Electrodeposition of polypyrrole-carbon nanotube composites for electrochemical supercapacitors

► Composite polypyrrole-carbon nanotube films were obtained electrochemically. ► Pyrocatechol violet was used as anionic dopant, dispersing and charging agent. ► Composite films were investigated for applications in electrochemical supercapacitors. ► Stainless steel foils and porous nickel plaques were used as current collectors. ► Nickel plaques allowed higher capacitance and higher materials loading.