Facile synthesis of NiO nanoflakes via hydrothermal route: Effect of urea concentration

Novel composite of ZnMoO4/Ni(OH)2 as an electrode material for enhanced performance in energy-storage applications

“…For NOH, the appearance of major peaks at 33.6°, 38.3°, 58.9°, 51.6°, and 62.7° confirmed the formation of Ni(OH) 2 , which was consistent with the literature. 31 In the composites Z/N-1, Z/N-2, and Z/N-3, the same characteristic peaks for ZMO with a crystalline nature were observed. However, the peaks for NOH did not appear due to the presence of its smaller amount in the composite and the high intensity of ZMO.…”

Long-Lasting Panchromatic Electrochromic Device and Energy-Dense Supercapacitor Based on Zn-Doped NiO Microstars and a Redox-Active Gel

“…Eventually, the black powder was calcined at 550 °C for 4 h and is referred to as NiO microflowers. 22 For the synthesis of Zn:NiO, Zn(NO 3 ) 2 (0.148 g) was dissolved in a homogenous dispersion of NiO (0.135 g) in ultrapure water (20 mL), corresponding to a precursor ratio of 1.1. The resulting dispersion was continuously and magnetically stirred at room temperature for 1 h, and then, NaOH was added to adjust and maintain the pH at 8.0.…”

“…The as-prepared powder was dried at 60 °C for 1 h, and it turned black. Eventually, the black powder was calcined at 550 °C for 4 h and is referred to as NiO microflowers …”

Porous 3D columnar-sphere of NiO nanomaterials synthesized for supercapacitors via hydrothermal route: impact of thiourea concentration

“…Various porous morphological materials are fabricated using different structuredirecting agents such as urea, thiourea, glycol, and sodium dodecyl sulphate (SDS). [6][7][8] Suqing Ci et al reported that urea and SDS are used for the formation of micro-flowers constructed from NiO nanosheets, which show a maximum specific capacitance of 1579 F g À1 at 1 mV s À1 scan rate. 9 Yaping Zeng et al demonstrated that ethylene glycol helps to modify the surface energy in NiO and form self-assembled 3D spheres, which exhibit a specific capacitance of 532 F g À1 at a current density of 2 A g À1 .…”