Coupling Respirometric HER and ORR Monitoring with Electrochemical Measurements

An experimental setup for respirometric real-time monitoring of the kinetics of the H2 evolution reaction and the O2 reduction reaction coupled with electrochemical control is presented. Cathodic polarization of different metal electrodes was carried out to verify the accuracy, and sensitivity of th...

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Bibliographic Details
Published inElectrochimica acta Vol. 412; p. 140152
Main Authors Strebl, M.G., Bruns, M.P., Virtanen, S.
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 20.04.2022
Elsevier BV
Subjects
Cathodic corrosion
Cathodic dissolution
Cathodic polarization
Chemical reactions
Chemical reduction
Dissolution
Electrode kinetics
Electrode polarization
HER and ORR real-time monitoring
Hydrogen evolution
Hydrogen peroxide
Liquid phases
Monitoring
Oxidation
Oxygen reduction reactions
Respirometric Method
Response time
Vapor phases
Electrode kinetics
Respirometric Method
HER and ORR real-time monitoring
Cathodic corrosion
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Summary:An experimental setup for respirometric real-time monitoring of the kinetics of the H2 evolution reaction and the O2 reduction reaction coupled with electrochemical control is presented. Cathodic polarization of different metal electrodes was carried out to verify the accuracy, and sensitivity of this approach. It was found that the respirometric response was in excellent agreement with the applied electrical signal. Dissolution of H2 in the liquid phase can lead to a delayed detection of the evolved H2 in the gas phase. However, reducing the volume of electrolyte in the setup can diminish this lag in response time. The influence of H2 oxidation on reactive Pt and the generation of H2O2 on Au on the respirometric monitoring of cathodic reactions was investigated. Finally, the combined respirometric and electrochemical approach was applied to quantify dissolution of Al during cathodic polarization by relating the total cathodic charge with the electrical signal.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2022.140152