New sulfonic acid moiety grafted on montmorillonite as filler of organic-inorganic composite membrane for non-humidified proton-exchange membrane fuel cells
SCIE
SCOPUS
- Title
- New sulfonic acid moiety grafted on montmorillonite as filler of organic-inorganic composite membrane for non-humidified proton-exchange membrane fuel cells
- Authors
- Kim, Y; Choi, Y; Kim, HK; Lee, JS
- Date Issued
- 2010-08-01
- Publisher
- ELSEVIER SCIENCE BV
- Abstract
- A new organic sulfonic acid moiety is grafted on the surface of montmorillonite (MMT) by a condensation reaction of the surface hydroxyl group of MMT with the thiol group of 3-mercaptopropyltrimethoxy silane (3-MPTMS), and simultaneously attaching sulfonic acid group by a ring opening reaction of 1,3-propane sultone. The new method produces MMT functionalized with sulfonic acid of a longer chain length in a simple one-step reaction and shows higher ion-exchange capacity and thermal stability than MMT grafted by a two-step method of 3-MPTMS condensation followed by oxidation with H2O2. Using these functionalized MMTs as inorganic fillers, organic-inorganic composite, proton-conducting membranes are cast together with Nafion (R). The composite membrane with MMT grafted with the long-chain sulfonic acid shows increased water uptake, while maintaining comparable ionic conductivity relative to a pristine Nation membrane. This leads to much enhanced performance of a proton-exchange membrane fuel cell without external humidification of reactant gases. For instance, the current density at 0.5 V of the membrane-electrode assembly (MEA) fabricated with a composite membrane containing MMT with the long-chain organic sulfonic acid is about twice that of a MEA fabricated with a composite membrane containing MMT with short-chain organic sulfonic acids and about three times higher than that with pristine Nation 212. (C) 2010 Elsevier B.V. All rights reserved.
- Keywords
- Surface functionalization; Organic-inorganic composite membranes; Proton-exchange membrane fuel cell; Non-humidified operation; LAYERED SILICATE NANOCOMPOSITES; BARRIER PROPERTIES; MAS NMR; POLYMER; ELECTROLYTE; NAFION(R); PERFORMANCE; DERIVATIVES; OPERATION
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/25436
- DOI
- 10.1016/J.JPOWSOUR.2010.01.087
- ISSN
- 0378-7753
- Article Type
- Article
- Citation
- JOURNAL OF POWER SOURCES, vol. 195, no. 15, page. 4653 - 4659, 2010-08-01
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