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 attracted 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°C, in which tape-casted green films of NiO-YSZ, NiO-1CeScSZ, 1CeScSZ, and GDC were laminated by isostatic press. The fabrication parameter, such as viscosity of the slurries and mechanical strengths of the green films, 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 possibility of mass production is verified through the fabrication of large area cells with an active area 100 cm2. The single cell showed high-power output of 28 W at total current 50 A at 700°C and exhibits low degradation rate of 0.2%/kh 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.