Micro-tubular solid oxide fuel cells with graded anodes fabricated with a phase inversion method

✍ Scribed by Ling Zhao; Xiaozhen Zhang; Beibei He; Beibei Liu; Changrong Xia

• Publisher: Elsevier Science
• Year: 2011
• Tongue: English
• Weight: 900 KB
• Volume: 196
• Category: Article
• ISSN: 0378-7753
• DOI: 10.1016/j.jpowsour.2010.08.074

✦ Synopsis

Micro-tubular proton-conducting solid oxide fuel cells (SOFCs) are developed with thin film BaZr 0.1 Ce 0.7 Y 0.1 Yb 0.1 O 3-ı (BZCYYb) electrolytes supported on Ni-BZCYYb anodes. The substrates, NiO-BZCYYb hollow fibers, are prepared by an immersion induced phase inversion technique. The resulted fibers have a special asymmetrical structure consisting of a sponge-like layer and a finger-like porous layer, which is propitious to serving as the anode supports for micro-tubular SOFCs. The fibers are characterized in terms of porosity, mechanical strength, and electrical conductivity regarding their sintering temperatures. To make a single cell, a dense BZCYYb electrolyte membrane about 20 m thick is deposited on the hollow fiber by a suspension-coating process and a porous Sm 0.5 Sr 0.5 CoO 3 (SSC)-BZCYYb cathode is subsequently fabricated by a slurry coating technique. The micro-tubular proton-conducting SOFC generates a peak power density of 254 mW cm -2 at 650 • C when humidified hydrogen is used as the fuel and ambient air as the oxidant.