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Facile synthesis of NiCoMnO4 nanoparticles as novel electrode materials for high-performance asymmetric energy storage devices

机译：NiCoMnO4纳米粒子的便捷合成，作为高性能非对称储能器件的新型电极材料

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In attempt to reduce the amount of toxic Co in cobalt oxides, NiCoMnO4 nanoparticles were synthesized via a facile hydrothermal route and their electrochemical properties have been investigated as a novel electrode material for supercapacitors. Samples have been characterized using X-ray diffraction (XRD), energy dispersive X-ray analysis (EDAX), and X-ray photoelectron spectroscopy (XPS). N-2 adsorption/desorption measurements demonstrated a high specific surface area of 175 m(2) g(-1). The morphology of the samples has been probed with scanning (SEM) and transmission (TEM) electron microscopy. The electrochemical properties of the NiCoMnO4 nanoparticles have been evaluated as electrode materials for energy storage application by means of various electrochemical techniques including cyclic voltammetry, galvanostatic charge-discharge measurements, and electrochemical impedance spectroscopy. According to the obtained results, the NiCoMnO4 electrodes showed significant improved capacitive performance in comparison with pure oxides (e. g. NiO, Co3O4, and Mn3O4). The NiCoMnO4 electrodes with a high mass loading of similar to 10 mg cm(-2) exhibited a high specific capacitance of 510 F g(-1) at 1 A g(-1), and a desirable rate capability (retaining 285 F g(-1) at 10 A g(-1)). Finally, asymmetric devices based on NiCoMnO4 nanoparticles as positive electrodes and reduced graphene oxide nanosheets as negative electrodes were assembled, showing a remarkable performance including high energy (20 W h kg(-1)), and stunning power density (37.5 kW kg(-1)).
机译：为了减少氧化钴中有毒Co的含量，通过一种简便的水热途径合成了NiCoMnO4纳米颗粒，并对其电化学性能进行了研究，作为超级电容器的新型电极材料。使用X射线衍射（XRD），能量色散X射线分析（EDAX）和X射线光电子能谱（XPS）对样品进行了表征。 N-2吸附/解吸测量表明高比表面积175 m（2）g（-1）。样品的形态已通过扫描（SEM）和透射（TEM）电子显微镜进行了探测。通过各种电化学技术，包括循环伏安法，恒电流充放电测量和电化学阻抗谱，已评估了NiCoMnO4纳米颗粒的电化学性能作为储能应用的电极材料。根据获得的结果，与纯氧化物（例如，NiO，Co 3 O 4和Mn 3 O 4）相比，NiCoMnO 4电极显示出显着改善的电容性能。具有类似于10 mg cm（-2）的高质量负载的NiCoMnO4电极在1 A g（-1）时表现出510 F g（-1）的高比电容，并具有理想的倍率能力（保持285 F g （-1）在10 A g（-1）时）。最终，组装了以NiCoMnO4纳米粒子为正极和以氧化石墨烯纳米片为负极的不对称器件，显示出非凡的性能，包括高能量（20 W h kg（-1））和惊人的功率密度（37.5 kW kg（-） 1））。

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