Abstract This study presents the facile preparation of novel MnCo 2 O 4.5 microspindles (MSs) for the first time through a rapid solvothermal method combined with subsequent calcination of the precursor at 450 °C for 4 h in air. The MnCo 2 O 4.5 MSs have an average length of 4–5 µm and diameter of 2–4 µm, respectively, achieving a specific surface area as high as 83.3 m 2 g −1 . In addition, the size and morphology of the MnCo 2 O 4.5 microstructures could be easily tuned by some parameters including reaction time, volume ratio of ethanol to water, and dosage of urea. The electrochemical performance was further evaluated in three-electrode system, detailed electrochemical characterizations revealed that such MnCo 2 O 4.5 MSs exhibited both high specific capacitance of 343 F g −1 at a current density of 0.5 A g −1 and excellent cycling performance of 81.3% capacitance retention after 5000 cycles at a current density of 4 A g −1 in 2 M of KOH electrolyte, which made it a potential electrode material for an advanced supercapacitor. Furthermore, the present synthetic method is simple and can be extended to the synthesis of other electrode materials based on transition metal oxides.

中文翻译：

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溶剂热合成多孔MnCo2O4.5纺锤状微结构作为超级电容器的高性能电极材料

摘要 本研究首次通过快速溶剂热法结合前体在 450 °C 下在空气中煅烧 4 小时，轻松制备了新型 MnCo 2 O 4.5 微主轴 (MSs)。MnCo 2 O 4.5 MS 的平均长度分别为 4–5 µm 和直径为 2–4 µm，比表面积高达 83.3 m 2 g -1 。此外，MnCo 2 O 4.5 微观结构的尺寸和形态可以通过一些参数轻松调整，包括反应时间、乙醇与水的体积比和尿素剂量。在三电极系统中进一步评估了电化学性能，详细的电化学表征表明，这种 MnCo 2 O 4.5 MSs 在电流密度为 0 时表现出 343 F g -1 的高比电容。5 A g -1 和优异的循环性能，在 2 M KOH 电解质中以 4 A g -1 的电流密度循环 5000 次后电容保持率为 81.3%，这使其成为高级超级电容器的潜在电极材料。此外，本合成方法简单，可扩展到其他基于过渡金属氧化物的电极材料的合成。