Electrochemical Study of La_0.31Sr_0.58Ti_0.97Ni_0.03O_3-δ Thin Film and Pt-10Sc1CeSZ Electrodes

In this work thin film SOFC anode MIEC La 0.31 Sr 0.58 Ti 0.97 Ni 0.03 O 3-δ (LSTN) electrodes with embedded 200 nm thick Pt current collectrors (CC-s) and electrodes without CC-s deposited on 10Sc1CeSZ electrolyte were studied in 650 °C in 98.5% H 2 and 1.5 % H 2 O at ambient pressure. Additionally Pt-10Sc1CeSZ electrodes were characterized to determine CC-s own electrochemical activity. It was found that the embedded Pt was the most active part of an LSTN electrode with Pt CC despite the common presumption that covering Pt current collector with dense MIEC layer makes it inactive. Diffusion of H 2 through both LSTN and Pt layers and reaction on the Pt-10Sc1CeSZ interface is proposed. Formation of bubbles under embedded Pt in hydrogen atmosphere was seen and is explained with formation of trapped H 2 O.