▎ 摘　　要

Three polyaniline/graphene oxide (PANI/GO) composites were fabricated by means of an in-situ polymerization of aniline monomers in the presence of graphene oxide (GO). And then, nitrogen-doped graphene was prepared by pyrolysis of the PANI/GO composite. The structures and morphologies of the samples were characterized by using different techniques, and the electrochemical performances of the nitrogen doped graphene samples were further investigated. When PANI/GO10 (the GO feed content in PANI/GO is 10 wt.%) was used as a precursor, and the pyrolysis temperature is 800 degrees C, nitrogen content of the as prepared nitrogen-doped graphene (i.e., NG10-800) is 9.2 at.%. The specific capacitance of NG10-800 is up to 206 Fg(-1) at a current density of 1 A g(-1), indicating an excellent electrochemical performance. After 1000 cycles at a scan rate of 50 mV s(-1), the capacitance retention of NG10-800 is about 92.5% of the initial value, suggesting an excellent cycling stability. (C) 2016 Elsevier B.V. All rights reserved.