A Novel Cobalt-free La0.6Sr0.4Fe0.9Nb0.1O3 Cathode for Medium Temperature Solid Oxide Fuel Cells

Abstract

A novel cobalt-free La0.6Sr0.4Fe0.9Nb0.1O3 (LSFNb) cathode material was synthesized by a solid-state reaction. And BaCe0.7Zr0.2Sm0.1O3-α (BCZSm) electrolyte was prepared by a sol-gel method. Transmission Electron Microscopy (TEM) and Thermal Gravimetry Analysis-Differential Scanning Calorimetry (TGA-DSC) were used to determine the size and the first sintering temperature of BCZSm, respectively. The structures of cathode, electrolyte and anode were analyzed via X-ray Diffraction (XRD). A thin film fuel cell of LSFNb / BCZSm / NiO-BCZSm was assembled and reached the highest power densities of 109 mW•cm-2 and 182.6 mW•cm-2 at 700 °C and 800 °C, respectively.