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dc.contributor.author
Hashemi, S. Mohammad H.
dc.contributor.author
Karnakov, Petr
dc.contributor.author
Hadikhani, Pooria
dc.contributor.author
Chinello, Enrico
dc.contributor.author
Litvinov, Sergey
dc.contributor.author
Moser, Christophe
dc.contributor.author
Koumoutsakos, Petros
dc.contributor.author
Psaltis, Demetri
dc.date.accessioned
2019-06-03T09:11:54Z
dc.date.available
2019-06-01T02:31:24Z
dc.date.available
2019-06-03T09:11:54Z
dc.date.issued
2019-05-01
dc.identifier.other
10.1039/c9ee00219g
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/344975
dc.identifier.doi
10.3929/ethz-b-000344975
dc.description.abstract
Renewables challenge the management of energy supply and demand due to their intermittency. A promising solution is the direct conversion of the excess electrical energy into valuable chemicals in electrochemical reactors that are inexpensive, scalable, and compatible with irregular availability of electrical power. Membrane-less electrolyzers, deployed on a microfluidic platform, were recently shown to hold great promise for efficient electrolysis and cost-effective operation. The elimination of the membrane increases the reactor lifetime, reduces fabrication costs, and enables the deployment of liquid electrolytes with ionic conductivities that surpass those allowed by solid membranes. Here, we demonstrate a membrane-less architecture that enables unprecedented throughput by 3D printing a device that combines components such as the flow plates and the fluidic ports in a monolithic part, while at the same time, providing tight tolerances and smooth surfaces for precise flow conditioning. We show that inertial fluidic forces are effective even in millifluidic regimes and, therefore, are utilized to control the two-phase flows inside the device and prevent cross-contamination of the products. Simulations provide insight on governing fluid dynamics of coalescing bubbles and their rapid jumps away from the electrodes and help identify three key mechanisms for their fast and intriguing return towards the electrodes. Experiments and simulations are used to demonstrate the efficiency of the inertial separation mechanism in millichannels and at higher flow rates than in microchannels. We analyze the performance of the present device for two reactions: water splitting and the chlor-alkali process, and find product purities of more than 99% and Faradaic efficiencies of more than 90%. The present membrane-less reactor – containing more efficient catalysts – provides close to 40 times higher throughput than its microfluidic counterpart and paves the way for realization of cost-effective and scalable electrochemical stacks that meet the performance and price targets of the renewable energy sector.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Royal Society of Chemistry
en_US
dc.rights.uri
http://creativecommons.org/licenses/by-nc/3.0/
dc.title
A versatile and membrane-less electrochemical reactor for the electrolysis of water and brine
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution-NonCommercial 3.0 Unported
dc.date.published
2019-03-05
ethz.journal.title
Energy & Environmental Science
ethz.journal.volume
12
en_US
ethz.journal.issue
5
en_US
ethz.pages.start
1592
en_US
ethz.pages.end
1604
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Cambridge
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2019-06-01T02:31:31Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2019-06-03T09:12:27Z
ethz.rosetta.lastUpdated
2019-06-03T09:12:28Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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