Polycrystalline La Sr Cr Co O (0.0 ≤ x ≤ 0.4) solid solutions were synthesized by a sol-gel method using citric acid as 0.9 0.1 1−x x 3 chelating agent. Thermogravimetric and differential thermal analysis, Fourier-transform infrared spectroscopy, and X-ray dif- fraction (XRD) techniques are used to explore precursor decomposition and to establish adequate calcination temperature for the preparation of the polycrystalline. The samples obtained after calcination at 750 °C were characterized by several techniques. X- ray diffraction analyses reveal that that B-site doping of Co may lead to the transformation of its crystal structure from an orthorhombic to a rhombohedral phase, when Co content x ≥ 0.2. Scanning electron microscopy (SEM) shows that all samples have almost spherical nanoparticles with high crystallization. The increase in the fraction of the doped-Co leads to high agglom- eration of particles while the porosity increases. Electrochemical measurements indicate that the catalytic activity toward meth- anol oxidation in alkaline solution is strongly influenced by cobalt doping. La Sr Cr Co O -modified electrodes responded 0.9 0.1 0.6 0.4 3 −2 extremely well to methanol by giving high anodic current for methanol oxidation (over 46 mA cm at 0.650 V vs Hg/HgO). . .
Journal of the Australian Ceramic Society – Springer Journals
Published: May 29, 2018
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