The Impact of Impurities on Long-Term PEMFC Performance

Electrochemical experimentation and modeling indicates that impurities degrade fuel cell performance by a variety of mechanisms. Electrokinetics may be inhibited by catalytic site poisoning from sulfur compounds and CO and by decreased local proton activity and mobility caused by the presence of for...

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Main Authors: Garzon, Fernando, Lopes, Thiago, Rockward, Tommy, Sansiñena, Jose-Maria, Kienitz, Brian, Mukundan, Rangachary
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creator Garzon, Fernando
Lopes, Thiago
Rockward, Tommy
Sansiñena, Jose-Maria
Kienitz, Brian
Mukundan, Rangachary
description Electrochemical experimentation and modeling indicates that impurities degrade fuel cell performance by a variety of mechanisms. Electrokinetics may be inhibited by catalytic site poisoning from sulfur compounds and CO and by decreased local proton activity and mobility caused by the presence of foreign salt cations or ammonia. Cation impurity profiles vary with current density, valence and may change local conductivity and water concentrations in the ionomer. Nitrogen oxides and ammonia species may be electrochemically active under fuel cell operating conditions. The primary impurity removal mechanisms are electrooxidation and water fluxes through the fuel cell.
doi_str_mv 10.1149/1.3210713
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title The Impact of Impurities on Long-Term PEMFC Performance
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