Different orientations of multilayered Ni(OH)₂ nanoflakes uniformly anchored on reduced graphene oxide (rGO) sheets are prepared by a facile chemical deposition method. It is found that vertically oriented Ni(OH)₂/rGO has a greater specific capacitance than the horizontally oriented counterpart. The electrochemical performance of as-fabricated vertically oriented Ni(OH)₂/rGO composite as cathode material for supercapacitors shows an unexceptionable specific capacitance along with high rate capability and cycling stability. As a result, the specific capacitance reaches 1770 F/g at a current density of 1 A/g in 6 M KOH solution. Furthermore, the Ni(OH)₂/rGO electrode displays an ultrahigh rate capability (maintaining 864 F/g at a high current density of 50 A/g) and a super cycling stability (142.2% capacity retention after 3000 charge-discharge cycles). Such an orientation-controlled Ni(OH)₂/rGO composite is thus a promising electrode material for great applications in energy storage systems.

通过一种简便的化学沉积方法，制备了均匀固定在还原氧化石墨烯（rGO）片上的多层Ni（OH）₂纳米薄片的不同取向。发现垂直取向的Ni（OH）₂ / rGO具有比水平取向的对应物更大的比电容。制成的垂直取向Ni（OH）₂ / rGO复合材料作为超级电容器阴极材料的电化学性能显示出无与伦比的比电容以及高倍率性能和循环稳定性。结果，在6M KOH溶液中，在1A / g的电流密度下，比电容达到1770F / g。此外，Ni（OH）₂/ rGO电极显示出超高倍率能力（在50 A / g的高电流密度下保持864 F / g）和超级循环稳定性（3000次充放电循环后容量保持率达到142.2％）。因此，这种取向控制的Ni（OH）₂ / rGO复合材料是用于储能系统中的大量应用的有前途的电极材料。