A 5 x 5 cm(2) protonic ceramic fuel cell with a power density of 1.3 W cm(-2) at 600 degrees C

Abstract

In spite of various advantages of protonic ceramic fuel cells over conventional fuel cells, distinct scepticism currently remains about their applicability because of lower-than-predicted performance and difficulty with scale-up. These challenges mainly stem from the refractory nature of proton-conducting ceramic electrolytes and the low chemical stability of these materials during the sintering process. Here, we present the fabrication of a physically thin, structurally dense and chemically homogeneous electrolyte, BaCe0.55Zr0.3Y0.15O3-delta (BCZY3), through a facile anode-assisted densification of the electrolyte on a structurally and compositionally uniform anode support, which resulted in breakthroughs in performance and scalability. A BCZY3-based protonic ceramic fuel cell with a size of 5 x 5 cm(2) exhibits an area-specific ohmic resistance of 0.09 Omega cm(2) and delivers a power as high as 20.8W per single cell at 600 degrees C.