Abstract
In the last few decades many discussions have been made on the mechanism of formic acid electro-oxidation, as there are three parallel pathways by which the process may proceed. In addition to this intricate mechanism, it was recently reported that in a solution containing formic acid and hydrazine, the latter may be electro-oxidized without interference of any of the intermediates of the former. In this paper we report evidences that a more-than-additive interaction between hydrazine and formic acid may occur and lead to a change in the oscillatory behavior of the system. Additionally, we also report the determination of average oxide coverage in both systems. The results herein presented suggest that hydrazine decreases the poisoning of the surface by the accumulation of subsurface oxygen. It was not possible to determine the exact mechanism of this interaction; however enough data is presented to assume that hydrazine and formic acid interact synergistically.