Abstract
Recent progress in studies on the direct formic acid fuel cell reported here includes improvements to the anode catalyst and analysis of the impact of pH on reaction rate. We demonstrate that several adatoms can be underpotentially deposited to the surface of the palladium anode catalyst to improve the oxidation of formic acid. Antimony and lead adatoms show strong improvement to operation of the fuel cell. We also demonstrate that the solution pH has a strong effect on the reaction rate in a nearly irreversible reaction (formic acid oxidation). We eliminate the effects of adsorbed surface species and conclude that the change in pH results in a change in thermodynamic driving force that is evidenced by a remarkable increase in reaction rate with increase in pH.
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