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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.)

Active electrochemical interfaces stabilized through self-organized potential oscillations

Full text
Author(s):
Nogueira, Jessica A. [1, 2] ; Lopes, Pietro P. [2] ; Markovic, Nenad M. [2] ; Varela, Hamilton [1]
Total Authors: 4
Affiliation:
[1] Univ Sao Paulo, Sao Carlos Inst Chem, BR-13560970 Sao Carlos, SP - Brazil
[2] Argonne Natl Lab, Mat Sci Div, Lemont, IL 60439 - USA
Total Affiliations: 2
Document type: Journal article
Source: Electrochemistry Communications; v. 121, DEC 2020.
Web of Science Citations: 0
Abstract

Some electrochemical systems are known to have higher average efficiency when operated under an oscillatory regime. Given the compromise between activity and stability, the stability of electrochemical interfaces in a self-organized, oscillatory state must be taken into account. Here we evaluate the electro-oxidation of methanol and formic acid on platinum under regular and oscillatory conditions, and study the stability by following the Pt dissolution rates in situ with a stationary probe rotating disk electrode (SPRDE) coupled to an inductively coupled plasma mass spectrometer (ICP-MS). Generally speaking, as the electro-oxidation reaction proceeds, the platinum dissolution rate increases considerably. To guarantee Pt stability, the potential must be kept below 1.0 V vs. RHE. Interestingly, no dissolution is detectable when the electrode potential undergoes temporary self-organization, ensuring a stable and active interface. (AU)

FAPESP's process: 14/50279-4 - Brasil Research Centre for Gas Innovation
Grantee:Julio Romano Meneghini
Support Opportunities: Research Grants - Research Centers in Engineering Program
FAPESP's process: 17/17644-9 - Stability of electrocatalysts towards the electro-oxidation of organic molecules
Grantee:Jéssica Alves Nogueira
Support Opportunities: Scholarships abroad - Research Internship - Doctorate
FAPESP's process: 15/09295-9 - Dynamic behavior in low-temperature fuel cells based on oxidation of small organic molecules
Grantee:Jéssica Alves Nogueira
Support Opportunities: Scholarships in Brazil - Doctorate
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: 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