High-performance (La,Sr)(Cr,Mn)O3/(Gd,Ce)O2−δ composite anode for direct oxidation of methane

Performance and carbon deposition over Pd nanoparticle catalyst promoted Ni/GDC anode of SOFCs in methane, methanol and ethanol fuels

“…5 is the electrode polarization resistance of high and low frequency arcs (R H and R L ) as a function of dc bias for the oxidation reaction in hydrogen and methanol on a 0.11 mg cm À2 Pd-infiltrated Ni/GDC anode at 850 C. Both R H and R L decrease with the increase of the dc bias, indicating that applied dc bias enhances the electrode reactions associated with high and low frequency arcs. Chen et al [40] studied the impedance behavior of an LSCM/GDC anode in wet methane as a function of dc bias at 850 C. They reported that by applying dc bias of 50, 100, 200 and 300 mV during impedance measurement only low frequency part of the arc is affected and the high frequency part is independent of the applied dc bias. In the case of Ni/YSZ cermet anodes, R H decreases with the increase dc bias while the R L is essentially independent of the dc bias for the hydrogen oxidation reaction [41].…”

Solid Oxide Fuel Cell Anode Materials for Direct Hydrocarbon Utilization

“…[ 251 ] R p approached 0.5 Ω cm 2 in H 2 and 0.8 Ω cm 2 in wet CH 4 at 900 ° C. [ 265 ] P max of (La 0.75 Sr 0.25 ) 0.9 Cr 0.5 Mn 0.5 O 3 anodes fed with wet CH 4 was 0.2 W cm − 2 at 0.5 V at 900 ° C. [ 266 ] In a separate study, R p of LSCM anode was reported to be 2-3 Ω cm 2 in wet CH 4 at 850 ° C. [ 267 ] The anode performance was improved by impregnating electrocatalyst particles into LSCM anodes. R p of GDC-impregnated LSCM [ 268 ] and LSCM-GDC [ 269 ] composite electrodes was around 0.12-0.15 and 0.44-0.50 Ω cm 2 in wet H 2 and wet CH 4 , respectively. LSCM decomposed into MnS, La 2 O 2 S, and MnOS phases when operated in 0.5% H 2 S-CH 4 for 120 h. [ 270 ] A LSM-supported SOFC single cell with LSCM anode achieved P max of 0.18-0.82 and 0.06-0.35 W cm 2 in wet H 2 and CH 4 , respectively.…”

On the Development of an Electrochemical Sensor to Measure SOFC Fuel Gas Compositions

“…LSCM, from a combined citrate and EDTA complexing method (9), and GDC (NexTech, USA) powders were mixed with polyethylene glycol to form a slurry. The slurry was then painted on YSZ electrolyte and sintered at 1000°C for 2 h in air.…”

“…The electrode was chosen because of its stability under both oxidizing and reducing conditions and lower propensity to coking than Ni or Ni/YSZ electrode. Compared to LSCM/YSZ composite, LSCM/GDC also provides higher reforming activity (9). To further enhance conductivity, precious metals (Pd, Rh or Ru) were added to the composite electrode by wet impregnation.…”