Design, Synthesis, Structure and Properties of Ba-Doped Derivatives of SrCo0.95Ru0.05O3−δ Perovskite as Cathode Materials for SOFCs

Abstract

We have designed and prepared a novel cathode material for solid oxide fuel cell (SOFC) based on SrCo0.95Ru0.05O3−δ perovskite. We have partially replaced Sr by Ba in Sr0.9Ba0.1Co0.95Ru0.05O3−δ (SBCRO) in order to expand the unit-cell size, thereby improving the ionic diffusion of O2− through the crystal lattice. The characterization of this new oxide has been studied at room temperature by X-ray diffraction (XRD) and neutron powder diffraction (NPD) experiments. At room temperature, SBCRO perovskite crystallizes in the P4/mmm tetragonal space group, as observed from NDP data. The maximum conductivity value of 18.6 S cm−1 is observed at 850 °C. Polarization resistance measurements on LSGM electrolyte demonstrate an improvement in conductivity with respect to the parent Sr-only perovskite cathode. A good chemical compatibility and an adequate thermal expansion coefficient make this oxide auspicious for using it as a cathode in SOFC.

Barium‐doped Sr2Fe1.5Mo0.5O6‐δ perovskite anode materials for protonic ceramic fuel cells for ethane conversion

“…The first weight loss interval (below 280°C) is attributed to the elimination of adsorbed substances (H 2 O, CO 2 ) from the sample surface. The change in mass loss at 280°C–600°C can be attributed to a fracture of the Fe–O bond leading to a lack of lattice oxygen ($${\rm{O}}_{\rm{O}}^ \times $$) in the surrounding atmosphere (Equations () and ()) 38,39 . The continued increase in oxygen loss associated with higher doping amounts indicates a rise in the oxygen vacancy ($${\rm{V}}_{\rm{O}}^{ \cdot \cdot }$$) concentration.…”

“…The change in mass loss at 280 • C-600 • C can be attributed to a fracture of the Fe-O bond leading to a lack of lattice oxygen (O × O ) in the surrounding atmosphere (Equations ( 1) and ( 2)). 38,39 The continued increase in oxygen loss associated with higher doping amounts indicates a rise in the oxygen vacancy (V ⋅⋅ O ) concentration. The mass change observed to occur at 600 • C-800 • C can be attributed to a rupture of the Mo-O bond leading to a lack of lattice oxygen (Equation (3)).…”

Recent Progress in the Design, Characterisation and Application of LaAlO3- and LaGaO3-Based Solid Oxide Fuel Cell Electrolytes

“…The chemical compatibility of La 1−x Sr x Ga 1−y Mg y O 3−δ was investigated with oxide materials used in SOFCs, cathodes [141][142][143][144][145][146][147][148][149][150][151][152] and anodes [153][154][155][156][157][158][159][160][161][162][163][164][165][166][167]: this is presented in the corresponding reviews [28,56,153].…”

“…Sydyknazar et al [143] showed that La 0.83 Sr 0.17 Ga 0.8 Mg 0.2 O 3−δ exhibited good chemical compatibility with a novel cathode material, Sr 0.9 Ba 0.1 Co 0.95 Ru 0.05 O 3−δ , after joint calcination at 1100 • C for 12 h. According to the literature, La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3−δ does not react with the following cathodes: La 0.4 Sr 0.6 Co 0.9 Sb 0.1 O 3−δ after heat treatment at 1150 • C for 6 h [144], SrCo 0.8 Fe 0.1 Nb 0.1 O 3−δ at 950 • C for 10 h [145], BaCo 0.7 Fe 0.2 Ta 0.1 O 3−δ at 950 • C for 10 h [146] and Sr 2 Ti 0.8 Co 0.2 FeO 6−δ after at 950 • C for 10 h [147]. According to Tarancón et al [148], La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3−δ interacted with a GdBaCo 2 O 5+δ cathode at temperatures above 900 • C, forming BaLaGa 3 O 4 and BaLaGa 3 O 7 secondary phases.…”

Characterization of Sr1-xYxCoO3- (X= 0.1, 0.2) Perovskites as Plausible Cathode Materials in Solid Oxide Fuel Cells

“…Therefore, it is necessary to stabilize the 3C phase in the temperature range in which a SOFC would normally operate. Much research has been conducted to stabilize this phase in a large temperature range, mainly by replacing some strontium [21][22][23][24] or cobalt [25][26][27] by aliovalent elements.…”