Journal article
Dynamic Interfacial Reaction Rates from Electrochemistry-Mass Spectrometry
Department of Physics, Technical University of Denmark1
Surface Physics and Catalysis, Department of Physics, Technical University of Denmark2
Imperial College London3
VISION – Center for Visualizing Catalytic Processes, Centers, Technical University of Denmark4
National Centre for Nano Fabrication and Characterization, Technical University of Denmark5
Electrochemistry-mass spectrometry is a versatile and reliable tool to study the interfacial reaction rates of Faradaic processes with high temporal resolutions. However, the measured mass spectrometric signals typically do not directly correspond to the partial current density toward the analyte due to mass transport effects.
Here, we introduce a mathematical framework, grounded on a mass transport model, to obtain a quantitative and truly dynamic partial current density from a measured mass spectrometer signal by means of deconvolution. Furthermore, it is shown that the time resolution of electrochemistry-mass spectrometry is limited by entropy-driven processes during mass transport to the mass spectrometer.
The methodology is validated by comparing the measured impulse responses of hydrogen and oxygen evolution to the model predictions and subsequently applied to uncover dynamic phenomena during hydrogen and oxygen evolution in an acidic electrolyte.
Language: | English |
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Publisher: | American Chemical Society |
Year: | 2021 |
Pages: | 7022-7028 |
ISSN: | 15206882 and 00032700 |
Types: | Journal article |
DOI: | 10.1021/acs.analchem.1c00110 |
ORCIDs: | Krempl, Kevin , Hochfilzer, Degenhart , Kibsgaard, Jakob , Vesborg, Peter C.K. , Hansen, Ole , Chorkendorff, Ib and 0000-0002-1815-0141 |