Hydrogen Sulfide Kinetics on Pem Fuel Cell Electrodes
نویسندگان
چکیده
A concise mechanism for the poisoning kinetics of hydrogen sulfide (H2S) on composite solid polymer electrolyte Pt (SPE-Pt) electrode is presented. The simplified version of the mechanism is validated experimentally by charge balances and theoretically by a model, which predicts the oxidation current as a function of the applied potential. H2S dissociatively adsorbs onto SPE-Pt electrode as linear and bridge bonded sulfur (S) species and, under favorable potentials, undergoes electro-oxidation to sulfur and then to sulfur dioxide (SO2). A fraction of the adsorbed S species remains as ‘hard-to-oxidize’ adsorbents and causes irreversible loss of catalytic activity. Deactivation of bridge sites occurs first followed by the loss of linear sites.
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