Preparation of nitrogen‐doped carbon materials by orthogonal array design for supercapacitors

Abstract

AbstractHere, the authors report a practical method for preparing nitrogen‐doped carbon materials using an orthogonal array design. The material with the highest specific capacitance value of 262 F·g−1 at a current density of 1 A·g−1 was obtained under the conditions (KOH as activation agent, activation temperature of 600°C, activation time of 3 h, respectively). Its high electrochemical properties are attributed to its high surface area and additional pseudo‐capacitance. After 5000 cycles, the specific capacitance remained 92.8%, with good cycle stability. Textural characterization of the carbon materials was performed using N2 adsorption/desorption and scanning electron microscopy.