Manganese Doped Lanthanum-Strontium Chromite Fuel Electrode for Solid Oxide Fuel Cell and Oxygen Transport Membrane Systems

摘要

(La_(0.75)Sr_(0.25))_(0.95)Cr_(0.7)Mn_(0.3)O_3 (LSCM) mixed with 8YSZ has promising attributes to function as fuel electrode and electrolyte membrane in high temperature electrochemical devices including solid oxide fuel cell as well as oxygen transport membrane systems. In this study, electrochemical performance of the symmetrical cells of the configuration LSCM/8YSZ//8YSZ//LSCM/8YSZ is investigated under simulating device operating conditions. Role of temperature (850- 950°C) and bias (0-0.8V) is evaluated on the electrochemical impedance of the symmetrical cells in oxidizing (air) and reducing atmosphere (Ar-3%H_2-3%H_2O). Higher performance is obtained in oxidizing when compared to reducing atmosphere. Bulk, surface and the electrode/electrolyte interfaces are examined during posttest characterization of the tested cells. No electrode delamination as well as no interface layer or compound formation is identified in the bulk and/or interface in both oxidizing and reducing atmosphere.