Nafion/silicon oxide/phosphotungstic acid nanocomposite membrane with enhanced proton conductivity

Research output: Contribution to journalArticle

91 Citations (Scopus)

Abstract

Nafion-silicon oxide (SiO2)-phosphotungstic acid (PWA) composite membrane has been synthesized to improve Nafion based proton exchange membrane fuel cell (PEMFC) performance. The objective of the study is to fabricate Nafion-SiO2-PWA nanocomposite membrane using sol-gel reaction. The composite is composed of the mixture of Nafion solution, tetra ethoxy orthosilane (TEOS) and PWA solution. The mixed solution was casted at certain temperature until transparent membrane is obtained. Peaks of SiO2 and PWA in the infrared spectra revealed that both inorganic and organic components are present in the modified Nafion based nanocomposite membrane. Analysis with fuel cell test station showed that higher current density was produced by nanocomposite membrane (82 mA cm-2 at 0.6 V for NS15W) than with the Nafion membrane (30 mA cm-2 at 0.2 V) at 90 °C and 40% relative humidity. The internal resistance was seen to increase with the inorganic content. The internal resistances of the commercial Nafion (N112), NS10W, NS15W and NS20W are 6.33, 4.84, 1.33 and 3.6 Ω cm2, respectively and their Tafel constants are 93.4, 84.4, 11.25 and 26.6 mV, respectively. While the nanocomposite membrane results were shown to be better than the commercial Nafion, the overall performances are comparable to those in the open literature.

Original languageEnglish
Pages (from-to)32-40
Number of pages9
JournalJournal of Membrane Science
Volume327
Issue number1-2
DOIs
Publication statusPublished - 5 Feb 2009

Fingerprint

Phosphotungstic Acid
Nanocomposites
Proton conductivity
Silicon oxides
Silicon
silicon oxides
Oxides
Protons
nanocomposites
membranes
Membranes
conductivity
acids
protons
Acids
fuel cells
Composite membranes
Proton exchange membrane fuel cells (PEMFC)
Sol-gels
composite materials

Keywords

  • Nafion
  • Nanocomposite
  • PEMFC
  • Performance
  • Proton exchange membrane

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Science(all)
  • Biochemistry
  • Filtration and Separation

Cite this

Nafion/silicon oxide/phosphotungstic acid nanocomposite membrane with enhanced proton conductivity. / Mahreni, A.; Mohamad, Abu Bakar; Kadhum, Abdul Amir H.; Wan Daud, Wan Ramli; Iyuke, S. E.

In: Journal of Membrane Science, Vol. 327, No. 1-2, 05.02.2009, p. 32-40.

Research output: Contribution to journalArticle

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AB - Nafion-silicon oxide (SiO2)-phosphotungstic acid (PWA) composite membrane has been synthesized to improve Nafion based proton exchange membrane fuel cell (PEMFC) performance. The objective of the study is to fabricate Nafion-SiO2-PWA nanocomposite membrane using sol-gel reaction. The composite is composed of the mixture of Nafion solution, tetra ethoxy orthosilane (TEOS) and PWA solution. The mixed solution was casted at certain temperature until transparent membrane is obtained. Peaks of SiO2 and PWA in the infrared spectra revealed that both inorganic and organic components are present in the modified Nafion based nanocomposite membrane. Analysis with fuel cell test station showed that higher current density was produced by nanocomposite membrane (82 mA cm-2 at 0.6 V for NS15W) than with the Nafion membrane (30 mA cm-2 at 0.2 V) at 90 °C and 40% relative humidity. The internal resistance was seen to increase with the inorganic content. The internal resistances of the commercial Nafion (N112), NS10W, NS15W and NS20W are 6.33, 4.84, 1.33 and 3.6 Ω cm2, respectively and their Tafel constants are 93.4, 84.4, 11.25 and 26.6 mV, respectively. While the nanocomposite membrane results were shown to be better than the commercial Nafion, the overall performances are comparable to those in the open literature.

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