NiO nanoflakes anchored on carbon nanotubes (CNTs) were fabricated through a H₂O₂-assisted microwave irradiation method. The formation of the NiO/CNT nanocomposites were characterised by powder X-ray diffraction (PXRD), Fourier transform infrared spectroscopy (FT-IR), micro Raman spectroscopy and X-ray photoelectron spectroscopy. Surface morphology studies of the prepared materials were carried out using scanning and transmission electron microscopy (SEM and TEM). The electrochemical performance of the NiO and NiO/CNTs were analysed by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) techniques. GCD studies of the NiO/CNTs reveal a maximum specific capacitance of 258 F/g at 1 A/g current density in 2 M KOH aqueous electrolyte was achieved for 1:1 ratio of NiO/CNTs composite. Further, a specific capacitance of 258 F/g at 1 A/g current density obtained for 1:1 ratio of NiO/CNTs is almost 2.15 times higher than that of prepared NiO (120 F/g) which indicates an excellent synergistic effect in NiO/CNTs nanocomposite. Furthermore, the NiO/CNTs nanocomposite electrode showed outstanding cycling stability retention of 86% of the initial capacitance after 2500 cycles.

Graphical abstract

中文翻译：

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H 2 O 2辅助微波合成超级电容器应用NiO / CNT纳米复合材料

通过H ₂ O ₂制备了锚固在碳纳米管（CNT）上的NiO纳米薄片。辅助微波辐射法。NiO / CNT纳米复合材料的形成通过粉末X射线衍射（PXRD），傅立叶变换红外光谱（FT-IR），显微拉曼光谱和X射线光电子能谱进行了表征。使用扫描和透射电子显微镜（SEM和TEM）对所制备材料的表面形态进行研究。通过循环伏安法（CV），恒电流充放电（GCD）和电化学阻抗谱（EIS）技术分析了NiO和NiO / CNT的电化学性能。NiO / CNTs的GCD研究表明，当NiO / CNTs比例为1：1时，在2 M KOH水性电解质中，电流密度为1 A / g时，最大比电容为258 F / g。此外，对于1，在1 A / g的电流密度下获得的比电容为258 F / g。NiO / CNTs的1比率几乎比制备的NiO（120 F / g）高2.15倍，这表明在NiO / CNTs纳米复合材料中具有优异的协同作用。此外，NiO / CNTs纳米复合电极在2500次循环后显示出出色的循环稳定性，保持了初始电容的86％。

图形概要