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Understanding the Role of Water Flow and the Porous Transport Layer on the Performance of Proton Exchange Membrane Water Electrolyzers

Garcia-Navarro, Julio Cesar and Schulze, Mathias and Friedrich, Kaspar Andreas (2019) Understanding the Role of Water Flow and the Porous Transport Layer on the Performance of Proton Exchange Membrane Water Electrolyzers. ACS Sustainable Chemistry and Engineering, 7, pp. 1600-1610. American Chemical society (ACS). DOI: 10.1021/acssuschemeng.8b05369 ISSN 2168-0485

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Abstract

In this article, we have brought a different perspective to the topic of mass transport losses in a proton exchange membrane (PEM) water electrolyzer, particularly regarding the role of water flow and the dominant mass transport mechanism in the porous transport layer (PTL). We conducted permeation experiments on a sintered Ti PTL, where we measured the pressure loss of gas that flows through its pores; furthermore, we presented a model based on the van Genuchten−Mualem capillary pressure and the Carman−Kozeny gas permeability, and we report an increase in the pressure loss with respect to the water flow, which we reported as an increase in the apparent tortuosity of the pores in the PTL. From this we conclude that the water flow exerts a shear stress on the gas flowing through the PTL, proportional to its kinetic energy, and that the gas permeation is the dominant transport mechanism within a PTL, in contrast to a one- or two-phase flow, which is more energy demanding. Finally, we propose that further work be carried out, in particular by comparing these results to in situ measurements on an operating PEM electrolyzer.

Item URL in elib:https://elib.dlr.de/133202/
Document Type:Article
Title:Understanding the Role of Water Flow and the Porous Transport Layer on the Performance of Proton Exchange Membrane Water Electrolyzers
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Garcia-Navarro, Julio Cesarjulio.garcianavarro (at) dlr.dehttps://orcid.org/0000-0002-3177-5023
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:ACS Sustainable Chemistry and Engineering
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:7
DOI :10.1021/acssuschemeng.8b05369
Page Range:pp. 1600-1610
Publisher:American Chemical society (ACS)
ISSN:2168-0485
Status:Published
Keywords:Polymer membrane electrolysis hydrogen generation
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 12:52
Last Modified:07 Jan 2020 12:52

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