GdBaCo2O5+x layered perovskite as an intermediate temperature solid oxide fuel cell cathode

Abstract

GdBaCo 2 O 5+x (GBCO) was evaluated as a cathode for intermediate-temperature solid oxide fuel cells. A porous layer of GBCO was deposited on an anode-supported fuel cell consisting of a 15 m thick electrolyte of yttria-stabilized zirconia (YSZ) prepared by dense screen-printing and a Ni-YSZ cermet as an anode (Ni-YSZ/YSZ/GBCO). Values of power density of 150 mW cm −2 at 700 • C and ca. 250 mW cm −2 at 800 • C are reported for this standard configuration using 5% of H 2 in nitrogen as fuel. An intermediate porous layer of YSZ was introduced between the electrolyte and the cathode improving the performance of the cell. Values for power density of 300 mW cm −2 at 700 • C and ca. 500 mW cm −2 at 800• C in this configuration were achieved.

Investigation of GdBaCo 2−x Fe x O 6−δ ( x = 0, 0.2) – Ce 0.8 Sm 0.2 O 2 composite cathodes for intermediate temperature solid oxide fuel cells

“…For example, the maximum conductivity value for GdBaCo 2 O 6Àd was found [3] to be equal to 620 S$cm À1 as against 400 S$cm À1 according to Ref. [11].…”

Nano-structured composite cathodes for intermediate-temperature solid oxide fuel cells via an infiltration/impregnation technique

“…In the MIEC cathode, the cathode reaction takes in the entire surface of the MIEC cathode material, not just confined to the TPBs formed by LSM, electrolyte, and pores as in the LSM cathode [10]. These MIEC oxides, including (La,Sr)CoO 3 ·(LSC) [11][12][13], (La,Sr)(Co,Fe)O 3 ·(LSCF) [14,15], (Sm,Sr)Co 3 ·(SSC) [16][17][18][19], (Ba,Sr)(Co,Fe)O 3 ·(BSCF) [20], and GdBaCoO 5 + ␦ [21,22] have been demonstrated very high electrochemical performance. Besides Cocontaining MIECs which have received considerable attention, a few other new cathode materials have been developed, including pyrochlore oxides [23][24][25][26][27], Ruddlesden-Popper type oxides [28][29][30][31][32][33][34], LaNi 1 − x Fe x O 3 ·(LNF) based oxides [35,36].…”

Novel K2NiF4‐Type Materials for Solid Oxide Fuel Cells: Compatibility with Electrolytes in the Intermediate Temperature Range

“…Building on this there has also been growing interest in related layered structures such as the double perovskites [21][22][23]. Tarancon et al [22,23] O (99.99%, Aldrich) combined with citric acid and polyethylene glycol (PEG) was used. The mixed nitrates were heated with citric acid and PEG until gelation occurred and were then dehydrated and calcined to obtain the final products.…”