氮掺杂微孔-介孔多级孔炭材料及其电化学性能

摘要

Nitrogen-doped micro-meso hierarchical porous carbon (NHPC)was prepared by a combination of self-assembly approach and post-activation method using melamine-formaldehyde resin as precursors and F127 as template,and the electrochemical properties of NHPC were studied.N2 sorption and TEM analysis indicate that micropores can be generated on the mesopore wall and the pristine mesopores are basically preserved during post activiation.Electrochemical studies show that NHPC has a high electrocatalytic activity for I-/I-3 redox re-actions and a superior capacitive behavior (exhibiting a high capacitance of up to 257.8 F/g).The excellent elec-trochemical performance of NHPC can be attributed to its nitrogen doping,micro-meso hierarchical porous structure and high surface area,which favors the fast diffusion of electrolyte ion in the pore system and provides a high effective surface area and more electrochemical active sites.%以三聚氰胺-甲醛树脂为炭源,以 F127为模板剂,采用自组装结合后活化的方法制备具有微孔-介孔多级孔结构的氮掺杂炭材料(NHPC),并对这类材料的电化学性能进行了研究.N2吸附和 TEM 分析表明,KOH 的活化过程可以在介孔的孔壁上产生微孔,但没有破坏材料原有的介孔结构.电化学分析表明所制备的 NHPC 对 I－和 I－3之间的氧化还原反应具有较高的电催化活性,同时也具有优异的电容性能. NHPC 所表现的优异电化学性能可归因于氮的掺杂、特殊的多级孔结构及较大的比表面积,这一方面保证了电解质能够在材料多级孔体系中快速传输、同时又能保证材料具有较高的有效表面积.