In situ construction of carbon nanotubes/nitrogen-doped carbon polyhedra hybrids for supercapacitors

摘要: Abstract Recently utilizing metal-organic frameworks (MOFs) as precursors to prepare porous carbons for supercapacitors application has attracted enormous attention. Unfortunately, such MOFs-derived are mostly microporous and of low graphitization degree, which considered unfavorable the ion electron transport. Further efforts need be made address this issue. Here we propose a new hybrid carbon nanotubes (CNTs)/nitrogen-doped polyhedra (NCP) structure, was fabricated via using CNTs substrate in situ growth MOFs, [Zn(2-MeIM)2] (2-MeIM: 2-methylimidazolate, ZIF-8) with subsequent annealing process. The resultant CNTs/NCP possesses high specific surface area 898.0 m2 g−1 nitrogen content 9.43 wt%. When applied supercapacitor electrode, it exhibits maximum capacitance 308.0 F g−1 at scan rate 5 mV s−1 1 M H2SO4 aqueous electrolyte measured three-electrode system, even 200 mV s−1, still reaches 200.6 F g−1. Furthermore, CNTs/NCP-based symmetric energy density 12.0 W h Kg−1 good cycle ability. It is believed that should promisingly applicable performance electrode material.