College of Science, Northwest A&F University, Yangling, Shaanxi, China.
College of Science, Northwest A&F University, Yangling, Shaanxi, China.
J Colloid Interface Sci. 2016 Oct 15;480:57-62. doi: 10.1016/j.jcis.2016.07.001. Epub 2016 Jul 1.
Nickel-Aluminum Layered Double Hydroxide (NiAl-LDH) and nanocomposite of Carbon Nanotubes (CNTs) and NiAl-LDH (CNTs/NiAl-LDH) were prepared by using a facile one-step homogeneous precipitation approach. The morphology, structure and electrochemical properties of the as-prepared CNTs/NiAl-LDH nanocomposite were then systematically studied. According to the galvanostatic charge-discharge curves, the CNTs/NiAl-LDH nanocomposite exhibited a high specific capacitance of 694Fg(-1) at the 1Ag(-1). Furthermore, the specific capacitance of the CNTs/NiAl-LDH nanocomposite still retained 87% when the current density was increased from 1 to 10Ag(-1). These results indicated that the CNTs/NiAl-LDH nanocomposite displayed a higher specific capacitance and rate capability than pure NiAl-LDH. And the participation of CNTs in the NiAl-LDH composite improved the electrochemical properties. Additionally, the capacitance of the CNTs/NiAl-LDH nanocomposite kept at least 92% after 3000cycles at 20Ag(-1), suggesting that the nanocomposite exhibited excellent cycling durability. This strategy provided a facile and effective approach for the synthesis of nanocomposite based on CNTs and NiAl-LDH with enhanced supercapacitor behaviors, which can be potentially applied in energy storage conversion devices.
镍-铝层状双氢氧化物（NiAl-LDH）和碳纳米管（CNTs）与 NiAl-LDH 的纳米复合材料（CNTs/NiAl-LDH）通过简便的一步均相沉淀法制备。然后系统地研究了所制备的 CNTs/NiAl-LDH 纳米复合材料的形态、结构和电化学性能。根据恒电流充放电曲线，CNTs/NiAl-LDH 纳米复合材料在 1Ag-1 时表现出 694Fg-1 的高比电容。此外，当电流密度从 1 增加到 10Ag-1 时，CNTs/NiAl-LDH 纳米复合材料的比电容仍保留 87%。这些结果表明，与纯 NiAl-LDH 相比，CNTs/NiAl-LDH 纳米复合材料具有更高的比电容和倍率性能。并且 CNTs 的参与提高了 NiAl-LDH 复合材料的电化学性能。此外，在 20Ag-1 下循环 3000 次后，CNTs/NiAl-LDH 纳米复合材料的电容保持至少 92%，表明该纳米复合材料具有优异的循环耐久性。该策略为基于 CNTs 和 NiAl-LDH 的纳米复合材料的合成提供了一种简便有效的方法，增强了超级电容器的性能，有望应用于储能转换器件。
