Selective synthesis of nickel oxide nanowires and length effect on their electrochemical properties

Hydrothermal-synthesized Co(OH)2 nanocone arrays for supercapacitor application

“…The b-Co(OH) 2 nanocone arrays exhibit a pseudocapacitance of 562 F g À1 at 2 A g À1 , 488 F g À1 at 4 A g À1 , 390 F g À1 at 8 A g À1 , 385 F g À1 at 16 A g À1 and 377 F g À1 at 32 A g À1 , respectively. These values are higher than those obtained from NiO nanowire arrays [28], and comparable to Co 3 O 4 nanowire arrays [29] and Co(OH) 2 nanowire arrays reported by Jiang et al [22] and Yuan et al [23], but much lower than those porous electrodeposited a-Co(OH) 2 nanoflakes films [18]. Fig.…”

Size-dependent capacitance of NiO nanoparticles synthesized from Ni-based coordination polymer precursors with different crystallinity

“…The specific capacitance for NiO-19 nm was determined to be 165, 154, 150, 145, and 134 F g À1 at scan rates of 10, 20, 30, 50 and 100 mV s À1 , respectively. Although there are some reports on different materials showing much higher specific capacitances [29][30][31], it still can compare with other recent reports on NiO architectures [8,13,32,33]. CV currents are directly proportional to the scan rates of CV, which demonstrates that, an ideal capacitive behaviour.…”

“…Transition-metal oxides, such as ruthenium oxide [7], nickel oxide (NiO) [8], cobalt oxide [9] and manganese oxide [10], have been extensively studied in electrochemical capacitor electrodes. Among them, the versatile NiO semiconductor with various morphologies is a potentially interesting electrode material due to their (i) outstanding electrochemical property with high theoretical specific capacitance, (ii) natural abundance and low cost, as well as their (iii) good capacitive retention and stability in corrosive alkaline conditions [11][12][13].…”

Hydrothermal synthesis and electrochemical performance of NiO microspheres with different nanoscale building blocks

“…It is well known that the properties and applications of NiO are closely related to its morphology, therefore, the synthesis of NiO with different size and shape has an important significance in fundamental science and practical application. Up to now, NiO with various morphologies has been prepared, such as nanoparticles [14], nanorods/nanowires/nanofibers [15][16][17][18], nanosheets [19], nanotubes [20], flower-like structures [21], hollow spheres [22] and nanosheet-based NiO microspheres [23]. However, there are few reports about NiO microspheres with different building blocks used in electrochemical capacitors.…”