Development of High-Performance Anode-Supported Planar SOFC with Large Area by 4-Layer Co-Firing Process

Abstract

Solid oxide fuel cell (SOFC) technology has attratced great attention because of higher efficiency, fuel flexibility and eco-friendly stationary power generation system. However, its commercialization is hindered due to the lack of durability and high cost. Herein, a facile and exceptionally reliable 4-layered anode supported SOFCs with a large area (12cm×12cm) was fabricated in a single step co-firing process at 1400 oC, in which tape-casted green films of NiO-YSZ, NiO-1CeScSZ, 1CeSxSZ, and GDC were laminated by isostatic press. The fabrication parameter such as viscosity of the slurries and mechanical strengths of the green films, etc. were optimized. As a result, finely porous anode layer, and highly dense 1CeScSZ electrolyte and GDC buffer layers on a robust porous anode-support were formed successfully. The LSC cathode was screen-printed on the GDC layer. The possibility of mass production of this process are verified through the fabrication of large area cells with an active area 100cm2. The single cell showed high power output of 38 W at total current 50A at 700°C and exhibits low degradation rate of 0.2% kh-1 at 25A for long-term test of 1000 hrs. This facile strategy is time-efficient, reproducible, cost-effective, and highly practical to produce SOFC system satisfying both high-performance and durability.