Solid-phase synthesis and electrochemical pseudo-capacitance of nitrogen-atom interstitial compound Co3N

被引:32
作者
Gao, Jian-Fei [1 ]
Zhang, Wei-Bin [1 ]
Zhao, Zhi-Yun [1 ]
Kong, Ling-Bin [1 ,2 ]
机构
[1] Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Gansu, Peoples R China
[2] Lanzhou Univ Technol, Sch Mat Sci & Engn, Lanzhou 730050, Gansu, Peoples R China
基金
中国国家自然科学基金;
关键词
GRAPHENE OXIDE NANOCOMPOSITE; TRANSITION-METAL NITRIDES; NICKEL COBALT SULFIDE; ONE-POT SYNTHESIS; MOLYBDENUM NITRIDE; THIN-FILMS; ASSISTED SYNTHESIS; ELECTRODE MATERIAL; MANGANESE OXIDE; ENERGY-STORAGE;
D O I
10.1039/c8se00009c
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Metal nitrides have great potential for electrochemical energy storage, but are relatively scarcely investigated. Herein, a novel metal nitride, Co3N, is prepared by nitridation using a Co3O4 precursor heated at 500 degrees C for 2 h in flowing NH3, and characterized by using X-ray diffraction (XRD), field emission-scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), selected area electron diffraction (SAED) and energy dispersive spectroscopy (EDS) methods. Besides, the electrochemical properties of Co3N are investigated using cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). The as-prepared Co3N demonstrates remarkable electrochemical performance with a high specific capacitance of 112.3 F g(-1) at a current density of 0.5 A g(-1), good rate capability (72.4%, from 0.5 to 5 A g(-1)) and superior cycling stability (109.7% retention over 10 000 cycles at a current density of 2 A g(-1)). Finally, a Co3N//activated carbon (AC) asymmetric supercapacitor (ASC) is successfully assembled by using Co3N and AC as the positive electrode and negative electrode, respectively. The as-fabricated ASC device can achieve a maximum energy density of 12.1 W h kg(-1) at a power density of 204.6 W kg(-1), which shows that the Co3N material should be a potential electrode material for supercapacitors.
引用
收藏
页码:1178 / 1188
页数:11
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