Hydrothermal synthesized porous Co(OH)_2 nanoflake film for supercapacitor application

• 来源期刊: 科学通报(英文版)
• 学科: 工学
• 年，卷（期）: 2012,（32）
• 页码范围: 4215-4219
• 页数: 5页
• 分类号: TM53
• 语种: 中文

摘要

Porous Co(OH)2 film directly grown on nickel foam is prepared by a facile hydrothermal method.The as-prepared Co(OH)2 film possesses a structure consisting of randomly porous nanoflakes with thicknesses of 20-30 nm.The capacitive behavior of the Co(OH)2 film is investigated by cyclic voltammograms and galvanostatic charge-discharge tests in 2 mol/L KOH.The porous Co(OH)2 film exhibits a high discharge capacitance of 935 F g-1 at a current density of 2 A g-1 and excellent rate capability.The specific capacitance keeps a capacitance of 589 F g-1 when the current density increases to 40 A g-1.The specific capacitance of 82.6% is maintained after 1500 cycles at 2 A g-1.