Youssry Sally M, Abd Elkodous M, Kawamura Go, Matsuda Atsunori
Department of Chemistry, Faculty of Science, Tanta University Tanta 31527 Egypt.
Department of Electrical and Electronic Information Engineering, Toyohashi University of Technology 1-1 Hibarigaoka, Tempaku-cho Toyohashi Aichi 441-8580 Japan
RSC Adv. 2021 Dec 13;11(63):39636-39645. doi: 10.1039/d1ra08045h.
Naturally, a combination of metal oxides and carbon materials enhances the electrochemical performance of supercapacitor (SC) electrodes. We report on two different materials with highly conductive carbon dots (CDs) and a CoNiFeO/SiO/TiO nanocomposite with a high power density, a high specific surface area, and a nanoporous structure to improve power and energy density in energy storage devices. A simple and low-cost process for synthesizing the hybrid SC electrode material CoNiFeO/SiO/TiO/CDs, known as CDs-nanocomposite, was performed a layer-by-layer method; then, the CDs-nanocomposite was loaded on a nickel foam substrate for SC electrochemical measurements. A comparative study of the surface and morphology of CDs, the CoNiFeO/SiO/TiO nanocomposite and CDs-nanocomposite was carried out using X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), BET surface area, and Raman spectroscopy. The synthesized CDs-nanocomposite electrode material displayed enhanced electrochemical performance, having a high specific capacitance of 913.7 F g at a scan rate of 5 mV s and capacitance retention of 72.2%, as well as remarkable long-life cyclic stability over 3000 cycles in the three-electrode setup and 1 M KOH electrolyte. It also demonstrated a superior energy density of 130.7 W h kg. The improved electrochemical behavior of the CDs-nanocomposite for SC electrodes, together with its fast and simple synthesis method, provides a suitable point of reference. Other kinds of metal oxide nanocomposites can be synthesized for use in energy storage devices.
自然地，金属氧化物和碳材料的组合可增强超级电容器（SC）电极的电化学性能。我们报道了两种不同的材料，一种是具有高导电性的碳点（CDs），另一种是具有高功率密度、高比表面积和纳米多孔结构的CoNiFeO/SiO/TiO纳米复合材料，以提高储能装置的功率和能量密度。采用逐层法进行了一种简单且低成本的合成混合SC电极材料CoNiFeO/SiO/TiO/CDs（即CDs-纳米复合材料）的工艺；然后，将CDs-纳米复合材料负载在泡沫镍基底上进行SC电化学测量。使用X射线衍射（XRD）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、能量色散X射线光谱（EDX）、BET比表面积和拉曼光谱对CDs、CoNiFeO/SiO/TiO纳米复合材料和CDs-纳米复合材料的表面和形态进行了对比研究。合成的CDs-纳米复合材料电极材料表现出增强的电化学性能，在扫描速率为5 mV s时具有913.7 F g的高比电容和72.2%的电容保持率，以及在三电极装置和1 M KOH电解液中超过3000次循环的显著长寿命循环稳定性。它还展示了130.7 W h kg的优异能量密度。CDs-纳米复合材料用于SC电极时电化学行为的改善，连同其快速简单的合成方法，提供了一个合适的参考点。可以合成其他种类的金属氧化物纳米复合材料用于储能装置。
