Electrochemical behaviour of Co-doped LSGM perovskites prepared by sol-gel synthesis

Abstract

La0.8Sr0.2Ga0.8Mg0.2-xCoxO3-δ (LSGMC) powders containing different amounts of Co (x = 0.05 and 0.085) were prepared by a citrate sol-gel method. Crystalline powders were obtained by firing at 1000°C (10 h) and dense high-purity pellets were prepared by pressing (300 MPa) and sintering in air at 1475°C (5, 10 and 20 h). The sintered pellets of LSGMC were characterized by X-Ray Diffraction (XRD) Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS). The conductivity of sintered LSGMC pellets containing different amounts of Co ions in the B sites of the perovskite lattice was assessed by electrochemical impedance spectroscopy (EIS) in the 250–750 °C temperature range. Conductivity values and apparent activation energies were in good agreement with previously published data referring to materials with same composition, but prepared by solid-state reaction.

X-ray photoemission study ofSr2FeMoO6andSrMoO4films e

“…The binding-energy positions of these Sr 3d features are in good accord with the literature values for Sr 2+ in a perovskite structure. 31,32 Sputtering did not appear to change the overall intensity or the profile of the dou-blet, which indicates that the SrMoO 4 overlayer and the Sr 2 FeMoO 6 film have similar local chemical environments for the Sr atoms. Sr is coordinated to four Mo atoms in the tetragonal hole in SrMoO 4 ͑Ref.…”

Catalytic Mechanism of Oxygen Vacancies in Perovskite Oxides for Lithium–Sulfur Batteries

“…However, the new peak at about 132.9 eV corresponds to the SrS bond (Figure 2c,f). [ 42 ] With the increase of oxygen‐vacancy concentration, the peaks of the LiO bond and SrS bond enhanced, and the adsorptive property of LiPSs strengthened. Figure S4, Supporting Information, shows the molecular adsorption model and the corresponding binding energy of the soluble intermediate product Li 2 S 4 and the final discharge product Li 2 S on the surface of perovskites STO 3 and STMn 0.3 .…”

Misfit‐Layered Bi1.85Sr2Co1.85O7.7−δ for the Hydrogen Evolution Reaction: Beyond van der Waals Heterostructures

“…The three sets of components were present in an average ratio of 0.26:0.47:0.27 and correspond to the presence of Sr 2+ ions, SrO, and SrCO 3 , respectively 14. The presence of Sr 2+ ions could be attributed to random vacancies in an oxygen‐deficient structure,17 and the occurrence of SrCO 3 most likely resulted from exposure of BSC to the atmosphere resulting in the chemisorption of carbon dioxide and water vapor 18…”