Amorphous nickel hydroxide nanospheres with ultrahigh capacitance and energy density as electrochemical pseudocapacitor materials.

ABSTRACT: Among numerous active electrode materials, nickel hydroxide is a promising electrode in electrochemical capacitors. Nickel hydroxide research has thus far focused on the crystalline rather than the amorphous phase, despite the impressive electrochemical properties of the latter, which includes an improved electrochemical efficiency due to disorder. Here we demonstrate high-performance electrochemical supercapacitors prepared from amorphous nickel hydroxide nanospheres synthesized via simple, green electrochemistry. The amorphous nickel hydroxide electrode exhibits high capacitance (2,188 F g(-1)), and the asymmetric pseudocapacitors of the amorphous nickel hydroxide exhibit high capacitance (153 F g(-1)), high energy density (35.7 W h kg(-1) at a power density of 490 W kg(-1)) and super-lo

SUBMITTER: Li HB 

PROVIDER: S-EPMC3674274 | biostudies-literature | 2013

REPOSITORIES: biostudies-literature