Performance of quaternized poly(vinyl alcohol)-based electrolyte membrane in passive alkaline DEFCs application: RSM optimization approach

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Abstract

Direct ethanol fuel cells (DEFCs) have emerged as potential tools for producing sustainable energy for portable devices due to their high energy density and their safe and nontoxic fuel source. However, the main problem of DEFCs is the sluggish oxidation of ethanol and fuel crossover from the anode side to the cathode side. Nafion membranes are commonly used as the electrolyte membrane in DEFCs, but they have a high production cost and high ethanol permeability. Thus, this work studies the performance of an alternative electrolyte membrane that is based on a quaternized poly(vinyl alcohol) (QPVA) polymer in passive alkaline DEFCs. The composition of the QPVA-based membranes was optimized with potassium hydroxide (KOH) as an ion charge carrier and by the inorganic filler graphene oxide (GO). The membrane properties were influenced by KOH and GO. The effect of these two parameters on the performance of the QPVA-based membranes was investigated for its ion-exchange capacity and ionic conductivity and selectivity using the response surface methodology to optimize the membrane composition. The QPVA-based membranes were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, and field emission scanning electron microscope. The membrane properties were influenced by KOH concentration doping and GO filler loading, which affect the membrane selectivity and, consequently, the overall performance of the passive alkaline DEFCs. Finally, the maximum power density of the passive DEFCs was improved from 5.8 to 11.3 W cm−2 at 30 °C, 13.7 mW cm−2 at 60 °C, and 19.3 mW cm−2 at 90 °C, respectively, in ambient air.

Original languageEnglish
Article number47526
JournalJournal of Applied Polymer Science
DOIs
Publication statusAccepted/In press - 1 Jan 2019

Fingerprint

Direct ethanol fuel cells (DEFC)
Alkaline fuel cells
Electrolytes
Alcohols
Membranes
Graphite
Oxides
Graphene
Fillers
Ethanol
Potassium hydroxide
Ionic conductivity
Charge carriers
Chemical analysis
Field emission
Fourier transform infrared spectroscopy
Ion exchange
Anodes
Polymers
Cathodes

Keywords

  • graphene oxide
  • passive alkaline–direct ethanol fuel cell
  • quaternized polyvinyl alcohol

ASJC Scopus subject areas

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

Cite this

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title = "Performance of quaternized poly(vinyl alcohol)-based electrolyte membrane in passive alkaline DEFCs application: RSM optimization approach",
abstract = "Direct ethanol fuel cells (DEFCs) have emerged as potential tools for producing sustainable energy for portable devices due to their high energy density and their safe and nontoxic fuel source. However, the main problem of DEFCs is the sluggish oxidation of ethanol and fuel crossover from the anode side to the cathode side. Nafion membranes are commonly used as the electrolyte membrane in DEFCs, but they have a high production cost and high ethanol permeability. Thus, this work studies the performance of an alternative electrolyte membrane that is based on a quaternized poly(vinyl alcohol) (QPVA) polymer in passive alkaline DEFCs. The composition of the QPVA-based membranes was optimized with potassium hydroxide (KOH) as an ion charge carrier and by the inorganic filler graphene oxide (GO). The membrane properties were influenced by KOH and GO. The effect of these two parameters on the performance of the QPVA-based membranes was investigated for its ion-exchange capacity and ionic conductivity and selectivity using the response surface methodology to optimize the membrane composition. The QPVA-based membranes were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, and field emission scanning electron microscope. The membrane properties were influenced by KOH concentration doping and GO filler loading, which affect the membrane selectivity and, consequently, the overall performance of the passive alkaline DEFCs. Finally, the maximum power density of the passive DEFCs was improved from 5.8 to 11.3 W cm−2 at 30 °C, 13.7 mW cm−2 at 60 °C, and 19.3 mW cm−2 at 90 °C, respectively, in ambient air.",
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T2 - RSM optimization approach

AU - Zakaria, Z.

AU - Kamarudin, Siti Kartom

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N2 - Direct ethanol fuel cells (DEFCs) have emerged as potential tools for producing sustainable energy for portable devices due to their high energy density and their safe and nontoxic fuel source. However, the main problem of DEFCs is the sluggish oxidation of ethanol and fuel crossover from the anode side to the cathode side. Nafion membranes are commonly used as the electrolyte membrane in DEFCs, but they have a high production cost and high ethanol permeability. Thus, this work studies the performance of an alternative electrolyte membrane that is based on a quaternized poly(vinyl alcohol) (QPVA) polymer in passive alkaline DEFCs. The composition of the QPVA-based membranes was optimized with potassium hydroxide (KOH) as an ion charge carrier and by the inorganic filler graphene oxide (GO). The membrane properties were influenced by KOH and GO. The effect of these two parameters on the performance of the QPVA-based membranes was investigated for its ion-exchange capacity and ionic conductivity and selectivity using the response surface methodology to optimize the membrane composition. The QPVA-based membranes were characterized by Fourier transform infrared spectroscopy, X-ray diffraction, and field emission scanning electron microscope. The membrane properties were influenced by KOH concentration doping and GO filler loading, which affect the membrane selectivity and, consequently, the overall performance of the passive alkaline DEFCs. Finally, the maximum power density of the passive DEFCs was improved from 5.8 to 11.3 W cm−2 at 30 °C, 13.7 mW cm−2 at 60 °C, and 19.3 mW cm−2 at 90 °C, respectively, in ambient air.

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