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Article: Water management issues for direct borohydride/peroxide fuel cells

TitleWater management issues for direct borohydride/peroxide fuel cells
Authors
KeywordsFuel Cell
Hydrogen Peroxide
Sodium Borohydride
Water Management
Issue Date2010
PublisherAmerican Society of Mechanical Engineers. The Journal's web site is located at http://scitation/aip.org/ASMEJournals/FuelCell/
Citation
Journal Of Fuel Cell Science And Technology, 2010, v. 7 n. 2, p. 0245011-0245015 How to Cite?
AbstractThis study evaluated water management strategies to lengthen the run time of a batch fueled direct sodium borohydride/peroxide (NaBH4/H 2O2) proton exchange membrane fuel cell. The term "batch fueled" refers specifically to a fuel tank containing a fixed volume of fuels for use in the run. The length of a run using a fixed fuel tank is strongly influenced by water dynamics. The water that reacts at the anode is produced at the cathode, and is transported through the membrane via drag and diffusion. Resulting concentration changes in the fuel of the NaBH 4/H2O2 fuel cell were modeled to evaluate the run lifetime. The run time is defined as the amount of time required for NaBH4 or for NaBO2 (the byproduct compound) to reach either solubility limit or until the fuel is depleted, whichever occurs first. As part of the evaluation, an "effective" H2O drag coefficient (net drag minus back diffusion) with Nafion® 112 was experimentally determined to be 1.14 and 4.36 at 25° C and 60°C, respectively. The concentrations of the NaBH4 and NaBO2 solutions were calculated as a function of initial concentration, and for the case where H2O was supplied to the anode compartment during operation. Several strategies to increase the run time by both passive and active water management were considered. It is found that the run time is increased from 10 W h to 57 W h, with a decrease in the initial NaBH4 concentration from 30 wt % (typically employed in these cells) to 10 wt %. Adding 0.125 ml/min H2O to the bulk anode solution increases the run time of a 10 wt % NaBH4 solution by a factor of 1.6. Adding 0.225 ml/min H2O to 30 wt % NaBH4 bulk solution increases the run time by a factor of 4.4. While attractive for increasing run time, the practicality of water addition depends on its availability or requires incorporation of an added unit, designed to separate and recirculate water from the cathode solution. Copyright © 2010 by ASME.
Persistent Identifierhttp://hdl.handle.net/10722/188462
ISSN
2015 Impact Factor: 0.711
2015 SCImago Journal Rankings: 0.221
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorLux, Sen_US
dc.contributor.authorGu, Len_US
dc.contributor.authorKopec, Gen_US
dc.contributor.authorBernas, Ren_US
dc.contributor.authorMiley, Gen_US
dc.date.accessioned2013-09-03T04:07:44Z-
dc.date.available2013-09-03T04:07:44Z-
dc.date.issued2010en_US
dc.identifier.citationJournal Of Fuel Cell Science And Technology, 2010, v. 7 n. 2, p. 0245011-0245015en_US
dc.identifier.issn1550-624Xen_US
dc.identifier.urihttp://hdl.handle.net/10722/188462-
dc.description.abstractThis study evaluated water management strategies to lengthen the run time of a batch fueled direct sodium borohydride/peroxide (NaBH4/H 2O2) proton exchange membrane fuel cell. The term "batch fueled" refers specifically to a fuel tank containing a fixed volume of fuels for use in the run. The length of a run using a fixed fuel tank is strongly influenced by water dynamics. The water that reacts at the anode is produced at the cathode, and is transported through the membrane via drag and diffusion. Resulting concentration changes in the fuel of the NaBH 4/H2O2 fuel cell were modeled to evaluate the run lifetime. The run time is defined as the amount of time required for NaBH4 or for NaBO2 (the byproduct compound) to reach either solubility limit or until the fuel is depleted, whichever occurs first. As part of the evaluation, an "effective" H2O drag coefficient (net drag minus back diffusion) with Nafion® 112 was experimentally determined to be 1.14 and 4.36 at 25° C and 60°C, respectively. The concentrations of the NaBH4 and NaBO2 solutions were calculated as a function of initial concentration, and for the case where H2O was supplied to the anode compartment during operation. Several strategies to increase the run time by both passive and active water management were considered. It is found that the run time is increased from 10 W h to 57 W h, with a decrease in the initial NaBH4 concentration from 30 wt % (typically employed in these cells) to 10 wt %. Adding 0.125 ml/min H2O to the bulk anode solution increases the run time of a 10 wt % NaBH4 solution by a factor of 1.6. Adding 0.225 ml/min H2O to 30 wt % NaBH4 bulk solution increases the run time by a factor of 4.4. While attractive for increasing run time, the practicality of water addition depends on its availability or requires incorporation of an added unit, designed to separate and recirculate water from the cathode solution. Copyright © 2010 by ASME.en_US
dc.languageengen_US
dc.publisherAmerican Society of Mechanical Engineers. The Journal's web site is located at http://scitation/aip.org/ASMEJournals/FuelCell/en_US
dc.relation.ispartofJournal of Fuel Cell Science and Technologyen_US
dc.subjectFuel Cellen_US
dc.subjectHydrogen Peroxideen_US
dc.subjectSodium Borohydrideen_US
dc.subjectWater Managementen_US
dc.titleWater management issues for direct borohydride/peroxide fuel cellsen_US
dc.typeArticleen_US
dc.identifier.emailGu, L: oliviagu@hku.hken_US
dc.identifier.authorityGu, L=rp01802en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1115/1.3176218en_US
dc.identifier.scopuseid_2-s2.0-77955449814en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77955449814&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume7en_US
dc.identifier.issue2en_US
dc.identifier.spage0245011en_US
dc.identifier.epage0245015en_US
dc.identifier.isiWOS:000274013200025-
dc.publisher.placeUnited Statesen_US
dc.identifier.scopusauthoridLux, S=7005576974en_US
dc.identifier.scopusauthoridGu, L=16022007800en_US
dc.identifier.scopusauthoridKopec, G=36446079800en_US
dc.identifier.scopusauthoridBernas, R=35408789500en_US
dc.identifier.scopusauthoridMiley, G=34872774500en_US

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