Abstract
Nitrogen-doped graphene sheets with different active center structures, such as amine N, quaternary N, pyridinic N, or pyrrolic N atoms, were successfully fabricated using targeted nitrogen precursors and a designed annealing process. Then, the nitrogen-doped graphene with a different structure is used as the active center for the growth of Co3O4 nanoparticles. The investigation results reveal that the interaction between loaded Co3O4 particles and amine N atoms doped in graphene sheets is stronger than those of quaternary N, pyridinic N, or pyrrolic N atoms, and leads to a smaller particle size of Co3O4 and a high specific surface area of composite electrodes which perform with better electrochemical behavior. The Co3O4/N-RGO 550 °C dominated with amine N atoms exhibits the highest capacitance of 3553 and 1967 F g–1 at 1 and 15 A g–1, respectively, which are apparently higher values than those of the other Co3O4 composite grown on the nitrogen-doped graphene dominated with pyridinic N, pyrrolic N, or qua...
Published Version
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