Structural properties and electrical conductivity of perovskite-type oxides in SOFCs

Abstract

Structural properties and electrical conductivity of Sr2MgMoO6 (SMMO) and Sr2MgMo0.9TM0.1O6-δ (TM = Co, Mn) compounds were analyzed for establishing the usefulness of these materials as Solid oxide fuel cells (SOFC) anode. SMMO and SMMTM were synthesized through combustion-solution method and annealing in air at temperatures between 1000 and 1200 °C. SMMO and SMMCo with triclinic structures, and SMMMn with tetragonal structure at room temperature showed a cubic symmetry at 800 °C, which are apparently coking-resistant. Mn-doping in SMMO is detrimental for electrical conductivity in diluted-H2 environment, whilst the highest conductivity value was recorded for Co-containing sample on Mo-site of SMMO double perovskite. On the other hand, the oxygen reduction reaction of Pr2-xNdxNiO4+δ, (x=0, 0.3, 1 and 1.7) SOFC cathodes deposited on La0.9Sr0.1Ga0.8Mg0.2O2.85 electrolyte was studied by electrochemical impedance spectroscopy. The obtained results showed that the chemical reactivity between Pr2-xNdxNiO4+δ oxides with electrolyte materials is a serious drawback in their use as cathode in SOFC.

Effect of Mn Doping on the Optical and Electrical Properties of Double Perovskite Sr2TiCoO6

“…This phenomenon is due to the well-formed grain boundaries that normally impede the diffusion of electrons, thus decreasing conductivity [ 42 ]. The reported conductivity values in this study are relatively low compared to the results reported by Žužić et al and Hernandez et al [ 43 , 44 ]. This is due to selection of different synthesis processes and differences in calcination temperatures.…”

Performance of sodium-ion supercapattery using LaMnO3 and rGO in non-aqueous electrolyte

“…Undoubtedly, the specific energy and specific power achieved in the present case are much higher compared to the values reported elsewhere. 18,27–29 As confirmed from the Raman, FT-IR, XPS, and impedance analyses results, the LaMnO 3 has intrinsic defects. The intrinsic defect seems to have facilitated efficient faradaic reaction during charge/discharge, resulting in high specific energy.…”

“…, La, Sr or Ca) and B can be a transition metal, such as Mn, Co, Fe, Ni, Cr or Ti. 18 LaMnO 3 is a lanthanum-based perovskite oxide and it was the first of its kind. 19 Perovskites have good ionic conductivity and thermal stability owing to the defects associated with the crystal lattice, as well as high electron mobility, and hence they find extensive use as catalysts.…”

Undoped Sr2MMoO6 Double Perovskite Molybdates (M = Ni, Mg, Fe) as Promising Anode Materials for Solid Oxide Fuel Cells

“…As Sr 2 NiMoO 6-δ , Sr 2 MgMoO 6-δ can be obtained through different synthesis methods: solid state synthesis [ 19 , 97 , 98 , 99 , 100 , 101 , 102 , 103 ], solution methods (including sol-gel technology using citric acid [ 24 , 37 , 45 , 72 , 104 , 105 , 106 , 107 ] and EDTA [ 20 , 76 , 77 , 108 , 109 ]), the combustion method using glycine as a fuel and complexing agent [ 110 , 111 ] and the freeze-drying method [ 88 , 108 ]. The main disadvantage of this compound is its non-single phase after synthesis in air ( Figure 8 ).…”