Department of Materials Science and Engineering, National University of Singapore , 117576 Singapore.
ACS Appl Mater Interfaces. 2013 Nov 13;5(21):10574-82. doi: 10.1021/am402436q. Epub 2013 Oct 18.
Pseudocapacitors based on fast surface Faradaic reactions can achieve high energy densities together with high power densities. Usually, researchers develop a thin layer of active materials to increase the energy density by enhancing the surface area; meanwhile, this sacrifices the mass loading. In this work, we developed a novel 3D core-shell Co3O4@Ni(OH)2 electrode that can provide high energy density with very high mass loading. Core-shell porous nanowires (Co3O4@Ni(OH)2) were directly grown on a Ni current collector as an integrated electrode/collector for the supercapacitor anode. This Co3O4@Ni(OH)2 core-shell nanoarchitectured electrode exhibits an ultrahigh areal capacitance of 15.83 F cm(-2). The asymmetric supercapacitor prototypes, assembled using Co3O4@Ni(OH)2 as the anode, reduced graphene oxide (RGO) or active carbon (AC) as the cathode, and 6 M aqueous KOH as the electrolyte, exhibit very high energy densities falling into the energy-density range of Li-ion batteries. Because of the large mass loading and high energy density, the prototypes can drive a minifan or light a bulb even though the size is very small. These results indicate that our asymmetric supercapacitors have outstanding potential in commercial applications. Systematic study and scientific understanding were carried out.
基于快速表面法拉第反应的赝电容器可以实现高能量密度和高功率密度。通常，研究人员开发出一层薄薄的活性材料，通过增加表面积来提高能量密度；同时，这也牺牲了质量负载。在这项工作中，我们开发了一种新型的 3D 核壳 Co3O4@Ni(OH)2 电极，它可以在非常高的质量负载下提供高能量密度。核壳多孔纳米线（Co3O4@Ni(OH)2）直接生长在 Ni 集流体上，作为超级电容器阳极的集成电极/集流体。这种 Co3O4@Ni(OH)2 核壳纳米结构电极表现出超高的比面积电容 15.83 F cm(-2)。使用 Co3O4@Ni(OH)2 作为阳极、还原氧化石墨烯（RGO）或活性炭（AC）作为阴极、6 M 水性 KOH 作为电解质组装的非对称超级电容器原型，具有非常高的能量密度，属于锂离子电池的能量密度范围。由于质量负载大、能量密度高，原型机甚至可以驱动微型风扇或点亮灯泡，尽管体积非常小。这些结果表明，我们的非对称超级电容器在商业应用中具有巨大的潜力。进行了系统的研究和科学理解。
