Facile solvothermal synthesis and high supercapacitor performance of NiCo2O4 nanorods

High‐Performance Aqueous Asymmetric Supercapacitors Based on Microwave‐Synthesized Self‐Supported NiCo2O4 Nanograss and Carbide‐Derived Carbon

“…where the symbols I , m , Δ u , v and are current density (A), mass of active materials (g), potential window (V), potential scan rate (V/s) and integrated area from CV curves.The specific capacitances of NiCo 2 O 4 /NF electrode at the scan rate of 1, 5, 10, 20, 25, 50, 80 and 100 mV/s are determined to be 1042, 839, 726, 608, 569, 439, 346 and 303 F/g, respectively, which are superior or comparable to that of other reporters, such as pure NiCo 2 O 4 and novel hierarchical NiCo 2 O 4 nanosheets@hollow microrod arrays . The specific capacitance decreases in the value at higher scan rate, which is ascribed to the electrolyte ions with insufficient time to move across the active sites of the electrode . With decreasing scan speed, more and more electrolyte ions pass through the electrode contributing higher specific capacitance.…”

“…The diffraction peaks appear at 2 θ values of 18.90°, 31.34°, 36.78°, 38.44°, 44.68°, 55.24°, 59.02° and 65.10°, corresponding to (111), (220), (311), (222), (400), (422), (511) and (440) crystalline planes of cubic spinel NiCo 2 O 4 (JCPDS No. 20–0781) . Three other diffraction peaks at 44.68°, 52.02° and 76.54° originate from the substrate materials NF.…”

“…As power density increasing to 3970.1 W/kg, energy density can still maintain the value of 16.5 Wh/kg, indicating satisfying electrochemical property of the material. In addition, energy density of NiCo 2 O 4 //CDC ASC is superior than that of other ASCs in literature . More interestingly, two serially connected ASCs are used to light a red LED for 5 min (Figure c and 5d).…”

“…As an important member of TMOs family, spinel nickel cobaltite (NiCo 2 O 4 ) has been considered as excellent pseudocapacitance due to abundant resources, environmental friendliness and rich redox reactions. Up to now, several researchers has focus on NiCo 2 O 4 based material with various nanostructures to improve the electrochemical properties, such as nanowires, nanorods, nanosheets, hollow and hierarchical arrays . Nonetheless, there is few reports about ASC based on the combination of NiCo 2 O 4 and CDC to improve energy storage performance.…”

Hierarchitecture Co 2 (OH) 3 Cl@FeCo 2 O 4 composite as a novel and high‐performance electrode material applied in supercapacitor

“…Herein, a facile one‐step hydrothermal route has used to prepared hierarchitecture Co 2 (OH) 3 Cl@FeCo 2 O 4 composite without following treatment in this work. Compared with other synthesis method (such as pulsed laser deposition, precipitation, electrochemical deposition, sol‐gel method, etc. ), hydrothermal route has the advantages in various product morphologies with simply, safe and low‐cost operation.…”