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

Abstract

Nickel-yttria stabilized zirconia (Ni-YSZ) cermet anodes for solid oxide fuel cells (SOFC) possesses excellent catalytic properties and stability for H2 oxidation but not for hydrocarbons as it results in fast carbon deposition in absence of excess steam. In the present work, A-site deficient porous LSCTA-(La0.2Sr0.25Ca0.45TiO3) anode has been fabricated using the environment friendly, aqueous tape casting method followed by the same procedure for the The morphology of the anode before and after cell testing has been analyzed using scanning electron microscope followed by X-ray diffraction studies to understand phase changes during fabrication and testing.

Tailoring SOFC Electrode Microstructures for Improved Performance

“…[111,[126][127][128][129] With impregnated ceria (6-10 wt%) and Ni (3-5 wt%), a dramatic enhancement in anode performance was obtained compared to that of the bare LSCT A− backbone and the backbone with ceria only. [111,[126][127][128][129] With impregnated ceria (6-10 wt%) and Ni (3-5 wt%), a dramatic enhancement in anode performance was obtained compared to that of the bare LSCT A− backbone and the backbone with ceria only.…”

“…Irvine et al. have carried out extensive studies on infiltration into the A‐site deficient La 0.2 Sr 0.25 Ca 0.45 TiO 3 (LSCT A− ) anode SOFC, testing with H 2 as well as CH 4 . With impregnated ceria (6–10 wt%) and Ni (3–5 wt%), a dramatic enhancement in anode performance was obtained compared to that of the bare LSCT A− backbone and the backbone with ceria only .…”

Enhanced coking resistance of Ni cermet anodes for solid oxide fuel cells based on methane on‐cell reforming by a redox‐stable double‐perovskite Sr 2 MoFeO 6‐δ

“…For this purpose, the first step is to improve the anode of SOFC which is not only catalytically active for breaking the C―H bond with subsequent release of syngas, but also be electron conductive. In recent years, oxygen‐deficient and mixed‐valent perovskite materials have been shown to have a potential application as SOFC anode materials because of their appropriate catalytic activity and electro‐conductivity. For example, molybdenum‐based double perovskites Sr 2 MMoO 6‐δ (M = Co, Ni, Fe, Mn, and Mg) have exhibited excellent catalytic activity towards the electro‐oxidation of H 2 and CH 4 .…”

Upscaling of Co‐Impregnated La0.20Sr0.25Ca0.45TiO3 Anodes for Solid Oxide Fuel Cells: A Progress Report on a Decade of Academic‐Industrial Collaboration

“…Though the electrocatalytic activity of LSCT A− toward direct methane oxidation was low, it did not promote coking during this operational period. [55] Addition of 6 wt% CeO 2 appeared to improve performance, giving a maximum power density of 194 mW cm −2 in a H 2 fuel gas. However, despite the fact that coimpregnation of 6 wt% CeO 2 and 4 wt% Ni (similar to the catalyst system employed by Verbraeken et al) gave an improved maximum power density of 328 mW cm −2 in the same fuel, upon switching to "dry" methane, a maximum power density of only 250 mW cm −2 was achieved, which rapidly degraded to 165 mW cm −2 after only 3 h, implying the Ni catalyst phase was encouraging coke formation.…”

“…However, despite the fact that coimpregnation of 6 wt% CeO 2 and 4 wt% Ni (similar to the catalyst system employed by Verbraeken et al) gave an improved maximum power density of 328 mW cm −2 in the same fuel, upon switching to "dry" methane, a maximum power density of only 250 mW cm −2 was achieved, which rapidly degraded to 165 mW cm −2 after only 3 h, implying the Ni catalyst phase was encouraging coke formation. [55] Although operation in "dry" methane is not relevant to the system requirements of HEXIS, [3][4][5] this research provided an indicator that alternative catalysts to Ni may need to be sought in order to reduce or prevent coking and/or sulfur poisoning in unprocessed natural gas feeds for next-generation anodes.…”