Improved membrane and electrode assemblies for proton exchange membrane fuel cells

Sunny E. Iyuke, Abu Bakar Mohamad, Abdul Amir H. Kadhum, Wan Ramli Wan Daud, Chebbi Rachid

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Three electrodes - E1 (0.18 mg Pt cm-2), E2 (0.38 mg Pt cm-2), E3 (0.4 mg Pt cm-2 without a gas-diffusion layer) - are fabricated and compared with a commercial product (E-TEK). The performance of the electrodes increases with increase in Pt loading in the catalyst layer. The performance of the E2 electrode is superior to that of E1, E-TEK or E3. Elimination of the diffusion layer between the carbon-cloth substrate and the catalyst layer affects the performance of electrode E3 in particular. The power density shows a similar pattern to current density. The difference in performance between E2 and E-TEK electrodes may be due to the difference in the method of fabrication. Increase in exchange current density results in an increase in efficiency. The curves for E1, E2 and E-TEK electrodes appear to stabilize at constant efficiency, which indicates maximum efficiency at a lower exchange current density, compared with the E2 electrode, which does not approach a steady efficiency even at an exchange current density of 1mA cm-2. This means that the E2 electrode has greater efficiency than E1, E3 or E-TEK electrodes. Voltage and irreversibility curves for the four electrodes meet at different voltage operational limits; namely, 0.48, 0.55, 0.46 and 0.42V at 1.2, 0.85, 0.4 and 0.3mA cm-2, for E-TEK, E2, E1 and E3 electrodes, respectively. Hence, while these electrodes can be operated conveniently, the E2 electrode with a 0.38 mg Pt cm-2 loading can be operated at optimum conditions of 0.55 V and 0.85 mA cm-2.

Original languageEnglish
Pages (from-to)195-202
Number of pages8
JournalJournal of Power Sources
Volume114
Issue number2
DOIs
Publication statusPublished - 12 Mar 2003

Fingerprint

Proton exchange membrane fuel cells (PEMFC)
assemblies
fuel cells
membranes
Membranes
Electrodes
electrodes
protons
Current density
current density
catalysts
Catalysts
gaseous diffusion
Diffusion in gases
Electric potential
electric potential
curves
radiant flux density
elimination
Carbon

Keywords

  • Fuel cell
  • Hydrogen
  • Irreversibility
  • Membrane and electrode assembly
  • Optimization
  • Platinum catalyst

ASJC Scopus subject areas

  • Electrochemistry
  • Fuel Technology
  • Materials Chemistry
  • Energy (miscellaneous)

Cite this

Improved membrane and electrode assemblies for proton exchange membrane fuel cells. / Iyuke, Sunny E.; Mohamad, Abu Bakar; Kadhum, Abdul Amir H.; Wan Daud, Wan Ramli; Rachid, Chebbi.

In: Journal of Power Sources, Vol. 114, No. 2, 12.03.2003, p. 195-202.

Research output: Contribution to journalArticle

Iyuke, Sunny E. ; Mohamad, Abu Bakar ; Kadhum, Abdul Amir H. ; Wan Daud, Wan Ramli ; Rachid, Chebbi. / Improved membrane and electrode assemblies for proton exchange membrane fuel cells. In: Journal of Power Sources. 2003 ; Vol. 114, No. 2. pp. 195-202.
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