View Item 
      •   Home
      • 1. Schools
      • College of Engineering
      • School of Mechanical and Aerospace Engineering (MAE)
      • MAE Journal Articles
      • View Item
      •   Home
      • 1. Schools
      • College of Engineering
      • School of Mechanical and Aerospace Engineering (MAE)
      • MAE Journal Articles
      • View Item
      JavaScript is disabled for your browser. Some features of this site may not work without it.
      Subject Lookup

      Browse

      All of DR-NTUCommunities & CollectionsTitlesAuthorsBy DateSubjectsThis CollectionTitlesAuthorsBy DateSubjects

      My Account

      Login

      Statistics

      Most Popular ItemsStatistics by CountryMost Popular Authors

      About DR-NTU

      Correlation between proton conductivity, thermal stability and structural symmetries in novel HPW-meso-silica nanocomposite membranes and their performance in direct methanol fuel cells

      Thumbnail
      Author
      Zeng, Jie
      Shen, Pei Kong
      Lu, Shanfu
      Xiang, Yan
      Li, Lin
      De Marco, Roland
      Jiang, San Ping
      Date of Issue
      2012
      School
      School of Mechanical and Aerospace Engineering
      Abstract
      The intrinsic relationship between proton conductivity, thermal stability and structural symmetries of phosphotungstic acid (HPW)-functionalized mesoporous silica (HPW-meso-silica) membrane was investigated with mesoporous silica from 2D hexagonal p6mm, 3D face-centered cubic (View the MathML source), body-centered View the MathML source, to cubic bicontinuous View the MathML source symmetries. HPW-meso-silica nanocomposites with 3D mesostructures display a significantly higher proton conductivity and higher stability as a function of relative humidity in comparison to 2D mesostructures. The best result was obtained with body-centered cubic (View the MathML source)-HPW-meso-silica, showing proton conductivities of 0.061 S cm−1 at 25 °C and 0.14 S cm−1 at 150 °C, respectively, and an activation energy of 10.0 kJ mol−1. At 150 °C, the cell employing a HPW-meso-silica membrane produced a maximum power output of 237 mW cm−2 in a methanol fuel without external humidification. The high proton conductivity and excellent performance of the new methanol fuel cells demonstrate the promise of HPW-meso-silica nanocomposites with 3D mesostructures as a new class of inorganic proton exchange membranes for use in direct methanol fuel cells (DMFCs).
      Subject
      DRNTU::Engineering::Mechanical engineering
      Type
      Journal Article
      Series/Journal Title
      Journal of membrane science
      Collections
      • MAE Journal Articles
      http://dx.doi.org/10.1016/j.memsci.2012.01.018
      Get published version (via Digital Object Identifier)

      Show full item record


      NTU Library, Nanyang Avenue, Singapore 639798 © 2011 Nanyang Technological University. All rights reserved.
      DSpace software copyright © 2002-2015  DuraSpace
      Contact Us | Send Feedback
      Share |    
      Theme by 
      Atmire NV
       

       


      NTU Library, Nanyang Avenue, Singapore 639798 © 2011 Nanyang Technological University. All rights reserved.
      DSpace software copyright © 2002-2015  DuraSpace
      Contact Us | Send Feedback
      Share |    
      Theme by 
      Atmire NV
       

       

      DCSIMG