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dc.contributor.authorSkilbred, Ellen Synnøve
dc.contributor.authorKrakhella, Kjersti Wergeland
dc.contributor.authorHaga, Ida Johanne
dc.contributor.authorPharoah, Jon
dc.contributor.authorHillestad, Magne
dc.contributor.authordel Alamo Serrano, Gonzalo
dc.contributor.authorBurheim, Odne Stokke
dc.date.accessioned2019-02-11T13:55:47Z
dc.date.available2019-02-11T13:55:47Z
dc.date.created2018-08-10T15:04:03Z
dc.date.issued2018
dc.identifier.citationECS Transactions. 2018, 85 (13), 147-161.nb_NO
dc.identifier.issn1938-5862
dc.identifier.urihttp://hdl.handle.net/11250/2584837
dc.description.abstractThe present work suggests two concepts for producing hydrogen by reverse electrodialysis. Reverse electrodialysis is a technology that uses concentration differences to create electrical energy. In this work, the energy is utilised as direct hydrogen production within a closed-loop system. For both system alternatives, waste heat is used to set up the mentioned concentration differences. The first concept is evaporation, where heat is added to boil off excess water from a concentrated solution and thereby increase its concentration. The second concept removes heat in order to precipitate excess salt. For the precipitation concept to work, a salt where the solubility is highly dependent on temperature must be used. KNO3 fulfils this requirement. As part of a proof of concept, the conductivity of membranes soaked in KNO3 was investigated. The conductivity of the salt in two commercialised membranes, Fumatech FKE-50 and FAS-30, was measured and compared to NaCl in the same membranes. The conductivity of K+ in FKE-50 was found to be 4.5 and 6.6 mS cm−1 at 25◦C and 40◦C respectively. The conductivity of NO−3 in FAS-30 was found to be 4.3 mS cm−1 and 6.5 mS cm−1 at 25◦C and 40◦C respectively. Neither of the membranes change conductivity with soaking concentrations. The conductivity at 40◦C compared to 25◦C is significantly better in the FKE membrane, and seemingly better in the FAS membrane. Potential peak power densities for a RED unit cell is 1.29 W m−2 with the precipitation system, and 28.1 W m−2 when evaporation is used.nb_NO
dc.language.isoengnb_NO
dc.publisherElectrochemical Societynb_NO
dc.titleHeat to H2: Using Waste Heat to Set Up Concentration Differences for Reverse Electrodialysis Hydrogen Productionnb_NO
dc.title.alternativeHeat to H2: Using Waste Heat to Set Up Concentration Differences for Reverse Electrodialysis Hydrogen Productionnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber147-161nb_NO
dc.source.volume85nb_NO
dc.source.journalECS Transactionsnb_NO
dc.source.issue13nb_NO
dc.identifier.doi10.1149/08513.0147ecst
dc.identifier.cristin1601066
dc.description.localcode© 2018. This is the authors' accepted and refereed manuscript to the article. The final authenticated version is available online at: http://dx.doi.org/10.1149/08513.0147ecstnb_NO
cristin.unitcode194,64,25,0
cristin.unitcode194,66,30,0
cristin.unitnameInstitutt for energi- og prosessteknikk
cristin.unitnameInstitutt for kjemisk prosessteknologi
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode1


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