Hwang, Myungseop Ha, Heung-Yong Kim, Dukjoon 2024-01-20T22:05:18Z 2024-01-20T22:05:18Z 2021-08-31 2008-12-01 0376-7388 https://pubs.kist.re.kr/handle/201004/132896 Zirconium meta-sulfonphenyl phosphonic acid (Zr-msPPA)/Nafion (R) composite membranes were prepared to reduce methanol permeability of the Nafion (R) 117 membrane in direct methanol fuel cell (DMFC) applications. Zr-msPPA crystalline nano proton conductors were synthesized inside the membranes via the reaction of zirconium chloride octahydrate and meta-sulfonphenyl phosphonic acid that had been soaked prior. Synthesis of the Zr-msPPA in the membranes was identified from a series of chemical and physical structure characterizations using FTIR, NMR, EDS, and XRD spectroscopy. The thermal stability of the composite membranes was enhanced by addition of the Zr-msPPA, with considerable reduction in methanol permeability with increasing Zr-msPPA content, as the Zr-msPPA nano conductors acted as crystalline barriers to methanol permeation. The ion conductivity also decreased with increasing Zr-msPPA content, but its effect was not as strong as with methanol permeation given the innate, high conductivity of Zr-msPPA. (C) 2008 Elsevier B.V. All rights reserved. English ELSEVIER CROSSOVER PROTON Zirconium meta-sulfonphenyl phosphonic acid-incorporated Nafion (R) membranes for reduction of methanol permeability Article 10.1016/j.memsci.2008.08.032 1 JOURNAL OF MEMBRANE SCIENCE, v.325, no.2, pp.647 - 652 JOURNAL OF MEMBRANE SCIENCE 325 2 647 652 scie scopus 000262946800018 2-s2.0-55549142978 Engineering, Chemical Polymer Science Engineering Polymer Science Article CROSSOVER PROTON Direct methanol fuel cell Nafion (R) Membrane Methanol permeability Proton conductivity