Hybrid ?-Fe2O3@Ni(OH)2 nanosheet composite for high-rate-performance supercapacitor electrode.

ABSTRACT: In this study, we report a facile fabrication of ultrathin two-dimensional (2D) nanosheet hybrid composite, ?-Fe2O3 nanosheet@Ni(OH)2 nanosheet, by a two-step hydrothermal method to achieve high specific capacitance and good stability performance at high charging/discharging rates when serving as electrode material of supercapacitors. The ?-Fe2O3@Ni(OH)2 hybrid electrode not only has a smooth decrease of the specific capacitance with increasing current density, compared with the sharp decline of single component of Ni(OH)2 electrode, but also presents excellent rate capability with a specific capacitance of 356?F/g at a current density of 16?A/g and excellent cycling stability (a capacity retention of 93.3% after 500?cycles), which are superior to the performances of Ni(OH)2 with a lower specific capacitance of 132?F/g and a lower capacity retention of 81.8% at 16?A/g. The results indicate such hybrid structure would be promising as excellent electrode material for good performances at high current densities in the future.

SUBMITTER: Jiang H 

PROVIDER: S-EPMC4995458 | biostudies-literature | 2016 Aug

REPOSITORIES: biostudies-literature