Development of layered anode structures supported over Apatite-type Solid Electrolytes

¹ Laboratory of Chemistry & Materials Technology, School of Technological Applications, TEISTE, 34400, Psachna, Greece
² Tomsk State University, Tomsk, 634050, Russia
³ Boreskov Institute of Catalysis, Novosibirsk State University, Novosibirsk, 630090, Russia

^a Corresponding author: vasta@teihal.gr

Abstract

Apatite-type lanthanum silicates (ATLS) materials have attracted interest in recent literature as solid electrolytes for SOFCs. The fabrication of an ATLS based fuel cell with the state-of-art electrodes (NiO/YSZ as anode and LSCF or LSM as cathode) can show degradation after long operation hours due to Si diffusion mainly towards the anode. In this work, we report a “layer-by-layer anodic electrodes” fabrication by means of spin coating and physical spraying. The overall aim of this work is the successful fabrication of such a layered structure including suitable blocking layers towards the inhibition of Si interdiffusion from the apatite electrolyte to the anode. The results showed that the deposition of 3 layers of LFSO/GDC (3μm), NiO/GDC (4μm) and the final NiO/YSZ anode layer provided a stable half-cell, with no solid state reaction occurring among the electrodes and no Si diffusion observed towards the anode after thermal treatment at 800°C for 120h.