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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Thorough Analysis of the Effect of Temperature on the Electro-Oxidation of Formic Acid

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Author(s):
Calderon-Cardenas, Alfredo [1, 2] ; Paredes-Salazar, Enrique A. [1] ; Mujica-Martinez, Cesar A. [2] ; Nagao, Raphael [3, 4] ; Varela, Hamilton [1, 5]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Narino, GIFBA, San Juan De Pasto 520002, Narino - Colombia
[3] Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas, SP - Brazil
[4] Univ Estadual Campinas, Ctr Innovat New Energies, BR-13083970 Campinas, SP - Brazil
[5] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden - Germany
Total Affiliations: 5
Document type: Journal article
Source: Journal of Physical Chemistry C; v. 124, n. 44, SI, p. 24259-24270, NOV 5 2020.
Web of Science Citations: 0
Abstract

In this work, the effect of temperature on the electro-oxidation of formic acid on platinum was modeled and numerically investigated. Numerical simulations were carried out using an electrokinetic model recently validated through voltammetric and galvanostatic experiments. We show that the intrinsic electrocatalytic activity of the working electrode for the overall electrochemical reaction can hardly be interpreted from the apparent activation energy due to the complexity of the reaction scheme. A detailed analysis is possible through the estimation of the activation energies determined from the individual rate coefficients. By doing so, we observed that the direct pathway, with an activation energy of 91 kJ mol(-1) at 0.40 V and 72 kJ mol(-1) at 0.80 V, is the energetically easiest pathway for the formation of CO2 in the proposed reaction scheme. Regarding the self-organized potential oscillations under the galvanostatic regime, our model was able to reproduce experimentally observed results including the phenomena of temperature compensation and overcompensation. Importantly, we have introduced a formalism to classify the elementary steps that contribute to the increase and decrease of the oscillatory frequency in electrochemical systems. Our results shed light on the understanding of the temperature dependence of complex electrocatalytic reactions, and the developed methodology was proven to be robust and of general applicability. (AU)

FAPESP's process: 13/16930-7 - Electrocatalysis V: electrocatalytic processes of chemical and electrical energy interconversion
Grantee:Edson Antonio Ticianelli
Support type: Research Projects - Thematic Grants
FAPESP's process: 16/01817-9 - Design and control of self-organized electrochemical patterns
Grantee:Raphael Nagao de Sousa
Support type: Research Grants - Young Investigators Grants
FAPESP's process: 17/11986-5 - Research Division 1 - dense energy carriers
Grantee:Ana Flávia Nogueira
Support type: Research Grants - Research Centers in Engineering Program