Study of Sr2MgMo0.9Ni0.1O6-δas SOFC Anode

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.

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

Skutina

Филонова

Medvedev

et al. 2021

Materials

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The chemical design of new functional materials for solid oxide fuel cells (SOFCs) is of great interest as a means for overcoming the disadvantages of traditional materials. Redox stability, carbon deposition and sulfur poisoning of the anodes are positioned as the main processes that result in the degradation of SOFC performance. In this regard, double perovskite molybdates are possible alternatives to conventional Ni-based cermets. The present review provides the fundamental properties of four members: Sr2NiMoO6-δ, Sr2MgMoO6-δ, Sr2FeMoO6-δ and Sr2Fe1.5Mo0.5O6-δ. These properties vary greatly depending on the type and concentration of the 3d-element occupying the B-position of A2BB’O6. The main emphasis is devoted to: (i) the synthesis features of undoped double molybdates, (ii) their electrical conductivity and thermal behaviors in both oxidizing and reducing atmospheres, as well as (iii) their chemical compatibility with respect to other functional SOFC materials and components of gas atmospheres. The information provided can serve as the basis for the design of efficient fuel electrodes prepared from complex oxides with layered structures.

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Study of Sr₂MgMo_0.9Ni_0.1O_6-δas SOFC Anode

Cited by 3 publications

References 20 publications

Effect of transition metal doping on the crystal structure and oxidation state of Sr2MgMo0.9TM0.1O6− compounds (TM = Co, Mn or Ni)

Effect of transition metal doping on the crystal structure and oxidation state of Sr2MgMo0.9TM0.1O6− compounds (TM = Co, Mn or Ni)

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

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

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