The effect of concentration on the charge storage of supercapacitors is one of the crucial parameters. In the current work, we have successfully deposited the ¹D–³D aggregate structure of the nickel oxide (NiO) with its various content concentration of the nickel nitrate precursor on stainless steel (SS) via the simplest hydrothermal technique. The influence of the molarities of the NiO on the nanostructures as well as electrochemically charge storage applications has been studied. The X-Ray diffraction (XRD), scanning electron microscopy (SEM), and FTIR were used for structural, and morphological analysis of the nickel oxide. Here, we observed the cubic structure with the Fm-3 m space group of NiO nanomaterials. SEM images depict the 1D-columnar flakes along with aggregate ¹D–³D morphology. The flakes like NiO nanomaterials exhibit a highly electrochemically charge storage pseudocapacitive nature. The optimized 0.40 M of NiO nanomaterial electrode shows the highest specific capacitance value is 639.3 Fg⁻¹ at 5 mVsec⁻¹ in aqueous 1 M KOH in an aqueous electrolyte. The observed maximum specific energy (SE) and specific power (SP) are 74.13 Whkg⁻¹ and 2.07 KWkg⁻¹. The optimized NiO//reduced Graphene Oxide (rGO) based asymmetric hybrid supercapacitor device (AsHSD) shows an excellent specific capacitance value is 34.8 Fg⁻¹ with the highest charging-discharging capability of 83 % up to 100 cycles.

浓度对超级电容器电荷存储的影响是关键参数之一。在目前的工作中，我们通过最简单的水热技术成功地将具有不同含量浓度的硝酸镍前体的氧化镍 (NiO) 的 1D-3D 聚集体结构沉积^在不锈钢⁽ SS) 上。已经研究了 NiO 的摩尔浓度对纳米结构以及电化学电荷存储应用的影响。X 射线衍射 (XRD)、扫描电子显微镜 (SEM) 和 FTIR 用于氧化镍的结构和形态分析。在这里，我们观察到 NiO 纳米材料具有 Fm-3 m 空间群的立方结构。SEM 图像描绘了 1D 柱状薄片和骨料¹维 - ³维形态。NiO纳米材料等薄片表现出高度电化学电荷存储赝电容性质。优化的 0.40 M NiO 纳米材料电极显示出最高比电容值为 639.3 Fg ^-1在 5 mVsec ^-1在含水电解质中的 1 M KOH 水溶液中。观察到的最大比能量（SE）和比功率（SP）为74.13 Whkg ^-1和2.07 KWkg ^-1。优化的基于 NiO//还原氧化石墨烯 (rGO) 的非对称混合超级电容器器件 (AsHSD) 显示出优异的比电容值为 34.8 Fg ^-1，最高充放电能力为 83%，最多 100 次循环。