对共沉淀法（简称Co 3 O 4 -C）和水热法（简称Co 3 O 4 -H）合成的两种不同形貌的Co 3 O 4纳米晶粉末的超电容性能进行了比较和研究。分析样品的相纯度、晶体结构、表面形态和表面积。发现这两个样品都是单相纳米结构，具有正常的尖晶石型立方晶体结构（空间群FD3￣米），如拉曼和 XRD（X 射线衍射）数据分析所示。TEM（透射电子显微镜）图像清楚地显示Co 3 O 4 –C 样品呈现出平均尺寸为10 nm 的球形颗粒。另一方面，Co 3 O 4 –H 样品显示出花状的颗粒集合体。Co 3 O 4 -C 样品由于其较小的粒径而比Co 3 O 4 -H 样品具有更高的比表面积。收集XPS（X射线光电子能谱）数据来分析样品的化学态和阳离子分布，显示Co 3+和Co 2+的比例为2:1在两个样本中。两个样品在 CV（循环伏安法）和 GCD（恒电流充放电）分析中均表现出赝电容行为。尽管具有较小的表面积，但当使用 1 M KOH 电解质进行测试时，在所有电流密度下， Co 3 O 4 -H 电极均表现出比 Co 3 O 4 -C 电极更高的 C S （比电容）。在特定电流密度（0.5 A/g）下，Co 3 O 4 –C 和 Co 3 O 4 –H的 Cs 值分别为 366 F/g 和 233 F/g。随着电流密度的增加，两个电极的比电容都会降低，但这种降低对于Co来说更为突出3 O 4 -C优于Co 3 O 4 -H。研究表明，除了表面积之外，样品的形态在确定材料的电容方面也起着至关重要的作用。

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The supercapacitive properties of Co3O4 nanocrystalline powders with two different morphologies synthesized by coprecipitation (referred to as Co3O4–C) and hydrothermal (referred to as Co3O4-H) methods were compared and studied. The samples were analyzed for their phase purity, crystal structure, surface morphology, and surface area. Both samples were found to be single-phase nanostructures with a normal spinel-type cubic crystal structure (space group Fd3¯m), as indicated by Raman and XRD (X-ray diffraction) data analyses. TEM (Transmission electron microscopy) images clearly show that the Co3O4–C sample exhibits spherical particles with a mean size of 10 nm. On the other hand, the Co3O4–H sample shows a flower-like assembly of particles. The Co3O4–C sample has a higher specific surface area than the Co3O4-H sample due to its smaller particle size. XPS (X-ray photoelectron spectroscopy) data were collected to analyze the chemical states and cation distribution of the samples, revealing a 2:1 ratio of Co3+ and Co2+ in both samples. Both samples displayed pseudocapacitive behaviour in CV (cyclic voltammetry) and GCD (galvanostatic charge–discharge) analyses. Despite having a smaller surface area, the Co3O4–H electrode exhibited a higher CS (specific capacitance) compared to the Co3O4–C electrode at all current densities when tested using 1 M KOH electrolyte. At a specific current density (0.5 A/g), the Cs values for Co3O4–C and Co3O4–H are found to be 366 F/g and 233 F/g, respectively. As the current density increases, the specific capacitance of both electrodes decreases, but this reduction is more prominent for Co3O4-C than Co3O4-H. The study indicates that besides surface area, the morphology of the sample also plays a crucial role in determining the capacitance of a material.