A novel method to prepare a nanotubes@mesoporous carbon composite material based on waste biomass and its electrochemical performance

摘要: Hierarchical nanotubes@mesoporous carbon composite materials were controllably synthesized by an innovative method based on plant waste corncob and nitrogen source melamine via thermal treatment. The provides both a small amount of Fe as the catalyst, while offers source. Corncobs firstly pretreated with concentrated sulfuric acid then mixed melamine. After calcination at 800 °C for 2 hours, new material unique structure large thin walled nitrogen-doped nanotubes orderly vertically growing mesoporous frame was obtained. diameter is ∼50 nm their length varies from 0.1–20 μm, which could be controlled adjusting ratio to Meanwhile, possesses stable interconnected pores channels high surface area 1100 m2 g−1, significantly accelerated transfer rates ions electrons. electrochemical test results demonstrated that this exhibits superior capacitance 538 F g−1 in aqueous electrolyte 320 organic current density 1 A g−1. specific remained up 90% initial value after 10 000 cycles, showing excellent long-term cycling stability. For lithium sulfur battery application, host delivered capacity 1047 mA h exhibited relatively performance, maintained 682 300 charge/discharge cycles 0.5C. structure, morphology growth mechanism also analyzed discussed detail.