Cathode catalyses loadings

With respect to fuel cell catalysis, most research has been focused on cathode ORR catalysts development, because the ORR kinetics are much slower than flic anodic HOR kinetics in other words, the fuel cell voltage drop polarized by load is due mainly to the cathode ORR overpotential [7, 8]. However, in some cases the overpotential of the anodic HOR can also contribute a non-negligible portion of the overall fuel cell voltage drop [8]. Therefore, the catalytic HOR on the fuel cell anode catalyst is also worth examining. 

Figure 13.6. Durability of Pt/C and Pt Coi. /C-based MEAs tested iu a short stack (active area = 465 cm ) under H2-air at a ceU temperature of 80 °C and total reactant pressures of 150 kPUabs, with both anode and cathode humidities at 100% and anode and cathode reactant stoichiometries of s = 2/2. Data are shown with the stack under a constant load of 0.20 A/cm over 1000 h. Data were averaged over four cells of each type of MEA [1], (Reprinted from Applied Catalysis B Environmental, 56, Gasteiger HA, Kocha SS, Sompalh B, Wagner FT. Activity benchmarks and requirements for Pt, Pt-alloy, and non-Pt oxygen reduction catalysts for PEMFCs, 9-35, 2005, with permission from Elsevier.)...

Ismagilov Z R, Kerzhentsev M A, Shikina N V, Lisitsyn A S, Okhlopkova L B, Barnakov Ch. N, Sakashita M, lijima T and Tadokoro K (2005) Development of active catalysts for low Pt loading cathodes of PEMFC by surface tailoring of nanocarbon materials, Catalysis Today, 102-103, pp. 58-66. 

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