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Detecting and modeling oxygen bubble evolution and detachment in proton exchange membrane water electrolyzers

Garcia-Navarro, Julio Cesar and Schulze, Mathias and Friedrich, Kaspar Andreas (2019) Detecting and modeling oxygen bubble evolution and detachment in proton exchange membrane water electrolyzers. International Journal of Hydrogen Energy, 44, pp. 27190-27203. Elsevier. DOI: 10.1016/j.ijhydene.2019.08.253 ISSN 0360-3199

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Abstract

In this work, we discuss the effect of multiphase flow dynamics on the performance of a PEM electrolyzer. We obtained images of a flow system consisting 1 of O2 and water at two stages of gas production: gas evolution via bubbles and gas exiting through the channels of a flow field. We processed the obtained images of bubble evolution with a MATLAB-based bubble detection and counting algorithm, and we found that the bubble detachment sizes remained invariant within a water flow range between 0.07 and 4.65 l h-1. We measured an average bubble detachment radius of 22.47 µm. We applied a bubble force balance developed by van Helden et al. to model the observed effect of water flow on bubble evolution, and we found that the bubble detachment radius is a weak function of water flow when the water flow is below 60 l h-1. We found that the variables that affect the bubble detachment radius the strongest were the electrode’s hydrophobicity and pore size.

Item URL in elib:https://elib.dlr.de/133205/
Document Type:Article
Title:Detecting and modeling oxygen bubble evolution and detachment in proton exchange membrane water electrolyzers
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Garcia-Navarro, Julio Cesarjulio.garcianavarro (at) dlr.deUNSPECIFIED
Schulze, MathiasMathias.Schulze (at) dlr.deUNSPECIFIED
Friedrich, Kaspar AndreasAndreas.Friedrich (at) dlr.dehttps://orcid.org/0000-0002-2968-5029
Date:2019
Journal or Publication Title:International Journal of Hydrogen Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:44
DOI :10.1016/j.ijhydene.2019.08.253
Page Range:pp. 27190-27203
Publisher:Elsevier
ISSN:0360-3199
Status:Published
Keywords:bubble evolution; bubble force balance; two-phase flow; PEM electrolysis; bubble detection
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Electrolysis and Hydrogen
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Elektrochemical Processes (Electrolysis)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Friedrich, Prof.Dr. Kaspar Andreas
Deposited On:07 Jan 2020 12:56
Last Modified:07 Jan 2020 12:56

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