Abstract
In this study, we report a facile fabrication of ultrathin two-dimensional (2D) nanosheet hybrid composite, α-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 α-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.
Highlights
Interest in energy conversion and storage devices because of their unique electrical properties[18]
Ultrathin α-Fe2O3 nanosheets were synthesized by a metal ion intervened hydrothermal method with Al3+ as structure director according to our previous report[26], Ni(OH)[2] nanosheets was produced onto the surface of as-prepared α-Fe2O3 with carboxymethylcellulose (CMC) as structure director
transmission electron microscopy (TEM) images shown in Fig. 2c,d show that the center part of the structure is much darker than the edges confirming the sandwich-like structure of the nanosheet hybrid
Summary
Interest in energy conversion and storage devices because of their unique electrical properties[18]. For the first time, we presented a facile route to synthesize α-Fe2O3 nanosheet@Ni(OH)[2] nanosheet hybrid for electrode material of supercapacitor This distinctive structure has the following advantages. Α-Fe2O3 and Ni(OH)[2] are both 2D nanosheets whose 2D structures can bring controllable electrical properties and high specific surface areas for superior electrochemical activities[19,22,23]. The as-prepared α-Fe2O3@Ni(OH)[2] nanosheet hybrid exhibits 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 circles), which are superior to the performances of Ni(OH)[2] with a specific capacitance of 132 F/g and a capacity retention of 81.8%
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