Mesoporous NiCo2O4 nanoneedles grown on three dimensional graphene networks as binder-free electrode for high-performance lithium-ion batteries and supercapacitors
“…The peaks located at 151.6, 457.6, 455.2, 505.7, 656.6, and 1096.4 cm −1 , respectively, correspond to F 2g , E g , L O , A 1g , and 2 L O modes of NiCo 2 O 4 , while the peak located at 501.3 cm −1 belongs to NiO. These results are well consistent with the previously reported literatures [18, 21, 24]. Fig.…”
Section: Resultssupporting
confidence: 93%
“…Zhang et al [20] showed that flower-like NiCo 2 O 4 /3D graphene foam exhibited a specific capacitance of 1402 F g −1 at 1 A g −1 . Liu et al [21] prepared a mesoporous NiCo 2 O 4 nanoneedle grown on graphene networks and the composite delivered a high specific capacitance of 970 F g −1 at 20 A g −1 .…”
A kind of sandwich-like NiCo2O4/rGO/NiO heterostructure composite has been successfully anchored on nickel foam substrate via a three-step hydrothermal method with successive annealing treatment. The smart combination of NiCo2O4, reduced graphene oxide (rGO), and NiO nanostructure in the sandwich-like nano architecture shows a promising synergistic effect for supercapacitors with greatly enhanced electrochemical performance. For serving as supercapacitor electrode, the NiCo2O4/rGO/NiO heterostructure materials exhibit remarkable specific capacitance of 2644 mF cm−2 at current density of 1 mA cm−2, and excellent capacitance retentions of 97.5% after 3000 cycles. It is expected that the present heterostructure will be a promising electrode material for high-performance supercapacitors.Graphical Abstract
“…The peaks located at 151.6, 457.6, 455.2, 505.7, 656.6, and 1096.4 cm −1 , respectively, correspond to F 2g , E g , L O , A 1g , and 2 L O modes of NiCo 2 O 4 , while the peak located at 501.3 cm −1 belongs to NiO. These results are well consistent with the previously reported literatures [18, 21, 24]. Fig.…”
Section: Resultssupporting
confidence: 93%
“…Zhang et al [20] showed that flower-like NiCo 2 O 4 /3D graphene foam exhibited a specific capacitance of 1402 F g −1 at 1 A g −1 . Liu et al [21] prepared a mesoporous NiCo 2 O 4 nanoneedle grown on graphene networks and the composite delivered a high specific capacitance of 970 F g −1 at 20 A g −1 .…”
A kind of sandwich-like NiCo2O4/rGO/NiO heterostructure composite has been successfully anchored on nickel foam substrate via a three-step hydrothermal method with successive annealing treatment. The smart combination of NiCo2O4, reduced graphene oxide (rGO), and NiO nanostructure in the sandwich-like nano architecture shows a promising synergistic effect for supercapacitors with greatly enhanced electrochemical performance. For serving as supercapacitor electrode, the NiCo2O4/rGO/NiO heterostructure materials exhibit remarkable specific capacitance of 2644 mF cm−2 at current density of 1 mA cm−2, and excellent capacitance retentions of 97.5% after 3000 cycles. It is expected that the present heterostructure will be a promising electrode material for high-performance supercapacitors.Graphical Abstract
“…Different from CNTs and graphene, the 3D substrates (such as carbon fiber paper and SSWM) not only can improve the conductivity of the electrode, but also offer the support for the active material to form a stable porous structure. 138,[141][142][143][144] Recently, a MnO 2 @CFP cathode was constructed by electrodeposition, which can cycle 1000 time at a high rate of 6.5 C with a low capacity decay rate of 0.007% per cycle for 10 000 cycles. 110 Moreover, Liang et al 122…”
Section: Compositing With Conductive Substratesmentioning
Li‐ion batteries (LIBs) with excellent cycling stability and high‐energy densities have already occupied the commercial rechargeable battery market. Unfortunately, the high cost and intrinsic insecurity induced by organic electrolyte severely hinder their applications in large‐scale energy storage. In contrast, aqueous Zn‐ion batteries (ZIBs) are being developed as an ideal candidate because of their cheapness and high security. Benefiting from high operating voltage and acceptable specific capacity, recently, manganese‐based oxides with different various crystal structures have been extensively studied as cathode materials for aqueous ZIBs. This review presents research progress of manganese‐based cathodes in aqueous ZIBs, including various manganese‐based oxides and their zinc storage mechanisms. In addition, we also discuss some optimization strategies that aim at improving the electrochemical performance of manganese‐based cathodes, and the design of flexible aqueous ZIBs based on manganese‐based cathodes (MZIBs). Finally, this review summarizes some valuable research directions, which will promote the further development of aqueous MZIBs.
“…Among different types of binary metal oxides, cobaltite (MCo 2 O 4 ) has been known as a promising material in electrochemical fields and has received considerable attention due to their unique characteristics, including high stability, facile synthesis, low cost and environmental friendliness . As an interesting cobaltite, NiCo 2 O 4 have been widely applied in electrochemical areas, such as lithium‐ion batteries , supercapacitor , ORR/OER and fuel cells , and only a few reports were available in the sensor field . Considering their excellent properties, it would be very interesting to develop electrochemical sensors based on NiCo 2 O 4 nanoparticles.…”
In the present study, a cauliflower‐like NiCo2O4−Zn/Al ()CO32-
layered double hydroxide (NiCo2O4−Zn/Al LDH) nanocomposite was used as a novel electrode material for the sensitive and selective determination of pyridoxine (vitamin B6). The structure and morphology of the as‐prepared nanocomposite were characterized by X‐ray diffraction (XRD), FT‐IR, field emission scanning electron microscopy (FESEM) and energy dispersive X‐ray spectroscopy (EDX). The NiCo2O4−Zn/Al LDH nanocomposite exhibited excellent electrocatalytic ability in the oxidation of pyridoxine, which could result from the synergistic effect of the two components. The developed sensor also provided a selective determination of pyridoxine in the presence of other species such as vitamins (B1, B2, B12 and ascorbic acid), inorganic ions and biomolecules. The fabricated sensor showed a good linear response for pyridoxine over the concentration ranges 2×10−7–2.0×10−4 mol L−1 with a low detection limit of 8.6×10−8 mol L−1. Finally, the proposed method was successfully applied for the determination of pyridoxine in commercial tablets and plasma samples with satisfactory results. Furthermore, this novel sensor displayed superior benefits in terms of stability, sensitivity, repeatability and cost. The present work aims to expand NiCo2O4 based nanocomposites to sensor fields and promote the development of pyridoxine sensors.
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