Nafion/Pd-SiO2 nanofiber composite membranes for direct methanol fuel cell applications

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Abstract

One of the major challenges for direct methanol fuel cells is the problem of methanol crossover. With the aim of solving this problem without adverse effects on the membrane conductivity, Nafion/Palladium-silica nanofiber (N/Pd-SiO2) composite membranes with various fiber loadings were prepared by a solution casting method. The silica-supported palladium nanofibers had diameters ranging from 100 nm to 200 nm and were synthesized by a facile electro-spinning method. The thermal properties, ionic exchange capacities, water uptake, proton conductivities, methanol permeabilities, chemical structures, and micro-structural morphologies were determined for the prepared membranes. It was found that the transport properties of the membranes were affected by the fiber loading. All of the composite membranes showed higher water uptake and ion exchange capacities compared to commercial Nafion 117 and proved to be thermally stable for use as proton exchange membranes. The composite membranes with optimum fiber content (3 wt%) showed an improved proton conductivity of 0.1292 S cm-1 and a reduced methanol permeability of 8.36 × 10-7 cm2 s-1. In single cell tests, it was observed that, the maximum power density measured with composite membrane is higher than those of commercial Nafion 117.

Original languageEnglish
Pages (from-to)9474-9483
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume38
Issue number22
DOIs
Publication statusPublished - 26 Jul 2013

Fingerprint

Direct methanol fuel cells (DMFC)
Composite membranes
Nanofibers
fuel cells
methyl alcohol
membranes
Membranes
Ion exchange
Methanol
composite materials
Proton conductivity
Palladium
Fibers
Silica
Transport properties
conductivity
fibers
protons
palladium
Water

Keywords

  • Composite membrane
  • Direct methanol fuel cell
  • Methanol permeability
  • Nanofibers
  • Proton conductivity

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

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title = "Nafion/Pd-SiO2 nanofiber composite membranes for direct methanol fuel cell applications",
abstract = "One of the major challenges for direct methanol fuel cells is the problem of methanol crossover. With the aim of solving this problem without adverse effects on the membrane conductivity, Nafion/Palladium-silica nanofiber (N/Pd-SiO2) composite membranes with various fiber loadings were prepared by a solution casting method. The silica-supported palladium nanofibers had diameters ranging from 100 nm to 200 nm and were synthesized by a facile electro-spinning method. The thermal properties, ionic exchange capacities, water uptake, proton conductivities, methanol permeabilities, chemical structures, and micro-structural morphologies were determined for the prepared membranes. It was found that the transport properties of the membranes were affected by the fiber loading. All of the composite membranes showed higher water uptake and ion exchange capacities compared to commercial Nafion 117 and proved to be thermally stable for use as proton exchange membranes. The composite membranes with optimum fiber content (3 wt{\%}) showed an improved proton conductivity of 0.1292 S cm-1 and a reduced methanol permeability of 8.36 × 10-7 cm2 s-1. In single cell tests, it was observed that, the maximum power density measured with composite membrane is higher than those of commercial Nafion 117.",
keywords = "Composite membrane, Direct methanol fuel cell, Methanol permeability, Nanofibers, Proton conductivity",
author = "Thiam, {H. S.} and {Wan Daud}, {Wan Ramli} and Kamarudin, {Siti Kartom} and Mohamad, {Abu Bakar} and Kadhum, {Abdul Amir H.} and Loh, {Kee Shyuan} and Edy Herianto",
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T1 - Nafion/Pd-SiO2 nanofiber composite membranes for direct methanol fuel cell applications

AU - Thiam, H. S.

AU - Wan Daud, Wan Ramli

AU - Kamarudin, Siti Kartom

AU - Mohamad, Abu Bakar

AU - Kadhum, Abdul Amir H.

AU - Loh, Kee Shyuan

AU - Herianto, Edy

PY - 2013/7/26

Y1 - 2013/7/26

N2 - One of the major challenges for direct methanol fuel cells is the problem of methanol crossover. With the aim of solving this problem without adverse effects on the membrane conductivity, Nafion/Palladium-silica nanofiber (N/Pd-SiO2) composite membranes with various fiber loadings were prepared by a solution casting method. The silica-supported palladium nanofibers had diameters ranging from 100 nm to 200 nm and were synthesized by a facile electro-spinning method. The thermal properties, ionic exchange capacities, water uptake, proton conductivities, methanol permeabilities, chemical structures, and micro-structural morphologies were determined for the prepared membranes. It was found that the transport properties of the membranes were affected by the fiber loading. All of the composite membranes showed higher water uptake and ion exchange capacities compared to commercial Nafion 117 and proved to be thermally stable for use as proton exchange membranes. The composite membranes with optimum fiber content (3 wt%) showed an improved proton conductivity of 0.1292 S cm-1 and a reduced methanol permeability of 8.36 × 10-7 cm2 s-1. In single cell tests, it was observed that, the maximum power density measured with composite membrane is higher than those of commercial Nafion 117.

AB - One of the major challenges for direct methanol fuel cells is the problem of methanol crossover. With the aim of solving this problem without adverse effects on the membrane conductivity, Nafion/Palladium-silica nanofiber (N/Pd-SiO2) composite membranes with various fiber loadings were prepared by a solution casting method. The silica-supported palladium nanofibers had diameters ranging from 100 nm to 200 nm and were synthesized by a facile electro-spinning method. The thermal properties, ionic exchange capacities, water uptake, proton conductivities, methanol permeabilities, chemical structures, and micro-structural morphologies were determined for the prepared membranes. It was found that the transport properties of the membranes were affected by the fiber loading. All of the composite membranes showed higher water uptake and ion exchange capacities compared to commercial Nafion 117 and proved to be thermally stable for use as proton exchange membranes. The composite membranes with optimum fiber content (3 wt%) showed an improved proton conductivity of 0.1292 S cm-1 and a reduced methanol permeability of 8.36 × 10-7 cm2 s-1. In single cell tests, it was observed that, the maximum power density measured with composite membrane is higher than those of commercial Nafion 117.

KW - Composite membrane

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KW - Proton conductivity

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