Oxygen pore-filling method

Fuel Cells, Non-Precious Metal Catalysts for Oxygen Reduction Reaction, Fig. 4 (a) Polarization curves of several Me-N-C catalysts all examined under the same experimental conditions (1.5 bar H2/O2, 1 mg cm see Ref. [12] et al. for details), (b) today s most active NPMC catalysts (p-Fe-N-C) as prepared by the pore-filling method (PFM) described in Lefevre et al. [44] and by the method described by Proietti et al. [10]. The values... 

Lefevre M, Proietti E, Jaouen F, Dodelet J-P (2009) Iron-based catalysts for oxygen reduction in PEM fuel cells expanded study using the pore-filling method. ECS Trans 25 105-115... 

Yttria stabilized zirconia formed by this reaction fills the air electrode pores. The dynamics of this CVD stage has been modeled by Carolan and Michaels [120], who observed that films produced in this manner penetrate the substrate no more than 2-3 pore diameters from the chloride face of the substrate. It has also been shown that the penetration depth is independent of water concentration. The second step of this method is the EVD step. Once pore closure is achieved, the reactants are not longer in contact. Electrochemical semipermeability related to the existence of small electronic conductivity and large gradient of oxygen partial pressure leads to oxygen transport from the steam side to the chloride side through the deposited electrolyte. The electrochemical reactions involved are ... 

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