Hydroxyl anion conducting membranes poly(vinyl alcohol)/ poly(diallyldimethylammonium chloride) for alkaline fuel cell applications: Effect of molecular weight

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DOIResolve DOI: http://doi.org/10.1016/j.electacta.2013.07.182
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TypeArticle
Journal titleElectrochimica Acta
ISSN0013-4686
Volume111
Pages351358; # of pages: 8
SubjectAlkaline anion-exchange membranes; Dense network structures; Hydroxide conductivities; Molecular weight effect; Poly (vinyl alcohol) (PVA); Poly(diallyldimethylammonium chloride); Single cell performance; Thermal gravity analysis; Alkaline fuel cells; Biomechanics; Chlorine compounds; Convergence of numerical methods; Fourier transform infrared spectroscopy; Ions; Mechanical properties; Membranes; Molecular weight; Polyvinyl alcohols; Scanning electron microscopy; Stability; Clarification
AbstractHydroxyl anion conducting membranes have been developed using poly(vinyl alcohol) (PVA) as polymermatrix by incorporation of poly(diallyldimethylammonium chloride) (PDDA) as anion charge carriers. PDDA of four different molecular weight (namely PDDA-HMw, PDDA-MMw, PDDA-LMw and PDDA-ULMw) was incorporated in order to clarifying the effect of molecular weight on membrane performances. The membranes are characterized in detail by FTIR spectroscopy, scanning electron microscopy (SEM), thermal gravity analysis (TG), mechanical property, AC impedance technique, water uptake, swelling ratio, oxidation and alkaline stability to evaluate their applicability in alkaline fuel cells. The OH -conductivity of the membranes was found to be increased with increasing molecular weight of PDDA, and the maximum OH-conductivity of 0.027 S cm-1was achieved for PVA/PDDA-HMw membrane. ThePVA/PDDA-HMw membrane also showed the best mechanical property and excellent thermal stability due to the most compact and dense network structure. All the membranes showed relatively highoxidative stability in 30% H2O2and strong alkaline stability in 2 M KOH for 624 h at room temperature. The fuel cell performances of the MEAs with these membranes were 18.2, 23.4, 28.5 and 35.1 mW cm-2using H2and O2gases at 25°C. The long-term stability of single-cell performance showed that the PVA/PDDA membrane could approximately last 80 h on the fuel cell with only a slight decrease of 0.1 V in cell potential. © 2013 Elsevier Ltd. All rights reserved.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Energy, Mining and Environment (EME-EME)
Peer reviewedYes
NPARC number21269923
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Record identifier88179986-8809-4f07-8daf-7ab68760bb26
Record created2013-12-13
Record modified2016-05-09
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