Recent Progress in Anode Materials for Solid Oxide Fuel Cells

Abstract

In this paper, we report our recent progress in the development of anode materials for intermediate temperature solid oxide fuel cells (IT-SOFCs). Mo-doped Ce1-xMoxO2+δ (x = 0.05, 0.07, 0.1, 0.13) (CMO), Mo + RE-co-doped Ce0.9-xRExMo0.1O2.1-0.5x (x = 0.2, 0.3) (RE = Y, Sm, Gd) (CRMO) and Nd2WO6-type Sm2-xAxM1-yByO6-δ (A = Ca, Sr; M = Mo, W; B = Ce, Ni) have been investigated in our laboratory. For CMO and CRMO, the formation of fluorite-like structure was confirmed by powder X-ray diffraction (PXRD) and the change in the lattice constant was found to be consistent with the Shannon ionic radius trend. CRMO samples treated under dry H2 at elevated temperatures were found to retain the original fluorite structure while CMO showed presence of Mo in the PXRD. Sm2-xAxMoO6-δ (A = Ca, Sr) after heating under 97% H2 +3% H2O up to 850 oC changed from Nd2WO6-type structure into Sm2MoO5 due to the reduction of MoVI that was confirmed by PXRD.