Honeycomb nickel-cobalt layered double hydroxides supported on carbon skeleton as high-performance electrodes in supercapacitors

Amelioration of nickel-cobalt layered double hydroxides (NiCo-LDH) with a high specific theoretical capacitance is of great desire for high-power supercapacitors. Herein, a molybdenum (Mo) doping strategy is proposed to improve the charge-storage performance of NiCo-LDH nanosheets growing on carbon cloth (CC) via a rapid microwave process. The regulation of the electronic structure and oxygen vacancy of the LDH is consolidated by the density functional theory (DFT) calculation, which demonstrates that Mo doping narrows the band gap, reduces the formation energy of hydroxyl vacancies, and promotes ionic and charge transfer as well as electrolyte adsorption on the electrode surface. The optimal Mo-doped NiCo-LDH electrode (MoNiCo-LDH-0.05/CC) has an amazing specific capacity of 471.1 mA h g-1 at 1 A g-1 , and excellent capacity retention of 84.8% at 32 A g-1 , far superior to NiCo-LDH/CC (258.3 mA h g-1 and 76.4%). The constructed hybrid supercapacitor delivers an energy density of 103.3 W h kg-1 at a power density of 750 W kg-1 and retains the cycle retention of 85.2% after 5000 cycles. Two assembled devices in series can drive thirty LED lamps, revealing a potential application prospect of the rationally synthesized MoNiCo-LDH/CC as an energy-storage electrode material.

Regulating the Oxygen Vacancy and Electronic Structure of NiCo Layered Double Hydroxides by Molybdenum Doping for High-Power Hybrid Supercapacitors.

Prussian blue analogues derived Fe-NiCoP reveals the cooperation of Fe doping and phosphating for enhancing OER activity

In this study, reduced graphene oxide–molybdenum disulfide/iron oxide (rGO-MoS2/Fe3O4) nanocomposite, in which rGO nanosheets act as a substrate for Fe3O4 nanoparticles and the MoS2 nanostructure, was synthesized. The rGO-MoS2/Fe3O4 nanocomposite was synthesized with use of molybdenum disulfide, iron(III) chloride hexahydrate, and graphite oxide powder by application of the microwave method. The hexagonal structure of rGO-MoS2 along with the cubic geometry of Fe3O4 was confirmed by X-ray diffraction, while the decoration of the layered structure of rGO-MoS2 with Fe3O4 nanoparticles was visualized in scanning electron microscopy images of the nanocomposite. Increase in the intensity of the D band of the nanocomposite, when compared with rGO, in Raman spectra further indicated that the presence of Fe3O4 and MoS2 induced non-graphitic defects in the nanocomposite. The as-prepared sensor was applied for the electrochemical sensing of p-nitrophenol. Cyclic voltammetry was used to study the behavior of p-nitrophenol, while differential pulse voltammetry was used for a concentration study. Real samples of water, viz., distilled water, tap water, and river water, were used for this study. The detection limit obtained was 0.8 μM, and good sensitivity of 0.71 μA μM−1 cm−2 was achieved. This study provides motivation for the use of nanocomposites of carbon and transition metal dichalcogenides over use of metal-based nanoparticles. 

Two-dimensional layered rGO-MoS2 heterostructures decorated with Fe3O4 nanoparticles as an electrochemical sensor for the detection of para-nitrophenol

N-doped Crumpled Carbon Nanotubes as Advanced Electrode Material for Supercapacitor

The introduction of carbon scaffold with excellent electrical conductivity is a satisfactory strategy to improve the poor energy storage performance of polyindole (PIn). Herein, a series of PIn integrated with...

PVP derived nitrogen-doped porous carbon integrated with polyindole: nano/microspheres assembled by emulsion polymerization for asymmetric supercapacitors

Co-Mn-S nanosheets decorated with CeO2: A highly active electrocatalyst toward oxygen evolution reaction

Electrochemical sensor based on Ni/N-doped graphene oxide for the determination of hydroquinone and catechol

Nanostructure Fe–Co–B/bacterial cellulose based carbon nanofibers: An extremely efficient electrocatalyst toward oxygen evolution reaction

Modulated amorphous Fe–Ni–P nanosphere chains anchored on graphene aerogel grafted nickel foam: High-performance electrocatalyst for oxygen evolution reaction

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