Rational synthesis of hierarchically porous NiO hollow spheres and their supercapacitor application

Facile hydrothermal synthesis of flowerlike ZnCo 2 O 4 microspheres as binder-free electrodes for supercapacitors

“…3c, the specific capacitances of the ZnCo 2 O 4 microspheres are 689.4 F/g at the current densities of 1 A/g. This high specific capacitance value of the flowerlike ZnCo 2 O 4 microspheres is preferable compared with previously reported values of some electrode materials with sphere or flowerlike structures, such as NiO hollow spheres (278 F/g at 1 A/g) [18] and NiCo 2 O 4 flowerlike nanostructure (658 F/g at 1 A/g) [19]. With the increase of the current densities from 1 to 15A/g, the specific capacitance gradually decreases, but 48.8% of capacitance is retained even at a high current density of 15 A/g, indicating that good rate capability of the flowerlike ZnCo 2 O 4 microspheres.…”

Hydrothermal synthesis of hierarchical mesoporous NiO nanourchins and their supercapacitor application

“…The pseudocapacitors can provide much higher specific capacitance and higher energy density than double layer capacitors [6]. The transition metal oxides, such as RuO 2 [7], MnO 2 [8], Co 3 O 4 [9], ZnO [10] and NiO [11], have been widely investigated as the promising candidates for pseudocapacitor electrode materials.…”

“…As a significant p-type semiconductor, NiO has recently attracted considerable attentions in various application fields [12], such as lithium ion batteries [13], fuel cell electrodes [11], gas sensors [14], catalysts [15] and supercapacitors [16]. Among the investigated supercapacitor materials, NiO has attracted enormous interests owing to its high theoretical capacity (2573 F g À 1 ), low cost and good pseudocapacitive performance [13,16].…”

NiO/MnO2 core/shell nanocomposites for high-performance pseudocapacitors

“…oxides and hydroxides are excellent candidates for supercapacitors. The applications of single component compound (such as RuO 2 [1], NiO [2,3], Co 3 O 4 [4,5], MnO 2 [6,7], MnOOH [8] and Fe 2 O 3 [9]) in pseudocapacitors have been well investigated. However, it is difficult for the resulting pseudocapacitors to simultaneously achieve high specific capacitance and excellent cycling stability.…”