School of Materials Science and Engineering, North Minzu University, Yinchuan 750021, PR China.
School of Materials Science and Engineering, North Minzu University, Yinchuan 750021, PR China.
J Colloid Interface Sci. 2019 Mar 1;537:50-56. doi: 10.1016/j.jcis.2018.11.002. Epub 2018 Nov 3.
Layered hexagonal Ni(OH) nanoflakes have been successfully fabricated on the surface of reduce graphite oxide (rGO) via nickel induced in situ growth in this study. The layers number and size of Ni(OH) nanoflakes could be controlled by adjusting the concentration of Ni precursors with nickel as active site on rGO surface. In the three electrode systems, the composite showed a relatively high specific capacitance achieved 1012.2 F∙g at current density of 1 A∙g with coulombic efficiency of 98.3%. As assembled in asymmetric devices (Ni(OH) nanoflakes loaded on rGO as positive electrode and active carbon as negative electrode), the maximum specific capacitance reaches to 260.9 F∙g at current density of 0.5 A∙g and the energy density can be maintained at 71.1 Wh∙kg at power density of 26.95 kW∙kg with good rate capability and acceptable cycling stability.
本研究通过镍诱导的原位生长，成功地在还原氧化石墨(rGO)表面制备了层状六方 Ni(OH)纳米薄片。通过调节 Ni 前体的浓度，可以控制 Ni(OH)纳米薄片的层数和尺寸，镍作为 rGO 表面的活性位。在三电极系统中，该复合材料在电流密度为 1 A·g 时表现出较高的比电容，达到 1012.2 F·g，库仑效率为 98.3%。在组装的非对称器件中（Ni(OH)纳米薄片负载在 rGO 上作为正极，活性炭作为负极），在电流密度为 0.5 A·g 时最大比电容可达 260.9 F·g，在功率密度为 26.95 kW·kg 时能量密度可保持在 71.1 Wh·kg，具有良好的倍率性能和可接受的循环稳定性。
