Hybrid Electrode Materials for Supercapacitors Based on Nanostructured Carbon Matrix Composites Filled with Chromium Oxides and Hydroxides

Preparation methods of nanostructured composites based on various carbon materials filled with chromium oxides and hydroxides were developed via reduction of potassium dichromate with hydrazine. Materials with different parameters of the porous structure and specific surface, such as microporous Kem10 and mesoporous Carb3, and also carbon nanotubes (non-ozonised CNT-1 and ozonised CNT-2), were used as carbon matrixes. As demonstrated by research on asymmetrical cells of a supercapacitor with working electrodes based on the resulting nanocomposites via a set of electrochemical methods (cyclic voltammetry, chronopotentiometry, and impedansometry), surface decoration of matrixes with chromium oxides and hydroxides leads to an increase in capacitance and a decrease in the inner resistance of supercapacitor cells.