Blend Membranes Consisting of Sulfonated Poly(ether ether ketone) and Polysulfone Bearing 4-Nitrobenzimidazole for Direct Methanol Fuel Cells
Open accessAbstract
Low-cost blend membranes consisting of sulfonated poly(ether ether ketone) (SPEEK) (an acidic polymer) and polysulfone-4-nitrobenzimidazole (PSf-NBIm) (a basic polymer) have been prepared with various PSf–NBIm contents and characterized by ion-exchange capacity, proton conductivity, and water uptake measurements. The blend membranes with PSf–NBIm contents of 2.5 and show higher proton conductivity and lower water uptake in water and methanol/water solutions at a given temperature than plain SPEEK. The blend membranes also exhibit better electrochemical performance and lower methanol crossover in a direct methanol fuel cell than plain SPEEK and Nafion 115 membranes due to an enhancement in proton conductivity through acid-base interactions and an insertion of the benzimidazole side groups into the ionic clusters of SPEEK, as indicated by small-angle X-ray scattering. The maximum power density of the blend membrane with a PSf–NBIm content of is 1.5 times higher than that of the Nafion 115 in methanol solution at .
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The pKa values of the heterocycles can influence the proton conductivity of this type of blend membrane.
“Additionally, as we reported before [22], the pK a values of the heterocycles could also influence the proton conductivity of this type of blend membranes.”
From Acid–base blend membranes consisting of sulfonated poly(ether ether ketone) and 5-amino-benzotriazole tethered polysulfone for DMFC (2010) · cites this paper as [22]
Inserting heterocycles into the ionic clusters formed by sulfonic acid groups could widen proton transfer channels and enhance the vehicle mechanism.
“Moreover, the insertion of the heterocycles into the ionic clusters formed by the sulfonic acid groups could broaden the proton transfer channels [22,23], resulting in an enhancement in the vehicle mechanism.”
From Acid–base blend membranes consisting of sulfonated poly(ether ether ketone) and 5-amino-benzotriazole tethered polysulfone for DMFC (2010) · cites this paper as [22]
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- Authors
- Li, W., Fu, Y.-Z., Manthiram, A., & Guiver, M. D.
- Affiliations
- The University of Texas at Austin (US)
- National Research Council Canada (CA)
- Venue
- Journal of The Electrochemical Society
- Publisher
- The Electrochemical Society
- Published
- 2009
- Volume
- 156
- Issue
- 2
- Pages
- B258
- ISSN
- 0013-4651 (ISSN-L)
- OpenAlex
- W1999456274
- Semantic Scholar
- 55f371a760d6ef14614082bda796e76b89c91189
- Cited by
- 23
- References
- 38
- Citations by year
- 2024: 1 · 2020: 1 · 2019: 1 · 2018: 1 · 2017: 1 · 2015: 2 · 2014: 1 · 2013: 3 · 2012: 3
- FWCI
- 2.69
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of The Electrochemical Society (publishedVersion)
- NPARC (submittedVersion)
- Funders
- Multidisciplinary University Research Initiative
- Office of Naval Research (N00014-07-1-0758, N00014)
- Topics
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Fuel Cells and Related Materials
- Physical Sciences › Materials Science › Materials Chemistry › Advancements in Solid Oxide Fuel Cells
- Physical Sciences › Engineering › Biomedical Engineering › Membrane-based Ion Separation Techniques
- Keywords
- sulfonated poly(ether ether ketone), blend membranes, direct methanol fuel cells, proton conductivity, methanol crossover, acid-base interactions, ion exchange capacity, water absorption, Nafion 115, small-angle X-ray scattering, power density
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