Microstructure Characterization of Nafion®g HP JP as a Proton Exchange Membrane for Fuel Cell: Positron Annihilation Study

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

Abstracts

EN

Free volume size V_{f} and proton conductivity σ of a novel polymer electrolyte membrane were investigated as a function of temperature and relative humidity up to 140°C and 80%, respectively. The free volume size V_{f} for Nafion® HP JP reflect the α-transition temperature at about 98°C. In addition the free volume size V_{f} for Nafion® HP JP is smaller than that for Nafion® NRE212 membrane which leads to lower methanol permeability of the former membrane. The proton conductivity σ for Nafion® HP JP decreases with increase of temperature up to transition temperature due to free and bound water loss, then it starts to increase due to dynamic segmental motion. It increases for Nafion® HP JP with the increase of the relative humidity. A good correlation between V_{f} and σ was successfully established for both membranes which indicates that σ is governed by the free volume. In conclusion, Nafion® HP JP is a suitable membrane for a proton exchange membrane fuel cell application.

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: 1543-1547

Dates

published

2017-11

Contributors

author

Hamdy 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

author

M. Said

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

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Identifiers

DOI

10.12693/APhysPolA.132.1543