Phase diagrams and dynamical evolution of the triple-pathway electro-oxidation 
of formic acid on platinum

Freire, Joana G.; Calderon-Cardenas, Alfredo; Varela, Hamilton; Gallas, Jason A. C.

doi:10.1039/c9cp04324a

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Phase diagrams and dynamical evolution of the triple-pathway electro-oxidation of formic acid on platinum

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Varela, Hamilton
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Gallas, Jason A. C.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Citation

Freire, J. G., Calderon-Cardenas, A., Varela, H., & Gallas, J. A. C. (2020). Phase diagrams and dynamical evolution of the triple-pathway electro-oxidation of formic acid on platinum. Physical Chemistry Chemical Physics, 22(3), 1078-1091. doi:10.1039/c9cp04324a.

Cite as: https://hdl.handle.net/21.11116/0000-0005-C73D-7

Abstract

Recently, an electro-kinetic model based on a specified reaction scheme
for the electro-oxidation of formic acid on platinum was reported. The
model evaluated three reaction pathways towards the production of CO2:
the dehydrogenation and the dehydration of formic acid, and the third
and most active pathway includes fast oxidation of the formate ion.
Numerical integrations showed that the model is well-suited to describe
the experimental results in voltammetric and oscillatory regimes. In the
present paper, we provide detailed stability phase diagrams
characterizing the dynamical evolution of this system under
galvanostatic and potentiostatic regimes. We find the triple-pathway
electro-oxidation of formic acid on platinum to have rather intertwined
stability phases and, surprisingly, a total absence of chaotic
oscillations. To the best of our knowledge, this is the first study in
this direction using a realistic electrochemical model.