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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.)

urface and Volumetric Phenomena on Polyaniline-Supported Electrocatalyst

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Author(s):
Ferreira, Graziela C. A. [1] ; Khalid, Mohmmad [1] ; Napporn, Teko W. [2] ; Torresi, Roberto M. [3] ; Varela, Hamilton [1]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Sao Carlos Inst Chem, BR-13560970 Sao Carlos, SP - Brazil
[2] Univ Poitiers, IC2MP UMR CNRS 7285, F-86073 Poitiers - France
[3] Univ Sao Paulo, Inst Quim, Dept Quim Fundamental, BR-05508000 Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Journal of Physical Chemistry C; v. 125, n. 47, p. 26073-26083, DEC 2 2021.
Web of Science Citations: 0
Abstract

Conducting polymers have been used as support for catalysts toward distinct electrocatalytic reactions. The overall activity of the modified interfaces critically depends on both the processes on the catalyst surface and on the charge compensation within the polymer matrix. Therefore, understanding the coupling between surface and volumetric processes in such systems is of utmost importance. In this contribution, we report on the experimental investigation of the interplay between surface and volumetric processes during the electro-oxidation of formic acid (and also formaldehyde) on platinum-modified polyaniline electrodes. The study was performed through in situ nanogravimetry with the electrochemical quartz crystal nanobalance (EQCN). We have explored the dynamics of charge and mass changes along several experimental conditions, including the self-organized potential oscillations. The systematic study included the analysis of several configurations: gold electrodes covered with a PANI film and dispersed platinum (Au/PANI/Pt), platinum electrodes covered with PANI (Pt/PANI), and bare platinum electrodes. The methodology introduced includes the detailed analysis of the charge compensation process and time derivative of the mass variations. Typical results for the electro-oxidation of formic acid on PANI-supported platinum indicate that the electrocatalysis itself is reflected in the current profile, whereas the charge compensation rules the gravimetric response. This general observation also holds for the oscillatory electro-oxidation of formic acid. The physicochemical description of the support/catalyst systems described here opens interesting perspectives for the investigation of parent systems. (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
FAPESP's process: 15/26308-7 - Optimization of the physicochemical properties of nano -structured materials for applications in molecular recognition, catalysis and energy conversion/storage
Grantee:Roberto Manuel Torresi
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 19/22183-6 - Electrocatalysis VI: fundamental and applied aspects of emerging and classical problems in electrochemical energy conversion
Grantee:Edson Antonio Ticianelli
Support Opportunities: Research Projects - Thematic Grants