Phosphorus-doped carbon–carbon nanotube hierarchical monoliths as true three-dimensional electrodes in supercapacitor cells

Phosphorus-doped carbon–carbon nanotube hierarchical monoliths exhibiting energy densities of around 22.6 W h kg −1 at power densities of up to 10 kW kg −1 were capable of functioning as true three-dimensional electrodes in supercapacitor cells.