Solid electrolyte membrane reactor is a type of an electrochemical reactor which utilizes a solid electrolyte (an ion-conducting membrane) as an ion-conducting medium and a separator (Sundmacher et al. 2005). These reactors found an application in electrochemical processing. Examples are fuel cells, batteries, and electrolyzers. Electrochemical oxidation and reduction reactions in solid electrolyte membrane reactortake place in porous electrodes which are usually directly applied on different sides of the solid electrolyte. These electrodes are complex composite structures which have to fulfill different requirements. They should possess catalytic activity such that electrochemical reactions can take place; they should be able to conduct electrons and ions which are released or consumed in electrochemical reactions, and they should transport non-charged reactants or products of reactions to or away from the reaction site. In practice it is difficult to satisfy all these requirements....