Abstract
Electrochemical oxidation of sodium formate is carried out on gold—palladium alloys. A maximum of electroactivity appears for a superficial composition of about 50 at %. This synergetic effect corresponds to exchange current densities about ten times greater than those obtained on pure palladium (the most active of both metals.) The stability of the electrodes towards the solution is pH dependent: a superficial enrichment in gold is observed in acid medium, whereas an enrichment in palladium appears in neutral medium. It is therefore necessary to estimate the superficial composition in situ, eg using composition dependent characteristics of the voltammograms recorded either in supporting electrolyte alone or containing the formate salt.
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