Dual-engineering Preparation and Electrochemical Properties of Nitrogen-doped Mesoporous Carbon Materials
The extent of precursor condensation reaction was explored at different pre-activation temperatures(90℃,140℃,180℃and 250℃)using urea as nitrogen source and polyvinylpyrrolidone as carbon source via hard template method and foaming strategy.The morphology was analyzed by SEM,and the effect of different foaming temperatures on pore size was analyzed by BET to explore their electrochemical performance as electrode materials.The results show that the calcined NPCNs samples at the pre-activation temperature of 180℃have a three-dimensional network morphology,high specific surface area and rich hierarchical porous structure.Meanwhile,the NPCNs exhibited good electrochemical performance and high electrical conductivity,with a specific capacitance as high as 382 F/g at a sweep rate of 1 mV/s.Even at a current density of 2 A/g,the NPCNs possessed a capacity retention of nearly 100% after 1,000 cycles,and a discharge specific capacity as high as 302 F/g.
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