Nanotubes of rare earth cobalt oxides for cathodes of intermediate-temperature solid oxide fuel cells

Electrochemical performance of Nd1.93Sr0.07CuO4 nanofiber as cathode material for SOFC

“…A Pt wire was used as reference electrode (RE) and painted on the same side that of the working electrode. The cathodes were first heated at 400 C for 2 h to eliminate organic binders, followed by sintering at 1000 C for 15 min in air, according to the modified "fast firing" method [28], to get good attachment with CGO electrolyte, and at the same time to retain the fiber morphology of cathode material. For comparison, Nd 1.93 Sr 0.07 CuO 4 powder was prepared by solid state reaction method.…”

“…In the case of SOFCs, nanotube material La 0.6 Sr 0.4 CoO 3 has been used to obtain highly porous cathode layers with large areas exposed to the surrounding environment [23]. Further study indicated that the cathode performance was improved when the diameter of nanotube was sufficiently small to become dense nanorods after cathode sintering [28]. With this in mind, we propose nanofiber be a good candidate to explore for such application.…”

Nanostructured LnBaCo2O6−𝜹 (Ln = Sm, Gd) with layered structure for intermediate temperature solid oxide fuel cell cathodes

“…13,14 We show micrographs corresponding to GbBaCo 2 O 6 because both cathodes display similar characteristics, a complete set of pictures of the cathodes can be found on the supplementary material. The BET specific surface area of the precursors (previous to the deposition of the cathode) was 48 and 56 m 2 /g for GBCO2 and SBCO2 respectively, while for GBCO8 and SBCO8 we obtained values around 40 m 2 /g.…”

“…Thus, the growth of the particles is constrained and also the as prepared power is highly dissaglomerated. 13,14 All cathodes display very low ASR in the IT range, as compared with cathodes of similar compositions, 23 moreover taking into account that they were simply smeared with a brush for deposition. Our results show that cathodes prepared using templates of smaller diameter display an enhanced performance.…”

“…[10][11][12] In the case of the cathode, we developed nanostructured tubes and rods that show impressively low polarization resistance. [13][14][15][16] Typical SOFC cathodes are made mixed ionic and electronic conductors (MIEC). 17 Among them, layered MIEC perovskites of formula LnBaCo 2 O 6-δ (LnBCO, Ln = lanthanide) [18][19][20] have shown to display fast oxide-ion diffusion due to a reduction of the oxygen bonding strength that leads to the appearance of channels for fast ion motion.…”