State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and Department of Materials Science and Engineering, Zhejiang University , Hangzhou 310027, China.
ACS Appl Mater Interfaces. 2013 Sep 11;5(17):8790-5. doi: 10.1021/am402681m. Epub 2013 Aug 26.
Hierarchical NiCo2O4@NiCo2O4 core/shell nanoflake arrays on nickel foam for high-performance supercapacitors are fabricated by a two-step solution-based method which involves in hydrothermal process and chemical bath deposition. Compared with the bare NiCo2O4 nanoflake arrays, the core/shell electrode displays better pseudocapacitive behaviors in 2 M KOH, which exhibits high areal specific capacitances of 1.55 F cm(-2) at 2 mA cm(-2) and 1.16 F cm(-2) at 40 mA cm(-2) before activation as well as excellent cycling stability. The specific capacitance can achieve a maximum of 2.20 F cm(-2) at a current density of 5 mA cm(-2), which can still retain 2.17 F cm(-2) (98.6% retention) after 4000 cycles. The enhanced pseudocapacitive performances are mainly attributed to its unique core/shell structure, which provides fast ion and electron transfer, a large number of active sites, and good strain accommodation.
在泡沫镍上制备了具有分层 NiCo2O4@NiCo2O4 核/壳纳米片阵列的高性能超级电容器，这是通过两步基于溶液的方法实现的，该方法包括水热过程和化学浴沉积。与裸 NiCo2O4 纳米片阵列相比，核/壳电极在 2 M KOH 中表现出更好的赝电容行为，在激活前具有 2 mA cm(-2)时 1.55 F cm(-2)和 40 mA cm(-2)时 1.16 F cm(-2)的高比面积比电容，以及出色的循环稳定性。在电流密度为 5 mA cm(-2)时，比电容可达到最大值 2.20 F cm(-2)，经过 4000 次循环后仍可保持 2.17 F cm(-2)(98.6%的保持率)。增强的赝电容性能主要归因于其独特的核/壳结构，该结构提供了快速的离子和电子转移、大量的活性位点和良好的应变容限。
