【作者】 程福奎； 陈红雨； 舒东； 文萃； 彭亮波；

【Author】 Cheng Fukui~1,Chen Hongyu~(1,2),Shu Dong~(1,2*),Wen Cui~1,Peng Liangbo~1 1 School of Chemistry and Environment,South China Normal University,Guangzhou,Guangdong 510006, PR China 2 Key Lab of Technology on Electrochemical Energy Storage and Power Generation in Guangdong Universities,Guangzhou,Guangdong 510006,PR China

【机构】 华南师范大学化学与环境学院； 广东高校电化学储能与发电技术重点实验室；

【摘要】 氮化钒（VN）兼具有好的电导性和钒的多价态,有望成为一种优良的新型超级电容器电极材料,而小粒径、高比表面积的VN纳米晶有助于提高其电化学性能。以三聚氰胺（melamine）作为氮源和V₂O₅干凝胶在氮气保护气氛中制得了VN纳米粉体,并对其物相结构和电化学性能进行了表征。在1Ag^-1电流密度下进行充放电测试,获得的最高比容量为265 F g^-1;与0.25 A g^-1电流密度相比,将电流密度增加8倍至4 A g^-1进行充放电,其比容量保持率为82.4%。在30 mV s^-1扫速下1000次循环后,比容量保持率为41%。更多还原

【Abstract】 Vanadium Nitride（VN） exhibits good electronic conductivity and combines with the variety of oxidation states exhibited by V in vanadium oxides can lay the foundation for a new class of high-performance supercapacitors.The nanometer size and high surface area of the nanocrystalline vanadium nitrides provide more redox-reaction sites,which conduces to improve it’s electrochemical performance.The nanocrystalline VN was synthesized by calcining the mixture of melamine and V₂O₅ xerogel in a furnace under an N₂ atmosphere at 800℃.The specific capacitance of VNis 265 F g^-1 at 1A g^-1.Furthermore,the specific capacitance remains 82.4%of the original value when the current increases from 0.25 to 4 A g^-1.It is regretful that the cicle life of the VN electrode is short(59%capacity loss after 1000 charge/discharge cycles at a scan rate of 30 mV s^-1).更多还原