black: Further evidence for a new microstructural model, Rubber Chem. , 39, 1. D. (2004) Characterization of vulcan electrochemiclly oxidized under simulated PEM fuel cell conditions, J.

However, during standby or inadvertent shutdown periods, they can redissolve into the membrane and accelerate membrane chemical degradation at OCV conditions, with H2 and O2 crossover. During PEMELC operation, contaminant ions such as amines are electrochemically transported to the membrane/cathode interface. They can “poison” the cathode catalyst, as well as decrease local membrane or ionomer water content, leading to enhanced peroxide/radical formation and chemical degradation. 08 A cm−2) is applied to the electrolyzer stack, there is a voltage spike that decreases with increasing operating time, depending on the degree of contamination.

T. Yu et al. Corrosion-Resistant Carbon Supports for PEMFC MEAs Comparisons of Carbon Corrosion of Various Carbon Supports The gas-phase oxidation of carbon blacks by oxygen and/or water is strongly catalyzed by the presence of catalytically active metals, such as platinum (Rewick et al. 1974, Stevens and Dahn 2005), whereby several weight percent of platinum on carbon can increase the gas-phase oxidation rate by orders of magnitude. 8 V and higher (vs. RHE) the carbon corrosion rate is within a factor of 2 between that for noncatalyzed and platinum-catalyzed carbon blacks (Roen et al.

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