Effect of Metal Precursor Solution on Morphology of Porous LaCoO3

Sukit Boonlha; Pongkarn Chakthranont; Sutasinee Kityakarn

doi:10.4028/www.scientific.net/SSP.302.135

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Effect of Metal Precursor Solution on Morphology of Porous LaCoO₃

Abstract:

Porous materials are attractive in various applications such as energy storage and production, industrial processing, environmental treatment, and catalysis. Porous LaCoO₃ was prepared using three different metal precursor solutions: i) 40%v/v methanol-ethylene glycol (40%Me/EG), ii) Lysine (Lys), and iii) Lysine/citric acid (Lys/Cit) with poly(methyl methacrylate) colloidal crystal as porous templates (PMMA-CCT). PMMA-CCT filled with metal precursor solution were carbonized under N₂ followed by oxidized under 50% O₂ in N₂ atmosphere. X-ray diffraction patterns of the obtained porous LaCoO₃ are rhombohedral LaCoO₃ phase without impurity. The scanning electron microscopy (SEM) was carried out to examine the morphology of porous LaCoO_3. The SEM image of the LCO-Lys/Cit exhibits better connected particles and a well-defined pore structure compared to those prepared by Lys or 40%Me/EG metal precursor solutions. The evolution of pore formation of LCO-Lys/Cit was investigated by SEM, Fourier transform infrared spectroscopy (FT-IR), and thermal gravitational analysis (TGA). The materials show high catalytic properties for the electrochemical water oxidation reaction. The high capacitances of all porous LaCoO₃ are attributed to the controlled three-dimensional porous morphology of the catalysts. This synthesis approach can achieve porous materials with promising properties for catalysis applications.

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Solid State Phenomena (Volume 302)

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135-140

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https://doi.org/10.4028/www.scientific.net/SSP.302.135

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April 2020

Authors:

Sukit Boonlha, Pongkarn Chakthranont, Sutasinee Kityakarn*

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LaCoO₃, Perovskite, Porous Materials, Porous Perovskite Formation Mechanism, SEM

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