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首页> 美国卫生研究院文献>ACS Omega >Hydrothermally Tailored Three-Dimensional Ni–VLayered Double Hydroxide Nanosheets as High-Performance Hybrid SupercapacitorApplications
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Hydrothermally Tailored Three-Dimensional Ni–VLayered Double Hydroxide Nanosheets as High-Performance Hybrid SupercapacitorApplications

机译：水热定制的三维镍钒合金层状双氢氧化物纳米片作为高性能混合超级电容器应用领域

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Here, we report a facile and easily scalable hydrothermal synthetic strategy to synthesize Ni–V layered double hydroxide (NiV LDH) nanosheets toward high-energy and high-power-density supercapacitor applications. NiV LDH nanosheets with varying Ni-to-V ratios were prepared. Three-dimensional curved nanosheets of Ni0.80V0.20 LDH showed better electrochemical performance compared to other synthesized NiV LDHs. The electrode coated with Ni0.80V0.20 LDH nanosheets in a three-electrode cell configuration showed excellent pseudocapacitive behavior, having a high specific capacity of 711 C g–1 (1581 F g–1) at a current density of 1 A g–1 in 2 M KOH. The material showed an excellent rate capability and retained the high specific capacity of 549 C g–1 (1220 F g–1) at a current density of 10 A g–1 and low internal resistances. Owing to its superior performance, Ni0.80V0.20 LDH nanosheets were used as positive electrode and commercial activated carbon was used as negative electrode for constructing a hybrid supercapacitor (HSC) device, having a working voltage of 1.5 V. The HSC device exhibited a high specific capacitance of 98 F g–1 at a current density of 1 A g–1. The HSC device showed a higher energy density of 30.6 Wh kg–1 at a power density of 0.78 kW kg–1 and maintained a high value of 24 Wh kg–1 when the power density was increased to 11.1 kW kg–1. The performance of NiV LDHs nanosheets indicates their great potentialas low-cost electrode material for future energy-storage devices.
机译：在这里，我们报告了一种简便且易于扩展的水热合成策略，可将Ni-V层状双氢氧化物（NiV LDH）纳米片合成为高能量和高功率密度的超级电容器应用。制备了具有不同的Ni-V比的NiV LDH纳米片。与其他合成的NiV LDH相比，Ni0.80V0.20 LDH的三维弯曲纳米片表现出更好的电化学性能。在三电极电池配置中，用Ni0.80V0.20 LDH纳米片涂覆的电极表现出优异的伪电容性能，具有711 C g -1 （1581 F g -1 ）在2 M KOH中的电流密度为1 A g –1 时。该材料表现出出色的倍率性能，并在电流密度为10 A g –1 （1220 F g –1 ）的高比容量。 > –1 和低内部电阻。由于其优异的性能，Ni0.80V0.20 LDH纳米片被用作正极，而商用活性炭被用作负极，以构建工作电压为1.5 V的混合超级电容器（HSC）器件。在1 A g -1 的电流密度下具有98 F g –1 的高比电容。 HSC设备在0.78 kW kg –1 的功率密度下显示出30.6 Wh kg –1 的更高能量密度，并保持了24 Wh kg 的高值。当功率密度增加到11.1 kW kg –1 时为–1 。 NiV LDHs纳米片的性能表明其巨大的潜力作为未来储能设备的低成本电极材料。

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