掺N多孔碳/氧化镍锰和碳微纳米管的联合制备与电容性能的研究

Synthesis of N-doped porous carbon/nickel manganese oxide combined with carbon tubes and its capacitance property

以煤基聚苯胺为碳氮源,乙酸镍、二茂镍为催化剂前驱体,采用分段控温热解工艺和KMnO_4氧化工艺,成功实现掺N多孔碳/氧化镍锰和碳微纳米管的联合制备。分析发现,碳微米管管径在150~400nm之间,碳纳米管管径在60nm左右,壁厚约10nm。多孔碳以介孔为主,BET比表面积为801.59m^2/g,BJH平均孔径为47.87nm;并成功实现N掺杂,部分N以结晶性良好的CNx的状态存在。氧化镍锰主要以NiO的化学状态存在,伴生有NiMn_2O_4和α-MnO_2;并以纳米片的形态附着在多孔碳表面或插入在孔隙中。制备的掺N多孔碳/氧化镍锰的比电容为387.18F/g(1A/g),1 000次充放电后的比电容保持率为81.48%(5A/g)。

With coal/polyaniline composites as carbon and nitrogen source,nickel acetate and nickelocene as catalyst precursor,N-doped porous carbon/nickel manganese oxide and carbon tubes are synthesized synchronously through thestage-pyrolysis process in two-stage furnace and KMnO4 oxidation process.It＇s found that the diameter of most carbon microtubes is between 150 to 400nm.Most carbon nanotubes are about 60 nm in diameter and about 10 nm in thickness of their walls.Porous carbon is mainly mesoporous with BET specific surface area of 801.59m^2/g,BJH average pore diameter of 47.87 nm.Porous carbon is successfully doped by N element and part of N lists in the state of crystalline CNx.Nickel manganese oxide mainly exists in the chemical state of NiO andaccompanies NiMn_2O_4 and α-MnO_2.The compounds were attached to the porous carbon surface or inserted in the pores with the shape of nano sheets.N-doped porous carbon/nickel manganese oxide has the specific capacitance of 387.18F/g in the current density of 1A/g and maintains the specific capacitance retention of 81.48%in the current density of 5A/g after 1 000-cycle charging and discharging.