Sodium-alginate-based proton-exchange membranes as electrolytes for DMFCs

Novel mixed-matrix membranes prepared by blending sodium alginate (NaAlg) with polyvinyl alcohol (PVA) and certain heteropolyacids (HPAs), such as phosphomolybdic acid (PMoA), phosphotungstic acid (PWA) and silicotungstic acid (SWA), followed by ex - situ cross-linking with glutaraldehyde (GA) to ac...

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Veröffentlicht in:Energy & environmental science 2010-01, Vol.3 (11), p.1746-1756
Hauptverfasser: Mohanapriya, S, Bhat, S. D, Sahu, A. K, Manokaran, A, Vijayakumar, R, Pitchumani, S, Sridhar, P, Shukla, A. K
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container_end_page 1756
container_issue 11
container_start_page 1746
container_title Energy & environmental science
container_volume 3
creator Mohanapriya, S
Bhat, S. D
Sahu, A. K
Manokaran, A
Vijayakumar, R
Pitchumani, S
Sridhar, P
Shukla, A. K
description Novel mixed-matrix membranes prepared by blending sodium alginate (NaAlg) with polyvinyl alcohol (PVA) and certain heteropolyacids (HPAs), such as phosphomolybdic acid (PMoA), phosphotungstic acid (PWA) and silicotungstic acid (SWA), followed by ex - situ cross-linking with glutaraldehyde (GA) to achieve the desired mechanical and chemical stability, are reported for use as electrolytes in direct methanol fuel cells (DMFCs). NaAlg-PVA-HPA mixed matrices possess a polymeric network with micro-domains that restrict methanol cross-over. The mixed-matrix membranes are characterised for their mechanical and thermal properties. Methanol cross-over rates across NaAlg-PVA and NaAlg-PVA-HPA mixed-matrix membranes are studied by measuring the mass balance of methanol using a density meter. The DMFC using NaAlg-PVA-SWA exhibits a peak power-density of 68 mW cm −2 at a load current-density of 225 mA cm −2 , while operating at 343 K. The rheological properties of NaAlg and NaAlg-PVA-SWA viscous solutions are studied and their behaviour validated by a non-Newtonian power-law. A modified sodium alginate proton exchange membrane by incorporation of heteropolyacids for direct methanol fuel cells is reported.
doi_str_mv 10.1039/c0ee00033g
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title Sodium-alginate-based proton-exchange membranes as electrolytes for DMFCs
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