Modification of Nafion (R) Using 3-mercaptopropyl Trimethoxysilane
- Authors
- Lee, Hyejung; Park, Sung Bum; Oh, Myung-Hoon; Coo, Kyungsik; Park, Yong-il; Suzuki, Satoshi; Nagai, Masayuki; Prinz, Fritz B.
- Issue Date
- Apr-2010
- Publisher
- KOREAN PHYSICAL SOC
- Keywords
- Proton-conducting membrane; Nafion; 3-mercaptopropyl trimethoxysilane; Direct methanol fuel cell
- Citation
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.56, no.4, pp.1215 - 1222
- Journal Title
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY
- Volume
- 56
- Number
- 4
- Start Page
- 1215
- End Page
- 1222
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/2783
- DOI
- 10.3938/jkps.56.1215
- ISSN
- 0374-4884
- Abstract
- The modification of a Nafion (R) membrane by incorporation of 3-mercaptopropyltrimethoxysilane (MPTS) is investigated through a simple sol-gel process to reduce the methanol crossover without sacrificing the proton conductivity. The MPTS monomers incorporated in the Nation (R) matrix are hydrolyzed, forming a silicate phase by polymerization. The thiols of MPTS are finally oxidized into a sulfonic acid form. Compared to Nation (R), the obtained modified membranes show significantly reduced solvent uptake with an accompanying low volume expansion ratio. A maximum 42% methanol crossover reduction is observed with improved proton conductivity. The proton conductivities of the obtained membranes increase from 8.0 x 10(-3) Scm(-1) to 1.9 x 10(-2) Scm(-1) at 70 degrees C with increasing MPTS amount from 0 to 1.96 wt%. The low methanol crossover and the high proton conductivity of the modified membranes are attributable to the MPTS-derived silicate phase blocking the ionic cluster pathway and to the simultaneous supply of a high sulfonic acid concentration to the Nation (R) matrix.
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