Direct Growth of Cobalt Hydroxide Rods on Nickel Foam and Its Application for Energy Storage

摘要

The present work reports synthesis of cobalt hydroxide (Co(OH)_2) rods on nickel foam and its supercapacitor application. Hierarchical Co(OH)_2 rods with length of approximately 3.5 mm and diameter of approximately 400 nm were prepared by one-step, simple, and inexpensive chemicalbath- deposition method. The direct growth of Co(OH)_2 rods on the Ni foam gave three dimensional (3D) structure for easy access of electrolyte throughout material surface. Also, well-adhered interface between Co(OH)_2 rods and Ni-foam surface gave better conduction channels. Detailed electrochemical study was performed by using cyclic voltammetry and galvanostatic charge/discharge measurements. The results demonstrate that Co(OH)_2 rods on Ni foam are efficient electrodes for supercapacitor application.