Investigation of the behaviour of gold mesh electrodes in electrically controllable membrane electrode assemblies
Publication date
2023-08-06
Document type
Forschungsartikel
Organisational unit
ISSN
Project
StBZuEL
Series or journal
International Journal of Hydrogen Energy
Periodical volume
52
Periodical issue
Part A
First page
1263
Last page
1273
Peer-reviewed
✅
Part of the university bibliography
✅
DDC Class
620 Ingenieurwissenschaften
Keyword
Electric field modifier
Dynamic behaviour
Dynamic control
Cyclic voltammetry
Electrochemical impedance spectroscopy
Abstract
Hydrogen fuel cell technology is one of the key focus areas to facilitate the transition from carbon-based fuels to more sustainable solutions in the transportation and mobile power sectors. Transient voltage fluctuations due to load changes and even operation of fuel cells with DC/DC and DC/AC converters are detrimental to the lifetime and this paper proposes a method to deal with these fluctuations. Adding electric field modifier (EFM) electrodes made of gold to the membrane of a fuel cell was proposed elsewhere as a way to influence the short term flux of charge carriers through the membrane. While electrochemical impedance spectroscopy shows a limited capacitance of such electrodes, experiments using square wave excitation of the system in the kHz frequency range show a promising reaction of the cell to this treatment. More in-depth analysis of the used electrode material reveals the need to insulate future EFM electrodes in order to prevent oxidative dissolution. However, this work shows that the principle of using EFM electrodes to manipulate transient oscillations is physically sound.
Version
Published version
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