Proton Transfer and Other ECIT Processes

When filled with Hupd, the lines of atoms at the furrow tops of Pt(110)(lx2) are still unoccupied.186 Even so, the weak structure shows a lattice expansion of 10% compared with 2% for the other low-index surfaces.18 Unlike Pt(100), adjacent sites are available for Tafel 

High coverages imply small experimental Arrhenius preexponential terms, which were (110) 0.043 A-cnf2 (100) 0.070 

Bowden s early work, dating before careful elimination of adsorbable impurities, reported an activation energy of 29-38 kJ/mole15 on polyctystalline platinum, the higher value being on old electrode surfaces. This suggests a preexponential value of about 0.5 A/cm2. 

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