Nitrogen-doped hierarchical meso/microporous carbons were successfully synthesized from tangerine peel through pyrolytic activation at elevated temperature in nitrogen atmosphere, utilizing potassium hydroxide as activator and melamine as nitrogen source. The resulting optimal hierarchical carbon (denoted as NBC-600) possessed a high specific surface area of 601.49 m 2 ·g −1 , along with a nitrogen doping level of 2.5 %, both of which contribute significantly to its outstanding supercapacitive performance. Electrochemical evaluations reveal...
