Perovskites, such as rare earth ortho-ferrites (RFeO3) present a wide range of technological applications, including oxygen sensors, ceramic membranes for conversion of various hydrocarbons, cathode material for fuel cells and catalysts for hydrocarbon oxidation or hydrogenation. LaFeO3 and its calcium substituted La1-xCaxFeO3-d derivatives are structurally robust materials exhibiting a good oxygen diffusivity. This being suitable for the design of electrodes in environmentally-friendly energy storage applications because they are Li free and allow for the oxygen ions to be extracted/inserted topotactically via redox reactions. Along with improved oxygen diffusivity, a battery material should possess a high porosity in order to facilitate the extraction/insertion of cations.In this work, we report on the rational design of microporous LaFeO3 and La1-xCaxFeO3-d micropowders for use in the design of electrodes for Li-free batteries.  The morphology, phase purity, chemical composition and specific area of the resulting powders were characterized by a variety of techniques including microscopy, X-ray and electron diffraction, spectroscopy, surface area and thermal analysis. Preliminary results indicated that single phase materials can be obtained by varying the annealing temperature, whereas the pore size can be controlled by adjusting the heating rate during the post-synthesis annealing process. In the next step of this work the powders are to be incorporated into electrodes and their electrochemical characterization will be performed.

Soft-solution processing of pristine and doped LaFeO<sub>3</sub> microcrystalline powders for applications in energy storage

248th National Meeting (2014)

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Soft-solution processing of pristine and doped LaFeO3 microcrystalline powders for applications in energy storage

Soft-solution processing of pristine and doped LaFeO₃ microcrystalline powders for applications in energy storage