Increasing the electrolyte capacity of Alkaline Zn-Air fuel cells by scavenging Zincate with Ca(OH)2

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DOIResolve DOI: http://doi.org/10.1002/celc.201402251
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TypeArticle
Journal titleChemElectroChem
ISSN2196-0216
Volume2
Issue1
Pages134142; # of pages: 9
SubjectAlkaline fuel cells; Electrolytes; Fuel cells; Hydrated lime; Scavenging; Zinc oxide; Discharge capacities; Effective approaches; Optimal performance; Theoretical approach; Water compensation; Zinc air fuel cells; Zincates; Calcium
AbstractThe use of calcium hydroxide for scavenging zincate species is demonstrated to be a highly effective approach for increasing the electrolyte capacity and improving the performance of the zinc-air fuel cell system. A fundamental approach is established in this study to quantify the formation of calcium zincate as the product of scavenging and the amount of water compensation necessary for optimal performance. The good agreement between predicted and experimental results proves the validity of the proposed theoretical approach. By applying the results of theoretical predictions, both the electrolyte capacity and the cell longevity have been increased by more than 40%. It is also found that, using Ca(OH)2 to scavenge zincate species in concentrated KOH solutions, affects mostly the removal of zincate, rather than ZnO, from the electrolyte, whereas the presence of excess, free, mobile H2O plays a key role in dissolving ZnO and forming zincate. The results obtained in this study demonstrate that the proposed approach can widely and effectively be applied to all zinc-air cell systems during their discharge cycle.
Publication date
LanguageEnglish
AffiliationNRC Institute for Fuel Cell Innovation; Energy, Mining and Environment; National Research Council Canada
Peer reviewedYes
NPARC number21276910
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Record identifierf9113253-c5eb-4fa4-a0e2-2feb428b1d1d
Record created2015-11-10
Record modified2016-05-09
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