Abstract
A study has been made of the effect of an irreversibly adsorbed iodide layer on the anodic oxidation of formic acid at a platinized platinum electrode. It is shown that, in the presence of the preadsorbed iodide layer, the oxidation process obeys the following rate expression, i=nF k→ cα g(θI) exp(αanFφr/RT where α≈0.75 and αan≈0.5. This is explained in terms of the following rate-determining step, (HCOOH)ads→C*OOH+H++e and involves the adsorption of formic acid on the iodide covered surface. A strong catalytic effect of the iodide layer is observed; the function g (θI) passes through two maxima at θI values of 0.15 and 0.53. It is suggested that these effects arise from a coverage-dependent variation of bond strength between the adsorbed iodide and platinum.
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