3D hierarchical NiCo2S4/Ni–Co LDH architecture for high-performance supercapacitor

Synergistic coupling of NiVAl-layered double hydroxide with few-layered Ti3C2Tx–MXene nanosheets for superior asymmetric supercapacitor performance

“…Therefore, the reasonable design of 3D nanostructures not only expands the specific surface area but also promotes fast ion diffusion channels and provides fast charging/discharging for active materials. 51,52 The growth of NiVAl-LDH arrays on the Ti 3 C 2 T x -MXene substrate was investigated using transmission electron microscopy (TEM), as depicted in Fig. 4a.…”

“…Therefore, the reasonable design of 3D nanostructures not only expands the specific surface area but also promotes fast ion diffusion channels and provides fast charging/discharging for active materials. 51,52…”

Progress of layered double hydroxide-based materials for supercapacitors

“…Finally, the two packaged devices were successfully lit in series with a red 2.2 V LED, demonstrating the potential for practical applications. Zhou et al 247 prepared porous heterostructure NiCo 2 S 4 /NiCo-LDHs on carbon fiber paper using a simple solvothermal method. The active material was deposited vertically on the carbon fiber paper and its SEM image is shown in Fig.…”

Engineering heterostructured nickel–cobalt sulfide@hydroxide nanoarrays with spontaneous and fast interfacial charge transfer for high-energy-density supercapacitors

“…The b value ranges between 0.5 and 1, where 0.5 represents that the i p is contributed by the OH À diffusion process and 1 implies that the i p is contributed by the surface capacitive process. According to eqn (11), the fitted result is provided in Fig. 5(c).…”

“…1,9 Among various pseudocapacitive materials, nickel-cobalt layered double hydroxides (Ni-Co LDH) have been regarded as promising candidates due to the attractive advantages of superior hydrophilia, high theoretical capacitance (more than 3000 F g À1 ), a fast two-dimensional ion insertion channel and high redox activity. 10,11 However, due to their low conductivity and serious agglomeration, it is difficult for Ni-Co LDH to exhibit satisfactory electrochemical performance. One effective method to address this defect is to design Ni-Co LDH with a special nanostructure and then composite them with conductive materials, such as graphene, 12 MXenes, 13 carbon nanotubes, 14 etc.…”