| Abstract [eng] |
Li+, Na+ and K+ ions electrochemical insertion into molybdenum oxide thin films was investigated. First, the optimum conditions for molybdenum oxide thin films electrodeposition on stainles steel substrates from 0,05 M Na2MoO4⋅2H2O and 0,2 M H6N2O3S solutions were found. X-ray diffraction analysis have shown that regular crystal structure MoO2 and MoO(OH)2 was electrodeposited. Surface composition was studied by X-ray photoelectron spectroscopy. It have shown that the surface of the film contains MoO2, MoO3 and Mox(OH)y. Morphological properties studies showed that the film is made of spherical particles ranging in size from 4 to 10 μm. Cyclic voltammetry and chronoamperometry methods were used for electrochemical and capacitive behavior studies of molybdenum oxide thin films in 0,05 M Li2SO4, Na2SO4 and K2SO4 solutions. Cyclic voltammetry results have shown that the process is quasi-reversible and in a potential range between 0 and -0,7 V metal ions were inserted. Capacitive behavior studies showed that the biggest amounts of metal ions were electrochemically inserted into molybdenum oxide thin films during the first cycle. The highest gravimetric capacity equal to 2,74 F/g was obtained by inserting Na+ ions. |
