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基于金属氧化物存储机制,MoO_3比MoO_2具有更高的理论容量.本文通过热的硝酸氧化MoO_2@C纳米线成功制备出具有400.2 m2g~-1高比表面积的多孔h-MoO_3@C纳米纤维,且碳壁没有明显破坏.作为锂离子电池的负极,与MoO_2@C纳米线相比多孔h-MoO_3@C纳米纤维电极表现出更好的性能,其中在2 Ag~(-1)的电流密度下500循环后展现出302.9 mAhg~-1的可逆容量.作为钠离子电池的负极,h-MoO_3@C电极同样具有很好的倍率性能.在2 Ag~(-1)的电流密度下500循环后仍具有108.9 mAhg~-1的容量,并且在2 Ag~(-1)的电流密度下1200循环后还能保持91 mAhg~-1的容量.由于碳壁可以维持结构的完整性且可提高导电性;同时h-MoO_3的隧道结构可作为分离电子孔并为Li+/Na+嵌入脱出提供更多的特有位置,使得该复合纳米线作为电极材料表现出更好的性能.本工作为合成具有高价的过渡金属氧化物/碳复合材料在电池和催化剂领域的运用提供了依据.
Based on the metal oxide storage mechanism, MoO 3 has a higher theoretical capacity than MoO 2. In this paper, porous h-MoO 3 @ C nanofibers with high specific surface area of 400.2 m 2 g -1 were successfully prepared by hot nitric oxide MoO_2 @ C nanowires, As the negative electrode of lithium ion battery, the porous h-MoO 3 @ C nanofibrous electrode showed better performance than the MoO_2 @ C nanowire, in which the current density at 2 Ag ~ (-1) After 500 cycles, it exhibited a reversible capacity of 302.9 mAhg ~ (-1) .As the negative electrode of sodium ion battery, the h-MoO 3 @ C electrode also has good rate capability .500 cycles at a current density of 2 Ag -1 Still possesses a capacity of 108.9 mAhg ~ -1 and maintains a capacity of 91 mAhg ~ 1 after 1,200 cycles at a current density of 2 Ag ~ Since the carbon wall can maintain the structural integrity and can improve While the tunneling structure of h-MoO 3 can provide more unique positions for the separation of electron holes and Li + / Na + intercalation and deintercalation, which makes the composite nanowires exhibit better performance as electrode materials.This work is to synthesize high- Transition Metal Oxide / Carbon Composites in the Field of Batteries and Catalysis By providing a basis.