Al-Doped SrMoO3 Perovskites as Promising Anode Materials in Solid Oxide Fuel Cells



Downloads per month over past year

Cascos, Vanessa and Fernández Díaz, María Teresa and Alonso, José Antonio (2022) Al-Doped SrMoO3 Perovskites as Promising Anode Materials in Solid Oxide Fuel Cells. Materials, 15 (11). p. 3819. ISSN 1996-1944

[thumbnail of materials-15-03819.pdf] PDF
Creative Commons Attribution.


Official URL:


Two perovskite materials with SrMo1−xAlxO3−δ (x = 0.1, 0.2) compositions have been synthesized by reduction from the corresponding scheelite phases, with SrMo1−xAlxO4−δ stoichiometry; the pertinent characterization shows that the defective perovskites can be used as anode materials in solid oxide fuel cells, providing maximum output power densities of 633 mW/cm2 for x = 0.2. To correlate structure and properties, a neutron powder diffraction investigation was carried out for both perovskite and scheelite phases. Both perovskites are cubic, defined in the Pm-3m space group, displaying a random distribution of Mo and Al cations over the 1a sites of the structure. The introduction of Al at Mo positions produced conspicuous amounts of oxygen vacancies in the perovskite, detected by neutrons. This is essential to induce ionic diffusion, providing a mixed ionic and electronic conduction (MIEC), since in MIEC electrodes, charge carriers are combined in one single phase and the ionic conductivity can be one order of magnitude higher than in a conventional material. The thermal expansion coefficients of the reduced and oxidized samples demonstrated that these materials perfectly match with the La0.8Sr0.2Ga0.83Mg0.17O3−δ electrolyte, La0.4Ce0.6O2−δ buffer layer and other components of the cell. Scanning electron microscopy after the test in a real solid oxide fuel cell showed a very dense electrolyte and porous electrodes, essential requirements for this type of fuel. SrMo1−xAlxO3−δ perovskites are, thus, a good replacement of conventional biphasic cermet anodes in solid oxide fuel cells.

Item Type:Article
Uncontrolled Keywords:anode; scheelite; IT-SOFC; SrMoO3; perovskite; neutron diffraction
Subjects:Sciences > Chemistry > Chemistry, Inorganic
Medical sciences > Biology > Cytology
ID Code:75111
Deposited On:19 Oct 2022 11:44
Last Modified:19 Oct 2022 12:02

Origin of downloads

Repository Staff Only: item control page