Abstract
Nanocrystalline vanadium nitride (VN) materials were synthesized by high temperature ammonia (NH3) reduction of vanadium oxide (V2O5). The structure and morphology of VN materials were characterized by XRD，SEM and TEM, while the specific surface area, pore size distribution and supercapacitive behavior by N2 absorption, cyclic voltammetry (CV) and constant current charge-discharge measurements in 1 mol?L-1 KOH electrolyte. The results showed that the VN sample belonged to the cubic crystal system (Fm3m [225])，and had homogeneous surface and appeared nearly spherical with uniform size. As the reaction time was extended to 12 h，small particles were interconnected with each other to form some mesopores. The specific capacitance of VN-c was 192 F.g-1 at current density of 50 mA.g-1，and retained 150 F.g-1 after 1000 cycles. The VN sample possessed both capacitive properties of electrical double-layer and pseudocapacitive properties of redox reactions.
Graphical Abstract
Keywords
electrochemical capacitor, nanocrystalline vanadium nitride, negative electrode materials, specific surface area, specific capacitance
Publication Date
2013-04-28
Online Available Date
2012-04-29
Revised Date
2012-04-19
Received Date
2012-03-12
Recommended Citation
Zhao-hui GAO, Hao ZHANG, Gao-ping CAO, Min-fang HAN, Yu-sheng YANG.
Performance of VN as Negative Electrode Materials in Electrochemical Capacitors[J]. Journal of Electrochemistry,
2013
,
19(2): Article 18.
DOI: 10.61558/2993-074X.2947
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol19/iss2/18
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