Preparation of Nickel Cobalt Sulfide Hollow Nanocolloids with Enhanced Electrochemical Property for Supercapacitors Application

Abstract

Nanostructured functional materials with hollow interiors are considered to be good candidates for a variety of advanced applications. However, synthesis of uniform hollow nanocolloids with porous texture via wet chemistry method is still challenging. In this work, nickel cobalt precursors (NCP) in sub-micron sized spheres have been synthesized by a facile solvothermal method. The subsequent sulfurization process in hydrothermal system has changed the NCP to nickel cobalt sulfide (NCS) with porous texture. Importantly, the hollow interiors can be tuned through the sulfurization process by employing different dosage of sulfur source. The derived NCS products have been fabricated into supercapacitor electrodes and their electrochemical performances are measured and compared, where promising results were found for the next-generation high-performance electrochemical capacitors.

Interconnected hierarchical NiCo2O4 microspheres as high-performance electrode materials for supercapacitors

“…19 The linear increase in N 2 uptake in the medium P/P 0 region indicates capillary condensation and multilayer adsorption in the mesopores. 25 The representative hysteresis loop in the high P/P 0 region reveals that the IH-NiCo 2 O 4 microspheres mainly consist of mesopores. 16 The SSA of the IH-NiCo 2 O 4 microspheres is calculated to be 81.27 m 2 g −1 by the Brunauer-Emmett-Teller (BET) method.…”

“…As is well-known, the electrochemical performance of electrode materials also strongly depends on their microstructures, which influence the porosity and specific surface area. 9,[24][25][26][27] NiCo 2 O 4 materials with diverse structures, 28,29 such as porous nanowires, 19 mesoporous nanosheets, 4 hierarchical hollow nanocubes, 18 hierarchical tetragonal microtubes, 30 hollow spheres, 31 and urchin-like microspheres, 32 have been synthesized, and they exhibit a distinct difference in their capacitance performance. Therefore, it is a practical strategy to explore an appropriate structural NiCo 2 O 4 to achieve high supercapacitance performance.…”

Influence of solvents in the preparation of cobalt sulfide for supercapacitors

“…This led to less electrochemical interaction between the KOH electrolyte and electrode. In addition, a diminished surface area was also observed for the water and water/ethanol-based electrodes owing to the phase segregation of the material [ 27 , 28 ]. Finally, the ethanol-based electrode showed a pair of well-defined redox peaks corresponding to a reversible faradaic reaction.…”

Microwave assisted synthesis of zinc vanadate nanoparticles and photocatalytic application

“…These NPs are usually prepared via hydrothermal heating of aqueous solution [9,10]. Nano wires, nano belts or nano-urchin shapes are synthesized by chemical parameters which depends on the arrangement of a VO network that act as a precursor in synthesized nanotubes and nanorods [11][12][13][14].…”