The CNT@CZIF-1 composite materials were prepared by dispersing CNT@PDA in methanol, and added to Zn(NO3)2.6H2O, and 2-methylimidazole simultaneously, stirred at room temperature for 3 min, and calcined under Ar flow at 800 ˚C for 3 h. In a similar way, CNT@CZIF-2 was prepared, except for the reaction time of ZIF-8 growth prolonged to 30 min. XPS studied showed the doping of nitrogen atom originated from 2-methylimidazole blocks of ZIF-8. The at% of N-doping were found to be 0, 0.61, 1.65, and 4.1 % for CNT, CNT@PDA, CNT@CZIF-1, and CNT@CZIF-2, respectively. CNT@CZIF-2 had the maximum amount of nitrogen, suggesting the largest charge polarization degree in the carbon matrix. The specific SBET was determined from BET analysis, which indicated that both CNT@CZIF-2 (287 m 2 g -1 ), and CNT@CZIF-1 (264 m 2 g -1 ) had lower SBET than that of CNT