Fabrication and Electrochemical Testing of Silver Pattern Cathodes for Proton Conducting It-SOFC

Dense silver (Ag) cathodes with different triple phase boundary (TPB; the interface of gas, electrolyte and electrode) length (L TPB ) and electrode area (A ELT ) were fabricated by photolithography and E-beam evaporation over different proton-conducting electrolytes such as BaZr 0.4 Ce 0.4 Y 0.1 Yb 0.1 O 3– δ (BZCYYb4411). A bi-layer lift-off resist method appears more versatile than single layer for successful pattern cathode fabrication. The electrochemical behaviors of Ag pattern cathodes over the BZCYYb4411 electrolyte were tested with counter electrode such as Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3-δ and correlated against geometric features such as L TPB and A ELT to understand the oxygen reduction kinetics and mechanism for proton conducting solid oxide fuel cells. Figure 1