Tuesday, 1 November 2005 - 2:13 PM
214f

Nafion/Zeolite Nanocomposite Membrane for Direct Methanol Fuel Cell

Zhongwei Chen1, Brett A. Holmberg1, Wenzhen Li2, Xin Wang3, and Yushan Yan1. (1) University of California, Riverside, A242 Bourns Hall, Chemical Engineering, Riverside, CA 92507, (2) Chemical and Environmental Engineering, University of California, Riverside, Bourns Hall A242, Riverside, CA 92521, (3) Department of Chemical and Environmental Engineering, University of California, Riverside, Department of Chemical and Environmental Engineering, University of California, Riverside, Riverside, CA 92507

Nafion/zeolite nanocomposite membranes have been fabricated by in situ hydrothermal growth of acid functionalized zeolite Beta (AF-Beta) nanocrystals into commercial Nafion membranes for direct methanol fuel cells (DMFCs). The presence of zeolite nanocrystals in the composite membrane is confirmed by energy-dispersive X-ray analysis (EDAX) and X-ray diffraction (XRD). Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) were used to show the homogeneous composite membrane structure. The physicochemical properties of all membranes were studied regarding their tensile strength, water uptake and thermogravimetric analyzer (TGA). Compared with Nafion membrane, the composite membrane has slightly lower (about 3% reduction) proton conductivity, but much lower methanol permeability (about 40% reduction). The performance of DMFC with Nafion/AF-Beta composite membrane shows much higher (14%) OCV and 25% increase in maximum power density compared with Nafion commercial membrane. The new nanocomposite membrane is a promising candidate for DMFC applications.

See more of #214 - Fuel Cell Membranes I (02D11)
See more of Separations Division

See more of The 2005 Annual Meeting (Cincinnati, OH)