超级电容器
纳米复合材料
材料科学
阳极
结晶度
X射线光电子能谱
电化学
化学工程
电容
物理吸附
电极
纳米技术
复合材料
化学
有机化学
物理化学
吸附
工程类
作者
Heba M. El Sharkawy,Aya M. Mohamed,Nageh K. Allam
标识
DOI:10.1016/j.electacta.2023.143368
摘要
The performance of supercapacitor devices is mainly limited by the ability to identify anode materials with fair stability and activity. Herein, we demonstrate the efficient synthesis of V2O5@MnO2 nanocomposites. The XRD, XPS, EDS, FESEM, and N2-physisorption techniques are carried out to clarify the crystallinity, elemental composition, morphology, and surface structure associated with the V2O5@MnO2 nanocomposites. Upon use as negative electrodes in supercapacitor devices, the fabricated V2O5@MnO2 nanocomposite displayed excellent specific capacitance over an outstanding operating voltage window (0 to -1 V). Moreover, the constructed symmetric supercapacitor (V2O5@MnO2//V2O5@MnO2) device revealed ultrahigh specific energy (Es) of 69 Wh kg−1 with 1200 W kg−1 under 1.5 A g–1, and an exceptional cell potential of 1.6 V (almost equal to that of an asymmetric device) with remarkable cycling stability. The device retains an exceptional efficiency (∼100 %) over 32,000 consecutive galvanostatic charging/discharging (GCD) cycles. These findings demonstrate the ability of the synthesized nanocomposite for use as viable negative/positive material for high performance devices.
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