3. a composite membrane with an 'oxide in and on polymer' structure

Department: NanoEngineering
Research Institute Affiliation: Sustainable Power and Energy Center
Faculty Advisor(s): Ping Liu

Primary Student
Name: Xiujun Yue
Email: xiyue@ucsd.edu
Phone: 858-534-3796
Grad Year: 2018

To solve the trade-off between conductivity and selectivity, bottleneck problem of ion exchange membranes, a Nafion composite membrane with dense crack-free tungsten oxide coating layer was fabricated with ?oxide in and on polymer? structure. Oxide in polymer was in-situ synthesized in the ion clusters and oxide on polymer was coated via sol-gel method. Morphology and chemical component of the composite membrane were studied. With low water uptake and swelling ratio, the composite membrane exhibited enhanced thermal and mechanical stability. Maintaining comparable conductivity, the permeability of composite membrane for Fe(II) and Cr(III) ion were decreased by an order of magnitude, from 2.6610-7 cm2s-1 and 8.8410-8 cm2s-1 to 2.3110-8 cm2s-1 and 8.3410-9 cm2s-1 respectively. Noticeably, the dense oxide coating layer showed three orders of magnitude lower permeability than Nafion.

Industry Application Area(s)
Energy/Clean technology | Materials

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