Nitrogen self-doped activated carbons the direct activation of leaves for high energy density supercapacitors.

In this study, nitrogen self-doped activated carbons (ACs) obtained the direct activation of green leaves (SSLs) for high energy density supercapacitors were investigated. The SSL-derived direct-activated carbons (hereinafter referred to SD-ACs) were synthesized by impregnating sodium hydroxide as an activating agent and heating up to 720 °C without a hydrothermal carbonization or pyrolysis step. The optimum condition was investigated by varying the weight ratio of raw SSLs to NaOH.