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Solar heat integrated solid oxide steam electrolysis for highly efficient hydrogen production

Schiller, Günter and Lang, Michael and Szabo, Patric and Monnerie, Nathalie and von Storch, Henrik and Reinhold, Jan Philipp and Sundarraj, Pradeepkumar (2019) Solar heat integrated solid oxide steam electrolysis for highly efficient hydrogen production. Journal of Power Sources, 416, pp. 72-78. Elsevier. DOI: 10.1016/j.jpowsour.2019.01.059 ISSN 0378-7753

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Water electrolysis is considered as a suitable pathway for the production of large amounts of hydrogen to be used as energy carrier for electricity storage. Among the existing water electrolysis technologies solid oxide steam electrolysis exhibits the highest electrical efficiency. Moreover, from thermodynamic considerations the efficiency can be further increased when part of the energy demand is provided by the integration of external high temperature heat to reduce the electrical energy for the water splitting reaction. This paper reports on the successful integration of solar heat into a solid oxide electrolyzer. The experimental setup of the prototype system consisting of a solar simulator, a solar steam generator, a steam accumulator and a solid oxide electrolyzer as well as first results with regard to solar steam generation and electrochemical performance of the electrolyzer are presented. Hot steam with a maxi- mum flow rate of 5.0 kgh-1 was produced with the solar steam generator. A small fraction (0.58 kgh-1) mixed with 10% of H2 was supplied to a 12-cell solid oxide electrolyzer stack with approx. 2 kW electrical power. At 770 °C and a current density of -1.25 Acm-2 a steam conversion rate of 70 % at 93% electrical electrolyzer efficiency was achieved.

Item URL in elib:https://elib.dlr.de/126480/
Document Type:Article
Additional Information:Open Access
Title:Solar heat integrated solid oxide steam electrolysis for highly efficient hydrogen production
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schiller, GünterGuenter.Schiller (at) dlr.dehttps://orcid.org/0000-0001-5093-7625
Lang, MichaelMichael.Lang (at) dlr.dehttps://orcid.org/0000-0001-7756-9658
Szabo, Patricpatric.szabo (at) dlr.deUNSPECIFIED
Monnerie, Nathalienathalie.monnerie (at) dlr.deUNSPECIFIED
von Storch, HenrikHenrik.vonStorch (at) dlr.dehttps://orcid.org/0000-0002-7067-5957
Reinhold, Jan PhilippJan.Reinhold (at) dlr.deUNSPECIFIED
Sundarraj, Pradeepkumarsundarraj.pradeepkumar (at) dlr.deUNSPECIFIED
Date:15 March 2019
Journal or Publication Title:Journal of Power Sources
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1016/j.jpowsour.2019.01.059
Page Range:pp. 72-78
Elsevier, L.www.elsevier.com/locate/jpowsour
Series Name:Elsevier Journal of Power Sources
Keywords:High temperature steam electrolysis (SOEC), solar heat integration, solar steam generator, solid oxide electrolyzer stack, hydrogen, electrochemical and thermal behavior
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: Schiller, Dr.rer.nat. Günter
Deposited On:25 Mar 2019 15:03
Last Modified:25 Mar 2019 15:03

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