Abstract
In this paper, hydrothermal method was used to provide stable colloidal suspension of spherical carbon nanoparticles (CNPs) with good uniformity of size and shape. XRD analyses showed the formation of crystalline structure of carbon material. CNPs Raman spectrum indicates the high quality with a low content of structural defects and high graphitic degree. The formation of CNPs is confirmed by an absorption peak at 264 nm. XPS technique showed well a significant decrease of oxygen-containing functional groups, indicating a low degree of graphite oxidation. The active surface area of CNPs was measured by BET technique. TEM images show that CNPs are nearly spherical in shape and the diameters varying between 50 and 120 nm. The CV behaviors showed that CNPs exhibit the higher specific capacitance values, and is greatly improved over that of previously reported carbon nanomaterials.
Highlights
Carbon nanoparticles are black spherical particles with an average particle size of 50–100 nm and specific surface area of approximately 15–25 m2/g, are available in passivated, high purity, coated or dispersed forms; while, nanofluids are generally defined as suspended nanoparticles in solution either using surfactant or surface charge technology [1,2,3]
Carbon-based materials play a vital role in energy storage technology by providing high power and cycling performances and they are of interest because of their properties like high specific surface area [4, 5]
The peaks around 26.5° can be assigned to the (002) peak of graphite [22], The line broadening of X-ray diffraction peaks is primarily due to the small particle size of carbon nanoparticles (CNPs) [23]
Summary
Carbon nanoparticles are black spherical particles with an average particle size of 50–100 nm and specific surface area of approximately 15–25 m2/g, are available in passivated, high purity, coated or dispersed forms; while, nanofluids are generally defined as suspended nanoparticles in solution either using surfactant or surface charge technology [1,2,3]. Carbon-based materials play a vital role in energy storage technology by providing high power and cycling performances and they are of interest because of their properties like high specific surface area [4, 5]. CNPs possess a high electrically conductive and can exhibit a smaller iontransport resistance and a shorter diffusion pathway, leading to a higher specific capacitance at a large current density which candidate electrode material for high-performance supercapacitors [6]. The major objective is to synthesize abundant electrodes for supercapacitor with stable cycling performances, high conducting and low cost. The as-prepared colloidal suspension is composed of highly crystalline carbon presented as spherical nanoparticles
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