Fast fabrication of NiO@graphene composites for supercapacitor electrodes: Combination of reduction and deposition

Abstract

Graphene-based inorganic composites have been attracting more and more attention since the attachment of inorganic nanoparticles instead of conducting polymeric materials to graphene sheets turns out higher capacitances and good capacity retention. Here we report a fast fabrication method to prepare NiO@graphene composite modified electrodes for supercapacitors. By this method, preparation of electrochemical active materials of NiO/graphene and modification of the electrode can be simultaneously performed, which is achieved separately by traditional method. Moreover, the problem of poor adhesion of active materials on the surface of the electrode can be well solved. The NiO particles introduced to the films exhibit pseudocapacitive behavior arising from the reversible Faradaic transitions of Ni(II)/Ni(III) and greatly improve the capacitance of the electrodes. With the increase in NiO content, highly reduced graphene can be obtained during cyclic voltammetry sweeping, leading to the increase in the electrode capacitance. The highest specific capacitance of the constructed electrodes can reach 1258 F/g at a current density of 5 A/g.

Continuous nanobelts of nickel oxide–cobalt oxide hybrid with improved capacitive charge storage properties

“…Furthermore, if the hybrid materials are synthesized in one-dimensional morphology at nanometer dimensions, electrical properties could be tailored [5,6]. Hybrid properties are achieved through many methods such as physical mixing of its components, chemical methods such as core/shell, hierarchical structures, nanoparticle-decorated nanowires, and carbon-reinforced porous materials are few examples [7][8][9][10][11][12][13].…”

Nickel-Graphene Nanoplatelet Deposited on Carbon Fiber as Binder-Free Electrode for Electrochemical Supercapacitor Application

“…The enhanced electrochemical performance can be attributed to the interaction between Ni and GnP because of EDLC from GnP and the pseudo capacitance arising from Ni sites [25]. It is well-known that the behavior of nickel-based materials in an alkaline condition has been discussed in previous reports [15,41]. Graphene with high conductivity and high surface area stores the charge via the formation of the Helmholtz layer, while the Ni NPs exhibits a fast-faradaic reaction during charge-storage.…”

“…The nature of redox peaks in the CV curves and increase in redox peaks with increasing scan rate, reveals that the specific capacitance of the Ni-GnP@CF electrode was mainly attributed to pseudocapacitive behavior, depending on the reversible faradaic transitions of Ni 2+ /Ni 3+ [28,41]. The anodic peak at about 0.45 V (vs. Ag/AgCl) was due to the oxidation of a few monolayers of surface Ni(OH) 2 to NiOOH, whereas the cathodic peak at 0.18 V (vs. Ag/AgCl) results from the reverse reduction process [28,42].…”

Nickel Oxide/Graphene Composites: Synthesis and Applications

“…[36] Various crystalline structures of NiO, including 0D (nanoparticles (NPs)), [37,38] 1D (nanowires, nanorods), [39] 2D (nanosheets, nanoflakes, nanowalls), [40,41] and 3D (mesospheres, nanoflowers), [42] have been incorporated with graphene nanostructures to develop sufficient electrochemical properties. Al arge number of synthetic strategies appliedt oN iO/graphene nanostructures have flourished in the past few decades, such as the hydrothermal method, [40,43,44] the solvothermalm ethod, [45] chemical reduction, [46,47] electrophoretic deposition, [48,49] and atomic layer deposition( ALD). [50] Yushu Liu is aB .S.…”