LSCM–(YSZ–CGO) composites as improved symmetrical electrodes for solid oxide fuel cells

✍ Scribed by Juan Carlos Ruiz-Morales; Jesús Canales-Vázquez; Belén Ballesteros-Pérez; Juan Peña-Martínez; David Marrero-López; John T.S. Irvine; Pedro Núñez

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 582 KB
• Volume: 27
• Category: Article
• ISSN: 0955-2219
• DOI: 10.1016/j.jeurceramsoc.2007.02.117

✦ Synopsis

A new concept of solid oxide fuel cell (SOFC), recently proposed, using simultaneously the same material (La 0.75 Sr 0.25 Cr 0.5 Mn 0.5 O 3-δ , LSCM), as both, anode and cathode, has been verified. The performance of such new design, symmetrical fuel cells (SFCs), could be improved by using a YSZ/CGO-based composite. The optimum ratio to minimise the series and the polarisation resistances (R p ) under reducing conductions was 1:1. This composition renders improved R p values by a factor of 2 at 950 • C in flowing H 2 in comparison to LSCM-YSZ composites. Thus, the use of a mixed composite (YSZ-CGO) will allow to extend the applicability of LSCM at temperatures lower than 850 • C. LSCM-(YSZ-CGO) based SFCs offer promising performances, e.g., 0.4 W cm -2 at 950 • C using humidified H 2 as fuel.