The oscillatory electro-oxidation of formic acid

insights on the adsorbates involved from time-resolved ATR-SEIRAS and UV reflectance experiments

Fabian W. Hartl, Hamilton Varela, Angel Cuesta (Corresponding Author)

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Galvanostatic potential oscillations during the oxidation of formic acid were studied by time-resolved Surface-Enhanced Infrared Absorption Spectroscopy in the attenuated total reflection configuration (ATR-SEIRAS) and reflectance measurements in the ultraviolet (UV) region. ATR-SEIRAS allowed monitoring oscillations in the coverage of adsorbed CO (COad) and adsorbed bridge-bonded formate (HCOObi), while UV reflectance revealed oscillations in the coverage by specifically adsorbed anions (namely, adsorbed sulfate). The potential oscillations and the coverage of all these species are strongly interconnected, and an analysis of their correlation provides detailed insight into the autocatalytic loop responsible for the emergence of non-linear dynamics.
Original languageEnglish
Pages (from-to)249-254
Number of pages6
JournalJournal of Electroanalytical Chemistry
Volume840
Early online date4 Apr 2019
DOIs
Publication statusPublished - 1 May 2019

Fingerprint

formic acid
Electrooxidation
Formic acid
Adsorbates
Reflectometers
Infrared absorption
Carbon Monoxide
Absorption spectroscopy
Sulfates
Anions
Infrared spectroscopy
Negative ions
Experiments
Oxidation
Monitoring

Keywords

  • formic acid oxidation
  • platinum
  • potential oscillations
  • pH effect
  • ATR-SEIRAS
  • differential reflectance spectroscopy

Cite this

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title = "The oscillatory electro-oxidation of formic acid: insights on the adsorbates involved from time-resolved ATR-SEIRAS and UV reflectance experiments",
abstract = "Galvanostatic potential oscillations during the oxidation of formic acid were studied by time-resolved Surface-Enhanced Infrared Absorption Spectroscopy in the attenuated total reflection configuration (ATR-SEIRAS) and reflectance measurements in the ultraviolet (UV) region. ATR-SEIRAS allowed monitoring oscillations in the coverage of adsorbed CO (COad) and adsorbed bridge-bonded formate (HCOObi), while UV reflectance revealed oscillations in the coverage by specifically adsorbed anions (namely, adsorbed sulfate). The potential oscillations and the coverage of all these species are strongly interconnected, and an analysis of their correlation provides detailed insight into the autocatalytic loop responsible for the emergence of non-linear dynamics.",
keywords = "formic acid oxidation, platinum, potential oscillations, pH effect, ATR-SEIRAS, differential reflectance spectroscopy",
author = "Hartl, {Fabian W.} and Hamilton Varela and Angel Cuesta",
note = "The support of the University of Aberdeen is gratefully acknowledged. F.W.H. and H.V. acknowledge S{\~a}o Paulo Research Foundation (FAPESP) for the scholarship (grant #2014/08030-9, grant #2017/07286-8) and financial support (grant #2013/16930-7). HV (grant #306151/2010-3) acknowledges Conselho Nacional de Desenvolvimento Cient{\'i}fico e Tecnol{\'o}gico (CNPq) for financial support. This study was also supported by the Coordena{\cc}{\~a}o de Aperfei{\cc}oamento de Pessoal de N{\'i}vel Superior - Brasil (CAPES) - Finance Code 001.",
year = "2019",
month = "5",
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language = "English",
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journal = "Journal of Electroanalytical Chemistry",
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TY - JOUR

T1 - The oscillatory electro-oxidation of formic acid

T2 - insights on the adsorbates involved from time-resolved ATR-SEIRAS and UV reflectance experiments

AU - Hartl, Fabian W.

AU - Varela, Hamilton

AU - Cuesta, Angel

N1 - The support of the University of Aberdeen is gratefully acknowledged. F.W.H. and H.V. acknowledge São Paulo Research Foundation (FAPESP) for the scholarship (grant #2014/08030-9, grant #2017/07286-8) and financial support (grant #2013/16930-7). HV (grant #306151/2010-3) acknowledges Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for financial support. This study was also supported by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001.

PY - 2019/5/1

Y1 - 2019/5/1

N2 - Galvanostatic potential oscillations during the oxidation of formic acid were studied by time-resolved Surface-Enhanced Infrared Absorption Spectroscopy in the attenuated total reflection configuration (ATR-SEIRAS) and reflectance measurements in the ultraviolet (UV) region. ATR-SEIRAS allowed monitoring oscillations in the coverage of adsorbed CO (COad) and adsorbed bridge-bonded formate (HCOObi), while UV reflectance revealed oscillations in the coverage by specifically adsorbed anions (namely, adsorbed sulfate). The potential oscillations and the coverage of all these species are strongly interconnected, and an analysis of their correlation provides detailed insight into the autocatalytic loop responsible for the emergence of non-linear dynamics.

AB - Galvanostatic potential oscillations during the oxidation of formic acid were studied by time-resolved Surface-Enhanced Infrared Absorption Spectroscopy in the attenuated total reflection configuration (ATR-SEIRAS) and reflectance measurements in the ultraviolet (UV) region. ATR-SEIRAS allowed monitoring oscillations in the coverage of adsorbed CO (COad) and adsorbed bridge-bonded formate (HCOObi), while UV reflectance revealed oscillations in the coverage by specifically adsorbed anions (namely, adsorbed sulfate). The potential oscillations and the coverage of all these species are strongly interconnected, and an analysis of their correlation provides detailed insight into the autocatalytic loop responsible for the emergence of non-linear dynamics.

KW - formic acid oxidation

KW - platinum

KW - potential oscillations

KW - pH effect

KW - ATR-SEIRAS

KW - differential reflectance spectroscopy

U2 - 10.1016/j.jelechem.2019.04.015

DO - 10.1016/j.jelechem.2019.04.015

M3 - Article

VL - 840

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JO - Journal of Electroanalytical Chemistry

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