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Research Papers

High Temperature Direct Methanol Fuel Cell Based on Phosphoric Acid PBI Membrane

[+] Author and Article Information
M. Mamlouk1

School of Chemical Engineering and Advanced Materials, Merz Court,  University of Newcastle, Newcastle upon Tyne NE1 7RU, United KingdomMohamed.mamlouk@ncl.ac.uk

K. Scott, N. Hidayati

School of Chemical Engineering and Advanced Materials, Merz Court,  University of Newcastle, Newcastle upon Tyne NE1 7RU, United Kingdom

1

Corresponding author.

J. Fuel Cell Sci. Technol 8(6), 061009 (Sep 26, 2011) (8 pages) doi:10.1115/1.4004557 History: Received January 20, 2011; Revised June 30, 2011; Published September 26, 2011; Online September 26, 2011

A study of a vapor feed DMFC using PBI loaded with phosphoric acid is reported. The anode catalyst was a Pt-Ru alloy and the cathode Pt, both supported on carbon black. Performance of the fuel cell with low methanol concentrations is reported and in situ measurements of anode and cathode potentials were used to diagnose the fuel cell performance. The influence of temperature, methanol feed concentration, and oxygen pressure are reported. The fuel cell performance was quite low with peak power densities of 12 to 16 mW cm−2 obtained at a temperature of 175 °C, although open circuit potentials of up to 800 mV were achieved. The poor performance was attributed to significant anode polarization due to the presence of phosphate in the catalyst layer and to the influence of methanol crossover on the cathode performance. The performance of the DMFC was found to fall steadily with time over seven days of operation which was associated with an increased cell resistance as measured by ac impedance.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

HT-DMFC operating at temperatures of 120, 150, and 175 °C with oxygen and air with loadings of 1/0.5 mg · cm−2 Pt-Ru/Pt for anode/cathode, respectively (2% vol methanol)

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Figure 2

HT-DMFC operating at temperatures of 120, 150, and 175 °C with oxygen and air with loadings of 1/0.5 mg · cm−2 Pt-Ru/Pt for anode/cathode (4% vol methanol)

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Figure 3

Anode performance for methanol oxidation operating at temperatures of 120, 150, and 175 °C using 2% vol MeOH and a loading of 1 mg · cm−2 Pt-Ru for anode

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Figure 4

Methanol oxidation at a temperature of 20 °C using 0.5 M sulfuric and 0.5 M phosphoric acids, the catalyst loading was 0.02 mg cm−2 Pt-Ru (1.0 M methanol and Nafion as a binder)

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Figure 5

(a) Methanol oxidation at different temperatures using 0.5 M phosphoric acids, the catalyst loading was 0.02 mg · cm−2 Pt-Ru and 20% wt PBI (1.0 M methanol). (b) Tafel plots of methanol oxidation at different temperatures using 0.5 M phosphoric acids, the catalyst loading was 0.02 mg · cm−2 Pt-Ru and 20%wt PBI (1.0 M methanol).

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Figure 6

Arrhenius plot for 1 M methanol oxidation at different temperatures using 0.5 M phosphoric acids, the catalyst loading was 0.02 mg · cm−2 Pt-Ru and 20% wt PBI

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Figure 7

Methanol oxidation comparison between PBI and Nafion as binder at different temperatures using 0.5 M phosphoric acids, catalyst loading was 0.02 mg · cm−2 Pt-Ru (1.0 M methanol)

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Figure 8

(a) Cathode performances for oxygen reduction operating at different temperatures using air with loading of 0.5 mg cm−2 Pt (2% vol methanol, H2: with hydrogen feed at the anode). (b) Cathode performances for oxygen reduction operating at different temperatures using oxygen with loading of 0.5 mg cm−2 Pt (2% vol methanol, H2: with hydrogen feed at the anode).

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Figure 9

HT-DMFC operating with oxygen and air using 30% and 50% Pt/C on the cathode, the catalyst loadings was 1/0.5 mg · cm−2 Pt-Ru/Pt for anode/cathode

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Figure 10

effect of operating time on cell performance for methanol oxidation operating at temperature of 120 °C using 2% vol MeOH and a loading of 1 mg · cm−2 Pt-Ru for anode

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Figure 11

Anode performances for methanol oxidation operating at temperature of 120 °C using 2% vol MeOH and a loading of 1 mg · cm−2 Pt-Ru for anode over a week of operation

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