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首页> 外文期刊>Applied Surface Science >Solvothermal-derived nanoscale spinel bimetallic oxide particles rationally bridged with conductive vapor-grown carbon fibers for hybrid supercapacitors
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Solvothermal-derived nanoscale spinel bimetallic oxide particles rationally bridged with conductive vapor-grown carbon fibers for hybrid supercapacitors

机译：溶剂热源型纳米级尖晶石双金属氧化物颗粒具有用于杂交超级电容器的导电气相生长碳纤维的理性桥接

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摘要

Recently, bimetallic oxides with nanoscale morphology have emerged as promising and reliable electrode candidates for supercapacitors. Herein, we synthesized MnCo2O4 nanoparticles (NPs) (= 100 nm) via a facile one-step solvothermal method without further calcination. Thanks to the multi-valence states of manganese and cobalt elements as well as the structural characteristics of NPs, the MnCo2O4 NPs material delivered a maximum capacity of 44.8 mAh g(-1) at a current density of 2 A g(-1) in alkaline electrolyte. To improve the electrical conductivity and electrokinetics, vapor-grown carbon fibers (VCFs) were introduced into the MnCo2O4 (VCFs@MnCo2O4) material. Here, the VCFs connected to NPs can act as conductive bridges among the MnCo2O4 NPs and also transfer the generated charge promptly to the current collector. Consequently, the VCFs@MnCo2O4 composite demonstrated a higher specific capacity of 48.4 mAh g(-1) (at 2 A g(-1)) than solitary MnCo2O4. Besides, the VCFs@MnCo2O4 composite demonstrated excellent cycling stability without degradation even after 2000 and 10000 charge-discharge cycles. Furthermore, the hybrid supercapacitor (HSC) was fabricated with VCFs@MnCo2O4 as a cathode and activated carbon as an anode, which showed a good specific capacitance of 63.8 F g(-1) (2 mA cm(-2)). Also, this HSC device exhibited a considerable energy density of 20.6 Wh kg(-1) and a power density of 2251.5 W kg(-1). The efficiency of HSC was also tested by driving electronic components.
机译：最近，具有纳米级形态的双金属氧化物已经成为超级电容器的有前途和可靠的电极候选者。在此，我们通过容易的单步溶液方法合成MNCO2O4纳米颗粒（NPS）（NPS）（NPS）（＆ = 100nm），无需进一步煅烧。由于锰和钴元件的多价态以及NPS的结构特征，MNCO2O4 NPS材料以2Ag（-1）的电流密度提供了44.8mahg（-1）的最大容量碱性电解质。为了改善导电性和电动性，将气化碳纤维（VCFS）引入MNCO2O4（VCFS @ MNCO2O4）材料中。这里，连接到NPS的VCF可以用作MNCO2O4 NP之间的导电桥，并且还将产生的电荷迅速转移到集电器。因此，VCFS @ MNCO2O4复合材料显示出48.4mAhg（-1）的比特定容量（以2Ag（-1）），而不是孤酸均匀的mnCo2O4。此外，即使在2000和10000充放电循环之后，VCFS @ MNCO2O4 Composite也显示出优异的循环稳定性而不会降解。此外，用VCFS @ MNCO2O4制备杂化超级电容器（HSC）作为阴极和作为阳极的活性炭，其显示出63.8fg（-1）的良好比电容（2 mA cm（-2））。而且，该HSC器件具有相当大的能量密度为20.6WH kg（-1）和2251.5W kg（-1）的功率密度。通过驾驶电子元件测试HSC的效率。

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