A Solid Oxide Fuel Cell with Lanthanum and Calcium Co-Doped Strontium Titanate as Support

Abstract

Alternative anodes are of great interest for robust solid oxide fuel cells (SOFCs). A-site deficient strontium titanate co-doped with lanthanum and calcium, La0.2Sr0.25Ca0.45TiO3 (LSCTA-), has been investigated as a potential anode for SOFCs. Flat multilayer ceramics have been produced by controlling the sintering behavior of LSCTA-, resulting in a 450 µm thick porous LSCTA- scaffold with a well adhered 40 µm dense YSZ electrolyte. Impregnation of CeO2 and Ni has resulted in power densities of 0.96 Wcm-2 at 800 oC, higher than 0.125 Wcm-2 without impregnation and 0.38 Wcm-2 for Ni alone, demonstrating encouraging performance. Work continues to improve understanding of catalyst-scaffold interactions and scaling up the concept.

Scaling up aqueous processing of A-site deficient strontium titanate for SOFC anode supports

“…As Figure 3a and b show, despite comparable d50 values at identical calcination conditions, powder B yields a narrower particle size distribution than powder A. As a previous study has shown, LSCTA-is a highly sinteractive material, owing to its A-site deficiency and calcium content [6]. The effect of Asite deficiency on sinterability is evident from Figure 3b, showing a smaller fine fraction for powder B, owing to its higher A-site deficiency as compared to powder A.…”

“…The A-site deficient La0.20Sr0.25Ca0.45TiO3 (LSCTA-) shows reasonable mechanical strength [5] and may therefore also be suitable as anode support material in an anode supported cell (ASC) design, allowing for SOFC operation at lower temperatures. To this end, an aqueous tape casting process was developed, as an environmentally friendly alternative to the organics based process [6,7]. Also, the aqueous processing allows for using a wider range of polymeric pore formers that would otherwise dissolve in the solvent.…”

La and Ca-Doped A-Site Deficient Strontium Titanates Anode for Electrolyte Supported Direct Methane Solid Oxide Fuel Cell

“…The polarization resistance in the present study is 0.20 ohm cm 2 , which is much lower than the reported value 1.86 ohm cm 2 . 22,26 It can be inferred from above mentioned analyses that LSCT A-is catalytically not very active for methane decomposition but it does not promote the coke deposition during operation as evident from the stable performance after dry CH 4 exposure for 3 h. The low CH 4 fuel utilization i.e. 2% in case of complete oxidation and 8% in case of partial oxidation at 800 • C in SOFC test condition is observed.…”

“…CeO 2 and/or Ni catalyst were impregnated in LSCT A-porous anode matrix using Ce(NO 3 ) 3 .6H 2 O and Ni(NO 3 ) 2 .6H 2 O solution. 22 Multiple impregnation and calcination at 500 • C were carried out to get appropriate loading. Silver wires, used as current collectors, were connected to both the electrodes using silver paste.…”

Synthesis and properties of La0.05Ba0.95Ti1−M O3 (M = Mn, Ce) as anode materials for solid oxide fuel cells

“…Thus, to improve the catalytic and electrochemical power of lanthanum strontium titanates, several studies focused on the impregnation of ceramic networks, and small quantities of very active nanoparticles, e.g., Ni, CeO 2 or Ru, can be added to the electrode. Such material is generally obtained by impregnation of a pre-sintered conducting electrode with a metallic salt or a nanopowder suspension [20][21][22][23][24][25].…”