Carbon supported manganese(IV)–cobalt(II/III) oxides nanoparticles for high-performance electrochemical supercapacitors

IF 0.5 4区 化学 Q4 CHEMISTRY, MULTIDISCIPLINARY Chemija Pub Date : 2020-04-21 DOI:10.6001/chemija.v31i2.4220
J. Jablonskienė, D. Šimkūnaitė, J. Vaičiūnienė, G. Stalnionis, A. Drabavičius, L. Tamašauskaitė-Tamašiūnaitė, E. Norkus
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Abstract

Center for Physical Sciences and Technology, 3 Saulėtekio Avenue, 10257 Vilnius, Lithuania The carbon supported manganese(IV)–cobalt (II/III) oxides nanoparticles labelled as MnO2–Co3O4/C nanocomposites have been prepared by a simple one-step microwave-assisted heating method using different precursor materials. Scanning electron microscopy (SEM), transmission electron microscopy (TEM) and inductively coupled plasma optical emission spectroscopy (ICP-OES) have been used for the characterization of morphology, structure and composition of the synthesized nanocomposites, whereas the electrochemical performance of the prepared nanocomposites has been evaluated by using cyclic voltammetry (CV). It was determined that the use of different precursor materials for the synthesis of the carbon supported MnO2 and Co3O4 nanocomposites results in a different morphology of the prepared substances. A high specific capacitance (Cs) of 658.8 F g −1 at a scan rate of 10 mV s−1 in a 1 M Na2SO4 solution has been obtained for the MnO2– Co3O4/C-2 nanocomposite that has a spherical shape of nanoparticles. Moreover, it significantly outperforms the MnO2–Co3O4/C-1 nanocomposite that has a lamellar shape of nanoparticles.
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用于高性能电化学超级电容器的碳负载锰(IV)-钴(II/III)氧化物纳米颗粒
立陶宛维尔纽斯Saulïtekio大道3号物理科学与技术中心,10257。通过使用不同的前体材料,通过简单的一步微波辅助加热方法制备了标记为MnO2–Co3O4/C纳米复合材料的碳负载锰(IV)–钴(II/III)氧化物纳米颗粒。扫描电子显微镜(SEM)、透射电子显微镜(TEM)和电感耦合等离子体发射光谱(ICP-OES)已用于表征合成的纳米复合材料的形态、结构和组成,而使用循环伏安法(CV)评估了制备的纳米复合材料的电化学性能。已经确定,使用不同的前体材料来合成碳负载的MnO2和Co3O4纳米复合材料导致所制备的物质的不同形态。对于具有球形纳米颗粒的MnO2–Co3O4/C-2纳米复合材料,在1M Na2SO4溶液中以10 mV s−1的扫描速率获得了658.8 F g−1的高比电容(Cs)。此外,它显著优于具有纳米颗粒片状形状的MnO2–Co3O4/C-1纳米复合材料。
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来源期刊
Chemija
Chemija 化学-化学综合
CiteScore
1.30
自引率
16.70%
发文量
14
审稿时长
>12 weeks
期刊介绍: Chemija publishes original research articles and reviews from all branches of modern chemistry, including physical, inorganic, analytical, organic, polymer chemistry, electrochemistry, and multidisciplinary approaches.
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