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

Author(s)

Freire, Joana G. ^[1] ; Calderon-Cardenas, Alfredo ^{[2, 3]} ; Varela, Hamilton ^{[2, 4, 5]} ; Gallas, Jason A. C. ^{[4, 5, 6]}

Affiliation

^[1] Univ Lisbon, IDL, Fac Ciencias, P-1749016 Lisbon - Portugal

^[2] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[3] Univ Narino, GIFBA, San Juan De Pasto 1175, Narino - Colombia

^[4] Max Planck Inst Phys Komplexer Syst, Nothnitzer Str 38, D-01187 Dresden - Germany

^[5] Inst Altos Estudos Paraiba, Rua Silvino Lopes 419-2502, BR-58039190 Joao Pessoa, Paraiba - Brazil

^[6] Complex Sci Ctr, 9225 Collins Ave Suite 1208, Surfside, FL 33154 - USA

• Document type: Journal article
• Source: Physical Chemistry Chemical Physics; v. 22, n. 3, p. 1078-1091, JAN 21 2020.
• Web of Science Citations: 0

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. (AU)

• FAPESP's process: 13/16930-7 - Electrocatalysis V: electrocatalytic processes of chemical and electrical energy interconversion
• Grantee: Edson Antonio Ticianelli
• Support Opportunities: Research Projects - Thematic Grants