Nitrogen and oxygen-codoped carbon nanospheres for excellent specific capacitance and cyclic stability supercapacitor electrodes

Nitrogen and oxygen-codoped carbon nanospheres were prepared by adopting sodium alginate (SA) as the carbon precursor in the presence of polyaniline (PANI) through direct carbonization process. A typical sample (PANI/SA-800) obtained at the carbonization of 800 °C shows regular a spherical shape (∼130 nm in average diameter) and a relatively rich oxygen (11.71 at.%) and nitrogen (3.48 at.%) doping. When PANI/SA-800 is used as an electrode...