Here in, for the first time, we report a new and simple procedure for preparing reduced graphene oxide/nickel-cobalt double layered hydroxide composite on the nickel foam (Ni-Co LDH/rGO/NF) via a fast and simple two-step electrochemical method including potentiostatic routes in the presence of CTAB as a cationic surfactant. Graphene oxide coated nickel foam prepared by simple immersion method. After that, the prepared electrode reduced electrochemically to obtain rGO/NF electrode. Finally, the rGO/NF electrode was used as cathode for electrodeposition of Ni-Co LDH in the presence of CTAB as cationic surfactant. The prepared electrodes were characterized by field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), x-ray diffraction (XRD), fourier transform infrared spectroscopy (FTIR), Energy-dispersive X-ray spectroscopy (EDS), Brunauer, Emmett and Teller (BET) and electrochemical techniques such as voltammetry (CV), galvanostatic charge-discharge curves (GCD) and electrochemical impedance spectroscopy (EIS). The resulting electrode which prepared in the presence of CTAB afforded extremely high specific capacitance of 2133.3 F g⁻¹ at a current density of 4 A g⁻¹. FE-SEM, TEM and EDS mapping results showed that Ni-Co LDH nanosheets uniformly covered the surface of rGO/NF in the presence of CTAB, and is closely packed and thinner in thickness compared with the sample prepared in similar way without using surfactant. Such new thin and dense morphology facilitates electrolyte ions diffusion through the prepared electrode. A good cycling stability was obtained for the electrode in alkaline media. EIS measurements showed low values of internal resistance (R_s) and charge transfer resistance (R_ct), indicating that the prepared nanocomposite is a promising candidate for supercapacitor applications. The asymmetric supercapacitor (ASC) based on the Ni-Co LDH/CTAB/rGO/NF as a positive electrode and rGO/NF as a negative electrode was assembled and it exhibited a C_s of 71.4 F g⁻¹ at a current density of 2 A/g and correspondingly energy density of as high as 68 Wh kg⁻¹.

在这里，我们首次报告了一种新的，简单的过程，该过程可通过快速，简单的两步操作在镍泡沫（Ni-Co LDH / rGO / NF）上制备还原型氧化石墨烯/镍-钴双层氢氧化物复合材料电化学方法，包括在CTAB作为阳离子表面活性剂存在下的恒电位途径。通过简单的浸渍方法制备的氧化石墨烯涂层的镍泡沫。之后，将制备的电极进行电化学还原，得到rGO / NF电极。最后，在CTAB作为阳离子表面活性剂的存在下，将rGO / NF电极用作Ni-Co LDH的电沉积阴极。制备的电极通过场发射扫描电子显微镜（FE-SEM），透射电子显微镜（TEM），X射线衍射（XRD），傅立叶变换红外光谱（FTIR）进行表征，能量色散X射线光谱仪（EDS），布鲁瑙尔（Brunauer），埃米特（Emmett）和特勒（Teller）和电化学技术，例如伏安法（CV），恒电流充放电曲线（GCD）和电化学阻抗谱（EIS）。在CTAB存在下制备的所得电极具有2133.3 F g的极高比电容^-1在4 A G的电流密度^-1。FE-SEM，TEM和EDS的图谱结果表明，与不使用表面活性剂的类似方法制备的样品相比，在CTAB存在下，Ni-Co LDH纳米片均匀地覆盖了rGO / NF的表面。这种新的薄而致密的形态有助于电解质离子扩散通过所制备的电极。在碱性介质中，电极具有良好的循环稳定性。EIS测量显示出较低的内部电阻（R _s）和电荷转移电阻（R _ct），表明制备的纳米复合材料是超级电容器应用的有希望的候选者。组装了以Ni-Co LDH / CTAB / rGO / NF为正电极和rGO / NF为负电极的不对称超级电容器（ASC），在电流密度为时，其C _s为71.4 F g ^-1。 2 A / g和相应的能量密度高达68 Wh kg ^-1。