Effect of additional B-site transition metal doping on oxygen transport and activation characteristics in La0.6Sr0.4(Co0.18Fe0.72X0.1)O3−δ (where X = Zn, Ni or Cu) perovskite oxides

The bulk structure, surface characteristics and catalytic properties of perovskite-type oxides with the formula La0.6Sr0.4(Co0.18Fe0.72X0.1)O3−δ with X = Zn, Ni and Cu have been investigated. With additional B-site doping with divalent cations, the oxygen vacancy generation properties were significantly enhanced, while still maintaining a stable perovskite structure. The Zn-doped sample showed the best performance and was further characterized for surface structure and properties. CO2 TPD and methane oxidation experiments were conducted to gauge the oxygen activation and oxygen mobility and the Zn-doped catalyst showed improved performance over the baseline La0.6Sr0.4Co0.2Fe0.8O3−δ catalyst, making it a potential SOFC cathode catalyst.

Figure optionsDownload as PowerPoint slideResearch highlights
► Improved oxygen vacancy generation with B-site doping in LSCF perovskites.
► Characterization of surface properties with methanol as a probe molecule.
► Oxygen activation studied by methane oxidation and CO2 TPO.
► B-site substitution with Zn improves oxygen activation and mobility.