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Journal Article

Complex Electrooxidation of Formic Acid on Palladium

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Mota Lima,  Andressa Bastos
Instituto de Química de São Carlos, Universidade de São Paulo;
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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Eiswirth,  Markus
Physical Chemistry, Fritz Haber Institute, Max Planck Society;

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v25n7a09.pdf
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Citation

Mota Lima, A. B., Gonzalez, E. R., & Eiswirth, M. (2014). Complex Electrooxidation of Formic Acid on Palladium. Journal of the Brazilian Chemical Society, 25(7), 1208-1217. doi:10.5935/0103-5053.20140098.


Cite as: http://hdl.handle.net/11858/00-001M-0000-001A-273A-5
Abstract
Herein, oscillatory formic acid (FA) electrooxidation on polycrystalline palladium is investigated and compared with the one on polycrystalline platinum; major differences between both are attributed to differences on the kinetics of sub-set chemical network as well as to preferential routes admitted on palladium surface. To presume the kinetic rate of poison accumulation on palladium, FA oxidation was accomplished in presence of occluded hydrogen and hydrogen-free electrodes. The preferential routes were presumed from the temporal pattern. Markedly, oscillations during FA electrooxidation have minimum potential at 0.2 V, which is linked to the fast rate of direct dehydrogenation; moreover, it has one of the largest induction period (ca. 60 min) and oscillatory period (20 min) observed in electrochemistry, since subsurface hydrogen slows down the rate of CO accumulation on the surface.