Study of the Exchange Current Density for the Hydrogen Oxidation and Evolution Reactions
2007; Institute of Physics; Volume: 154; Issue: 7 Linguagem: Inglês
10.1149/1.2733987
ISSN1945-7111
AutoresK.C. Neyerlin, Wenbin Gu, Jacob Jorné, Hubert A. Gasteiger,
Tópico(s)Advanced battery technologies research
ResumoThe exchange current density for the hydrogen oxidation/evolution reactions was determined in a proton exchange membrane fuel cell. Ultralow Pt-loaded electrodes were used to obtain measurable kinetic overpotential signals ( at ). Using a simple Butler–Volmer equation, the exchange current density and transfer coefficient were determined to lie within the range of and 0.5–1, respectively. Due to the fast kinetics, no measurable voltage losses are predicted for pure- proton exchange membrane fuel cell applications when lowering the anode Pt loadings from its current value of to the automotive target of .
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