Synthesis, characterization and electrochemical properties of cobalt-doped phosphate tungsten heteropoly acid and its bronze Original scientific paper
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Abstract
Heteropoly acids and their compounds are a fascinating class of multifunctional materials for use in various fields: medicine, magnetism, catalysis and nonlinear optics, as well as for electrochemistry and battery materials. This study used tungsten-phosphate heteropoly acid to synthesize and characterize its Co doped salt (Co-PWA) and tungsten-phosphate bronze (Co-PWB). Thermal analysis was used to determine Co-PWA salt phase transition into
Co-PWB bronze occurring at 588 °C. Both samples were further characterized using Fourier transform infrared spectroscopy, X-ray powder diffraction and scanning electron microscopy containing energy dispersive X-ray spectroscopy, and by use of electrochemical examinations. Cyclic voltammetry (as a rapid analytical method) showed that both materials yielded low capacities in an aqueous solution of LiNO3. However, a “slow” analytical method, chronopotentiometry, in which more places of a crystal lattice are occupied with ions (as compared to cyclic voltammetry), yielded solid and stable discharge capacity, making Co-PWB attractive as a potential electrode material for aqueous Li-ion batteries. The results obtained fill the gap in the scientific literature dealing with similar materials.
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Ministarstvo Prosvete, Nauke i Tehnološkog Razvoja
Grant numbers 451-03-66/2024-03/200026;451-03-66/2024-03/200051;451-03-66/2024-03/200146;451-03-65/2024-03/200126 -
HORIZON EUROPE European Innovation Council
Grant numbers 101115149 -
Office of Naval Research Global
Grant numbers N62902-22-1-2024
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