Enhanced Proton Conductivity and Methanol Permeability Reduction via Sodium Alginate Electrolyte-Sulfonated Graphene Oxide Bio-membrane

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Abstract

The high methanol crossover and high cost of Nafion® membrane are the major challenges for direct methanol fuel cell application. With the aim of solving these problems, a non-Nafion polymer electrolyte membrane with low methanol permeability and high proton conductivity based on the sodium alginate (SA) polymer as the matrix and sulfonated graphene oxide (SGO) as an inorganic filler (0.02-0.2 wt%) was prepared by a simple solution casting technique. The strong electrostatic attraction between -SO3H of SGO and the sodium alginate polymer increased the mechanical stability, optimized the water absorption and thus inhibited the methanol crossover in the membrane. The optimum properties and performances were presented by the SA/SGO membrane with a loading of 0.2 wt% SGO, which gave a proton conductivity of 13.2 × 10−3 Scm−1, and the methanol permeability was 1.535 × 10−7 cm2 s−1 at 25 °C, far below that of Nafion (25.1 × 10−7 cm2 s−1) at 25 °C. The mechanical properties of the sodium alginate polymer in terms of tensile strength and elongation at break were improved by the addition of SGO.

Original languageEnglish
Article number82
JournalNanoscale Research Letters
Volume13
DOIs
Publication statusPublished - 1 Jan 2018

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Sodium alginate
Proton conductivity
Graphite
Oxides
Graphene
Electrolytes
Methanol
permeability
graphene
methyl alcohol
sodium
electrolytes
membranes
Membranes
Polymers
conductivity
protons
oxides
polymers
crossovers

Keywords

  • Bio-membrane
  • DMFC
  • Sodium alginate
  • Sulfonated graphene oxide

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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title = "Enhanced Proton Conductivity and Methanol Permeability Reduction via Sodium Alginate Electrolyte-Sulfonated Graphene Oxide Bio-membrane",
abstract = "The high methanol crossover and high cost of Nafion{\circledR} membrane are the major challenges for direct methanol fuel cell application. With the aim of solving these problems, a non-Nafion polymer electrolyte membrane with low methanol permeability and high proton conductivity based on the sodium alginate (SA) polymer as the matrix and sulfonated graphene oxide (SGO) as an inorganic filler (0.02-0.2 wt{\%}) was prepared by a simple solution casting technique. The strong electrostatic attraction between -SO3H of SGO and the sodium alginate polymer increased the mechanical stability, optimized the water absorption and thus inhibited the methanol crossover in the membrane. The optimum properties and performances were presented by the SA/SGO membrane with a loading of 0.2 wt{\%} SGO, which gave a proton conductivity of 13.2 × 10−3 Scm−1, and the methanol permeability was 1.535 × 10−7 cm2 s−1 at 25 °C, far below that of Nafion (25.1 × 10−7 cm2 s−1) at 25 °C. The mechanical properties of the sodium alginate polymer in terms of tensile strength and elongation at break were improved by the addition of SGO.",
keywords = "Bio-membrane, DMFC, Sodium alginate, Sulfonated graphene oxide",
author = "N. Shaari and Kamarudin, {Siti Kartom} and S. Basri and Loh, {Kee Shyuan} and {Mastar @ Masdar}, {Mohd Shahbudin} and Darman Nordin",
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AU - Basri, S.

AU - Loh, Kee Shyuan

AU - Mastar @ Masdar, Mohd Shahbudin

AU - Nordin, Darman

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