Proton Conductivity and Free Volume Properties in Per-Fluorinated Sulfonic acid/PTFE Copolymer for Fuel Cell

• Authors: H. Mohamed , E. Abdel-Hady , M. Abdel-Hamed
• Languages of publication: EN

Abstracts

EN

The proton conductivity mechanism in per-fluorinated sulfonic acid/PTFE copolymer Fumapem® membranes for polymer electrolyte membranes has been investigated. Three samples of Fumapem® F-950, F-1050 and F-14100 membranes with different ion exchange capacity 1.05, 0.95, and 0.71 meq/g, respectively, were used in this study after drying. The o-Ps hole volume size (V_{FV,Ps}) was quantified using the positron annihilation lifetime technique while the proton conductivities (σ ) were measured using LCR Bridge as function of temperature. It was found that as the ion exchange capacity increases, the proton conductivity increases and the free volume expands. Temperature dependences of proton conductivity and the o-Ps hole volume size (V_{FV,Ps}) reflect the glass transition temperature of the membrane. A good linear correlation between the reciprocal of the o-Ps hole volume size (1/V_{FV,Ps}) and log(σ)+Δ E_a/2.303k_{B}T, (where ΔE_a is the activation energy, T is the absolute temperature and k_{B} is the Boltzmann constant) at different temperatures indicate that the ionic motion in dry Fumapem® is governed by the free volume. A linear relationship between the critical hole size γ V*_{i} and the ion exchange capacity was also achieved.

Keywords

EN

78.70.Bj; 82.47.Nj; 72.80.Le; 36.10.Dr; 88.30.J-; 88.30.pf

Discipline

• 88.30.J-: Fuel cell components
• 82.47.Nj: Polymer-electrolyte fuel cells (PEFC)
• 88.30.pf: Direct methanol fuel cells
• 72.80.Le: Polymers; organic compounds (including organic semiconductors)
• 78.70.Bj: Positron annihilation(for positron states, see 71.60.+z in electronic structure of bulk materials; for positronium chemistry, see 82.30.Gg in physical chemistry and chemical physics)
• 36.10.Dr: Positronium(see also 82.30.Gg Positronium chemistry)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2017
• Volume: 132
• Issue: 5
• Pages: 1509-1514

Dates

published

2017-11

Contributors

author

H. Mohamed

• Physics Department, Faculty of Science, Minia University, P.O. Box 61519 Minia, Egypt
• Renewable Energy Science & Engineering Department, Faculty of Postgraduate Studies for Advanced Science (PSAS), Beni-Suef University, P.O. Box 62511 Beni-Suef, Egypt

author

E. Abdel-Hady

• Physics Department, Faculty of Science, Minia University, P.O. Box 61519 Minia, Egypt

author

M. Abdel-Hamed

• Physics Department, Faculty of Science, Minia University, P.O. Box 61519 Minia, Egypt

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Identifiers

DOI

10.12693/APhysPolA.132.1509