In situ diagnostic techniques for characterisation of polymer electrolyte membrane water electrolysers – Flow visualisation and electrochemical impedance spectroscopy

An optically transparent polymer electrolyte membrane (PEM) water electrolysis cell was studied using a high-speed camera, thermal imaging and electrochemical impedance spectroscopy to examine the relationship between flow and electrochemical performance. The flow regime spans bubble and slug flow,...

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Bibliographic Details
Published in:International journal of hydrogen energy 2014-03, Vol.39 (9), p.4468-4482
Main Authors: Dedigama, I., Angeli, P., Ayers, K., Robinson, J.B., Shearing, P.R., Tsaoulidis, D., Brett, D.J.L.
Format: Article
Language:English
Subjects:
Alternative fuels. Production and utilization
Applied sciences
Bubble formation
Diagnostic systems
Electrochemical impedance spectroscopy
Electrolytes
Energy
Exact sciences and technology
Fuels
High speed
Hydrogen
Hydrogen-based energy
Membranes
PEM electrolyser
Printed circuit board
Slug flow
Thermal imaging
Two-phase flow
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Description
Summary:An optically transparent polymer electrolyte membrane (PEM) water electrolysis cell was studied using a high-speed camera, thermal imaging and electrochemical impedance spectroscopy to examine the relationship between flow and electrochemical performance. The flow regime spans bubble and slug flow, depending on the rate of gas formation (current density) and water feed rate. Electrochemical impedance spectroscopy (EIS) shows that there is a reduction in mass transport limitation associated with the transition to slug flow. [Display omitted] •Optically transparent electrolyser cell made using printed circuit boards.•Different flow regimes identified as function of current and water feed rate.•Bubble-induced mass limitation identified in electrochemical impedance response.•Criteria for flow optimisation presented.
ISSN:0360-3199
1879-3487
DOI:10.1016/j.ijhydene.2014.01.026