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Polyelectrolyte nanocomposite membranes using imidazole-functionalized nanosilica for fuel cell applications

Tohidian, M ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1080/00222348.2014.982485
  3. Publisher: Taylor and Francis Inc , 2015
  4. Abstract:
  5. The preparation and characterization of a new type of nanocomposite polyelectrolyte membrane, based on DuPont Nafion/imidazole-modified nanosilica (Im-Si), for direct methanol fuel cell applications is described. Related to the interactions between the protonated imidazole groups, grafted on the surface of nanosilica, and negatively charged sulfonic acid groups of Nafion, new electrostatic interactions can be formed in the interface of Nafion and Im-Si which result in both lower methanol permeability and also higher proton conductivity. Physical characteristics of these manufactured nanocomposite membranes were investigated by scanning electron microscopy, thermogravimetry analysis, differential scanning calorimetry, Fourier transform infrared spectroscopy, water uptake, methanol permeability, and ion-exchange capacity, as well as proton conductivity. The Nafion/Im-Si membranes showed higher proton conductivity, lower methanol permeability and, as a consequence, higher selectivity parameter in comparison to the neat Nafion or Nafion/silica membranes. The obtained results indicated that the Nafion/Im-Si membranes could be utilized as promising polyelectrolyte membranes for direct methanol fuel cell applications
  6. Keywords:
  7. Imidazole ; Nafion ; Differential scanning calorimetry ; Fourier transform infrared spectroscopy ; Fuel cells ; Ion exchange ; Ion exchange membranes ; Methanol ; Methanol fuels ; Nanocomposites ; Polyelectrolytes ; Proton conductivity ; Scanning electron microscopy ; Silicon ; Nano-composite membranes ; Nano-silica ; Physical characteristics ; Polyelectrolyte membranes ; Polyelectrolyte nanocomposite ; Thermogravimetry analysis ; Direct methanol fuel cells (DMFC)
  8. Source: Journal of Macromolecular Science, Part B: Physics ; Volume 54, Issue 1 , Nov , 2015 , Pages 17-31 ; 00222348 (ISSN)
  9. URL: http://www.tandfonline.com/doi/abs/10.1080/00222348.2014.982485