Anode contamination cell operating pressure

Fuel cells must carry the costs of conditioning the two reactant gases as well as their own capital charges. Hydrogen requires transport to the anode side of the fuel cells. This is usually by rotary blower, but it also should be possible to operate membrane cells at some positive pressure and then to deliver the hydrogen without mechanical aid. The temperature and water content of the hydrogen must be considered in the overall heat and mass balance. Air and oxygen are candidates for use at the cathodes. The classical balance between cost and efficiency determines the choice. Wth alkaline fuel cells, the carbon dioxide in the air is of concern. It can consume the hydroxide value and contaminate the end product. It is possible to scrub the air to remove the CO2 before... 

Steady-state polarization curves of a fuel cell contaminated by toluene in the air stream. Operating conditions stoichiometry 1.5/3.0 for Hj/air RH 80% cell temperature 80°C back pressure 30 psig. MEA anode/cathode Pt loading 0.4 mg cm". (From Li, H. et al. 2008. /. Power... 

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