Proton exchange membrane fuel cells vulcan

Figure 23.8. Effect of CO contamination time on fuel cell performance in H2/IOO ppm CO during the poisoning period anode and cathode Pt on Vulcan XC72 T = 80 °C P(h2) = 0.22 MPa, P(02) = 0.24 MPa [51]. (Reprinted by permission of ECS— The Electrochemical Society, from Oetjen H-F, Schmidt VM, Stimming U, Trila F. Performance data of a proton exchange membrane fuel cell using H2/CO as fuel gas.)...

Figure 23.23. Platinum surface area of the cathode with TKK 46 wt% Pt/Vulcan catalyst over 10,000 potential cycles at 20 mV/s in the voltage range 0.6-1.0 V at 80 °C under humidified H2-N2 (anode-cathode) [33]. (Reprinted by permission of ECS— The Electrochemical Society, from Ferreira PJ, la O GJ, Shao-Hom Y, Morgan D, Makharia R, Kocha S, Gasteiger HA. Instability of PEC electrocatalysts in proton exchange membrane fuel cells.)...

There is only one example in the literature of polyphosphazene performance in a proton-exchange membrane (PEM) hydrogen fuel ceU. Allcock and Lvov [45] tested a sulfonimide polyphosphazene membrane in a hy-drogen/oxygen fuel cell at room temperature and at 80 °C. The membrane-electrode-assembly (MEA) was fabricated from a 100 xm thick sulfonimide polyphosphazene membrane that was crosslinked with y-radiation (40 MRad). The polymer lEC was 0.99 mmol/g, with an equilibrium water swelling of 42%, and a proton conductivity of 0.058 S/cm. The anode and cathode were prepared from carbon-supported platinum (20% Pt on Vulcan XC-72R) at a Pt loading of 0.33 mg/cm. The electrodes were hot pressed onto the membrane at 65 °C and 400 psi for 30 s. As a reference, a Nafion 117 MEA was also prepared with the same electrode catalyst at a loading of 0.26 mg/cm for the anode and 0.48 mg/cm for the cathode. For Nafion, the electrodes were hot pressed at 125 °C and 1400 psi for 2 min. 

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