Structurally Dependent Electrochemical Properties of Ultrafine Superparamagnetic 'Core/Shell' γ-FeO/Defective α-FeO Composites in Hybrid Supercapacitors.

The paper presents a method for obtaining electrochemically active ultrafine composites of iron oxides, superparamagnetic 'core/shell' γ-FeO/defective α-FeO, which involved modifying sol-gel citrate synthesis, hydrothermal treatment of the formed sol, and subsequent annealing of materials in the air. The synthesized materials' phase composition, magnetic microstructure, and structural, morphological characteristics have been determined via X-ray analysis, Mossbauer spectroscopy, scanning electron microscopy (SEM), and adsorption porometry. The mechanisms of phase stability were analyzed, and the model was suggested as FeOOH → γ-FeO → α-FeO.

The Effect of Sulphate Anions on the Ultrafine Titania Nucleation.

The phenomenological model of sulphate anions effect on the nanodispersed titania synthesis during hydrolysis of titanium tetrachloride was studied. It was proposed that both chelating and bridging bidentate complexes formation between sulphate anions and octahedrally coordinated [Ti(OH)(OH)] mononers is the determinative factor for anatase phase nucleation.