Vanadium nitride quantum dot/nitrogen-doped microporous carbon nanofibers electrode for high-performance supercapacitors
Vanadium nitride quantum dot/nitrogen-doped microporous carbon nanofibers electrode for high-performance supercapacitors
复制标题
DOI：
10.1016/j.jpowsour.2017.01.095
复制
发表时间：
2017-03
影响因子：
9.2
通讯作者：
Yage Wu;F. Ran
中科院分区：
文献类型：
--
作者：
Yage Wu;F. Ran
本文采用静电纺丝和高温煅烧相结合的方法，在NH3：N2= 3：2的气氛下制备了用于高性能超级电容器的氮化钒量子点/氮掺杂微孔碳纳米纤维（VNQD/CNF）。VNQD分散在CNF中，碳体中掺杂的N原子富集，丰富的多孔结构不仅可以阻止VN纳米颗粒的生长和聚集，提高电极材料的导电性、润湿性和稳定性，还可以增强电解质离子的快速迁移。在电化学过程中。因此，VNQD/CNF在0.5 A g− 1时具有406.5 F g− 1的高比电容，在5.0 A g−1时具有75.1%的电容保持率。此外，将VNQD/CNF作为负极与Ni（OH）2作为正极组合以制备VNQD/CNF//Ni（OH）2的混合超级电容器。值得注意的是，在774.6 W kg−1的功率密度下，超级电容器设备提供31.2 Wh kg−1的可再生能量密度。
In this article, vanadium nitride quantum dot/nitrogen-doped microporous carbon nanofibers (VNQD/CNF) is developed by a method of combination of electrostatic spinning and high-temperature calcination under the atmosphere of NH3: N2= 3: 2 for high performance supercapacitors. VNQD dispersing into CNF, enrichment of N atom doped in carbon bulk, and abundant porous structure not only prevent the growth and aggregation of VN nanoparticles, improve electrical conductivity, wettability, and stability of the electrode materials, but also enhance fast migration of electrolyte ions during the electrochemical process. Thus, VNQD/CNF exhibits a high specific capacitance of 406.5 F g−1at 0.5 A g−1and a good rate capability with a capacitance retention of 75.1% at 5.0 A g−1. Additionally, VNQD/CNF as a negative electrode are combined with Ni(OH)2as a positive electrode to fabricate the hybrid supercapacitor of VNQD/CNF//Ni(OH)2. Remarkably, at a power density of 774.6 W kg−1, the supercapacitor device delivers an ultrahigh energy density of 31.2 Wh kg−1.