【作者】 姜鑫； 鲁巍； 邢艳；

【Author】 Xin Jiang;Wei Lu;Yan Xing;Key Laboratory of Advanced Energy Materials in Jilin Province,Chemical College of Northeast Normal University;

【机构】 吉林省先进能源材料重点实验室东北师范大学化学学院；

【摘要】 作为一种新兴的负极材料,氮化钒（VN）由于其较高的比容量、优异的导电性和合适的负电位窗口而引起广泛关注^[1]。Kumta等人利用VCl₄作为钒源,通过氨气还原法合成了氮化钒纳米晶,在电流密度为当扫描速率为2 m V s^-1时,比电容可以达到1340 F g^-1[2]。然而,由于氮化钒表面存在的氧化层（VO_x）使其在碱性电解液中表现出较差的循环稳定性,严重的阻碍了VN作为超级电容器材料的实际应用^[3]。本工作通过简单的一步法合成了Ni/VN/NC纳米复合物,小尺寸的Ni纳米粒子和VN纳米粒子共同嵌入到N掺杂碳（NC）纳米片中作为超级电容器的负极材料。氮掺杂碳纳米片作为支撑骨架,有效抑制了VN和Ni纳米粒子团聚的发生,使复合材料的循环稳定性显著增强。由于Ni纳米粒子和氮掺杂碳纳米片优异的导电性以及VN纳米粒子较高的比容量,使得Ni/VN/NC复合电极材料表现出较高的比容量,良好的导电性和倍率性能。此外,我们组装的3-Ni/VN/NCs-7//CuCo₂O₄非对称超级电容器和3-Ni/VN/NCs-7对称超级电容器,均展现出优异的电化学性能。更多还原

【Abstract】 As a class of emerging anode material, much attention has been dominated to vanadium nitride(VN) in view of its high specific capacitance, exceptional electrical conductivity and proper operating potential window [1]. Using VCl4 as vanadium source, Kumta et al. prepared the VN nanocrystals by ammonia reduction method, and exhibited a specific capacitance of 1340 F g-1 at a scan rate of 2 m V s-1 [2]. However, it shows poor cycling stability in alkaline electrolyte due to the existence of oxide layer(VOx) on the surface of VN, which seriously hinders the practical application of VN as an electrode material for supercapacitors(SCs) [3]. In this work, Ni/VN/NC nanocomposites were synthesized by a facile one-step method. Ultra-mall Ni nanoparticles and VN nanoparticles were embedded into nitrogen-doped carbon(NC) nanosheets as negative electrode materials for SCs. As a supporting skeleton, NC nanosheets can effectively prevent the VN and Ni nanoparticles from agglomeration and enhance the cycling stability of the nanocomposites. The Ni/VN/NC electrode materials show good specific capacitance, conductivity and rate capability due to the excellent conductivity of Ni nanoparticles and N-doped carbon nanoparticles as well as the high specific capacitance of VN nanoparticles. In addition, as the 3-Ni/VN/NCs-7//CuCo2 O4 asymmetric supercapacitor and 3-Ni/VN/NCs-7 symmetric supercapacitor were assembled respectively, excellent electrochemical performances were obtained.更多还原