Redox behaviour, chemical compatibility and electrochemical performance of Sr2MgMoO6−δ as SOFC anode

Electrical conductivity of Sr₂MgMoO_{6−δ} for solid oxide fuel cell anodes

“…Conductivity as a function of activation energy values for total conduction at 800°C in reducing atmospheres. Values obtained in this study are compared to those published in the literature by Huang et al, 34) Kong et al, 54) Marrero-López et al, 38), 55) and Xie et al 56) …”

“…2) and was small as the value of the high density sintered body suitable for conductivity measurement. Although it is difficult to declare it because the particle size of the sample used were 33) disc/5% H 2 /Ar 0.084 0.197 Huang et al 34) electrode film/air 0.197 Kong et al 54) disc/air 0.0683 0.222 Marrero-López et al 55) electrode film/air 0.270 1.43 Marrero-López et al 38) disc/5% H 2 /Ar 0.195 Marrero-López et al 38) disc/air 0.255 1.12 Xie et al 56) disc/air 0.226 not shown in all the papers, it is presumed that the crystal grains in previous studies were coarse since the fine powders were sintered at high temperature (for instance: Kong et al 54) sintered a nano-crystalline powder synthesized by a novel sol gel thermolysis method at 1450°C for 12 h, Marrero-López 38),55) sintered submicron sized powder prepared via a freeze-dried precursor route at 1400°C for 3 h, and Xie et al 56) sintered a powder synthesized via a nitrate-citrate route at 1450°C for 10 h to obtain a dense specimen with grain size of 7 15¯m as was confirmed by SEM). That is, it is estimated that the grain boundary density of the sample of this study is higher than that of other samples used in the previous studies.…”

“…The total conductivity of SMM has been measured in many previous studies; 33 55) prepared compacts by sintering SMM powder synthesized from a modified freeze-dried precursor and obtained activation energies of 0.270 and 1.43 eV for the total conduction in wet 5% H 2 /Ar and air, respectively. They also obtained different activation energies of 0.195 and 0.255 eV for measurements performed in 5% H 2 /Ar on discs prepared by sintering in 5% H 2 /Ar and air, respectively.…”

Solid Oxide Fuel Cell Anode Materials for Direct Hydrocarbon Utilization

“…The conductivity of Sr 2 Mg 1-x Mo x O 6-δ (SMMO) reached 10 S cm − 1 in H 2 and CH 4 at 800 ° C. [ 372 ] δ of SMMO increased with the increasing temperatures and the reducing pO 2 , with typical δ in the range from 0 to 0.06. [ 373 ] Utilizing a 300 mm-thick LSGM supported single cell, P max were 0.84, 0.44, and 0.34 W cm − 2 in H 2 , dry CH 4 , and wet CH 4 , respectively at 800 ° C. [ 374 ] Nevertheless, (Table 4 ). It unfortunately reacted with YSZ at temperatures above 1000 ° C. Under H 2 -rich atmospheres it decomposed into metallic Fe and layered Ruddelsden-Popper phases.…”

Influence of A-site Cation on Structure and Dielectric Properties in A2DyBiO6 (A=Mg, Ca, Sr, Ba) Double Perovskites

“…[4] These double perovskites are also used in various fields such as catalysis, [5] photocatalysis, [6] and solid oxide fuel cell (SOFC) materials. [7] Few reports have been made about double perovskites with Bi-cation on the B 0 -site. Byeon et al [8] studied the synthesis and characterisation of Ba 2 Bi V Fe III O 6 .…”