YSZ/LSM Composite Cathode Deposited by Solution Precursor Plasma Spraying

Abstract

In this paper, solution precursor plasma spraying (SPPS) was employed to prepare a porous YSZ/LSM composite cathode for solid oxide fuel cell (SOFC). The surface morphology and microstructure of the composite cathode deposits were characterized using SEM. The effect of annealing treatment on SPPS YSZ/LSM microstructure was examined. The results showed that the as-sprayed YSZ/LSM deposits presented a porous aggregate with a size range of 10–60 μm when the alcohol was used as the solvent and the spraying distance was 60 mm. The porous aggregate was found to be composed mainly of small particles ranging from 0.2–2 μm, the YSZ/LSM composite cathode showed a finely porous microstructure with grain sizes from micrometers to sub-micrometers. A further annealing treatment at 1050 °C for 2 h in air resulted in a continuous microstructure porous coating with a perovskite phase. The polarization test results demonstrated that the minimum polarizations were 1.26 and 0.083 Ω·cm2 for the composite cathode at 800 and 1000 °C, respectively.

Recent Advances and Challenges in Thin-Film Fabrication Techniques for Low-Temperature Solid Oxide Fuel Cells

“…Such low ionic conductivities greatly restrict the oxygen reduction reaction to the electrode/electrolyte interface, where the reaction rate is controlled by the oxygen surface exchange [210][211][212]. To expand the TPBs, LSM is commonly mixed with ionic conductors such as YSZ and GDC [213,214]. Thus, despite their good performance at high temperatures, the negligible ionic conductivity of pure LSM materials at low temperatures has made them not suitable for IT-and LT-SOFC applications.…”

Design of Mixed Ionic-Electronic Materials for Permselective Membranes and Solid Oxide Fuel Cells Based on Their Oxygen and Hydrogen Mobility

“…Conventional strontium-doped lanthanum manganite (LSM) materials have poor oxygen mobility ( Figure 18 ), which limits their application as air electrodes in SOFCs with decreased operating temperatures that are being intensively developed [ 69 , 247 , 248 ]. However, they can be successfully used in the composite electrodes in combination with different ionic conductors [ 249 , 250 , 251 ]. Lanthanum ferrite-nickelates (LNF), being predominantly electronic conductors, demonstrate low oxygen diffusion and, as a result, oxygen permeation properties [ 252 , 253 , 254 , 255 ].…”

Design of Mixed Ionic-Electronic Materials for Permselective Membranes and Solid Oxide Fuel Cells Based on Their Oxygen and Hydrogen Mobility

“…Conventional strontium doped lanthanum manganite (LSM) materials have poor oxygen mobility (Figure 9), which limits their application as air electrodes in SOFCs with decreased operating temperatures that are being intensively developed [75,136,137]. However, they can be successfully used in the composite electrodes in combination with different ionic conductors [138][139][140]. Lanthanum ferrite-nickelates (LNF), being predominantly electronic conductors, demonstrate low oxygen diffusion and, as a result, oxygen permeation properties [141][142][143][144].…”