Composite Based on Multi-Walled Carbon Nanotubes and Manganese Oxide with Rhenium Additive for Supercapacitors: Structural and Electrochemical Studies

The structure and electrochemical characteristics of composites based on multi-walled carbon nanotubes (MWCNTs) manganese oxide with the addition rhenium has been studied. It shown that decorating MWCNT surface layers or nanoparticles (Mn(III) + Mn(IV)) provides more than a twofold increase in value specific capacitance at low potential scan rates. However, only exhibit poor behavior decreases rapidly increasing rate due to limitation diffusion processes. significantly increases their properties changes chemical composition morphology composites. Studies state have an improvement is provided by proportion Mn(IV) such composites, which ability completely reverse redox reactions lower electrical resistance values, compared Mn(III) oxide. A detailed analysis voltammetric data showed capability can also be availability electrode for electrolyte ions amount charge stored formation double electric layer.