Facile synthesis of heterogeneous Co3O4-nanowires/vertical-graphene-nanosheets on Ni foam for high performance supercapacitors

Ouyang, Kang; Guo, Guanlun; Liu, Yihui; Sun, Lin; Wei, Mingrui

doi:10.1016/j.matlet.2019.05.062

Cited by 16 publications

(5 citation statements)

References 13 publications

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“…All the powders obtained show diffraction peaks coinciding with the Co3O4 cubic spinel structure (space group F-4 3m) with file COD 00-001-1152. This agrees with other researches [13,19,20]. The XRD pattern with reflection peaks is associated with the planes (220), (311), In order to establish structural parameters and properties, Rietveld refinement was carried out with the experimental data using the GSASII code.…”

Section: Structural Characterizationsupporting

confidence: 86%

“…In section (a), the precursors obtained by the hydrothermal technique and examined by XRD are crystalline, though it is difficult to assign the definitive pattern to a specific phase. This condition has been present in other deposits [13]. In section (b), Co3O4 was calcined at 300°C for 3h in air and the crystallinity of Co3O4 is observed.…”

Section: Structural Characterizationsupporting

confidence: 59%

“…Li et al [12] analyzed the ORR activity according to the influence of nickel doping content. Ouyang et al [13] concluded the excellent capacitive performance of the composite material attributed to the improved charge transfer rate and ion diffusion path. Additionally, Ren et al [14] indicated that doping with Ni in the spinel lattice of Co3O4 improves reaction kinetics and promotes catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and evaluation of nickel doped Co3O4 produced through hydrothermal technique

Flechas

Raba-Páez

Joya

2020

DYNA

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The synthesis of undoped cobalt oxide and cobalt oxide with 4%nickel doping is studied in samples obtained through hydrothermal technique. After the final heat treatment at 300°C, X-ray diffraction analysis indicated the formation of cobalt spinel oxide with a complete replacement of nickel in the lattice. An average crystallite size of ~42 nm and ~31nm was found, as well as a particle size of ~ 20 nm and ~30 nm for Co3O4 and Co3-xNixO4, respectively. Structural parameters were established through Rietveld refinement with a good correspondence between the simulated and the experimental pattern with values of x2 = 1.25 and GOF = 0.90 for Co3O4. The energy band gap was found through UV-Vis spectroscopy in two different regions: Eg1 and Eg2 values vary between 1.54 and 2.04eV for samples doped with nickel. The SEM results indicated the formation of nanostructures with semi-cubic shape and irregular rods. Parameters such as crystal size, particle size, surface area, as well as morphology of the final product depend on doping.

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Section: Structural Characterizationsupporting

confidence: 86%

Section: Structural Characterizationsupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

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Synthesis and evaluation of nickel doped Co3O4 produced through hydrothermal technique

Flechas

Raba-Páez

Joya

2020

DYNA

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“…The XRD pattern with reflection peaks is associated with planes (111), (220), (311), (400), (422), (511), and (440) at 2θ = 20.0°, 31.27°, 38.62°, 44.81°, 55.75°, 59.45°, and 65.38°, respec-tively, and plan 〈311〉 is observed as the preferred orientation as reported in other studies present in literature. [38,39] As an interpretation of the prevailing etching and synthesis procedure, the XRD patterns of MXene present tremendously inadequate or negligible peaks. The black line that is displayed in Figure 2 highlights the XRD spectra of MXene that illustrate the microwave-assisted rapid etching of Al from the MAX phase, followed by the development of delaminated MXene sheets.…”

Section: Structural Analysis Of Mxene-co 3 O 4 Nanocomposite Materialsmentioning

confidence: 99%

Facile and Affordable Design of MXene‐Co₃O₄‐Based Nanocomposites for Detection of Hydrogen Peroxide in Cancer Cells: Toward Portable Tool for Cancer Management

Singh

Numan

Khalid

et al. 2023

Small

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Hydrogen peroxide (H2O2) is a primary reactive oxygen species (ROS) that can act as a chemical signal in developing and progressing serious and life‐threatening diseases like cancer. Due to the stressful nature of H2O2, there is an urgent need to develop sensitive analytical approaches to be applied to various biological matrices. Herein, a portable point‐of‐care electrochemical system based on MXene‐Co3O4 nanocomposites to detect H2O2 in different cancer cell‐lines is presented. The developed sensor is affordable, disposable, and highly selective for H2O2 detection. This approach achieves a dynamic linear range of 75 µm with a LOD of 0.5 µm and a LOQ of 1.6 µm. To improve the practical application, the level of ROS is evaluated both in cancer cell lines MDA‐MB‐231 and DU145, respectively, to breast and prostate cancers, and in healthy HaCat cells. Moreover, the same cancer cells are treated with transforming growth factor‐β1, and MXene‐Co3O4 modified strip is capable to monitorROS variation. The results are satisfactory compared with the cellular ROS fluorescent assay based on DCFH/DCFH‐DA. These results open new perspectives for real‐time monitoring of cancer progression and the efficacy of the therapy.

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“…The electrochemical active materials are the key components for a high energy density storage device . The electrode materials include carbon materials, − metal oxides, − and conductive polymers. , Among them are metal oxides, such as nickel oxide (NiO), manganese dioxide (MnO 2 ), cobalt trioxide (Co 3 O 4 ), and molybdenum trioxide (MoO 3 ) and conductive polymers, such as polyaniline, polypyrrole, and so on. In general, energy storage means the redox reaction of the active electrode materials during charge and discharge processes .…”

Section: Introductionmentioning

confidence: 99%

Fundamental Triangular Interaction of Electron Trajectory Deviation and P–N Junction to Promote Redox Reactions for the High-Energy-Density Electrode

Shang

Tan

Kong

et al. 2020

ACS Appl. Mater. Interfaces

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Highly efficient redox reaction of active electrode materials is the guarantee for achieving high energy density for energy storage devices. Here, we design a triangle of the electrode material involving the P–N junction between NiO (p-type) and MoO3 (n-type) and electron trajectory deviation between gold nanoparticles with NiO or MoO3. This optimized fundamental triangle structure could facilitate the redox reaction of a metal oxide, and thus the fabricated ternary nanocomposites exhibit excellent electrochemical performance. At a lower current density (0.5 A g–1), the mass specific capacitance of a single electrode can reach 943.3 F g–1, while the NiO/MoO3 tested under the same conditions only has a specific capacitance of 278.9 F g–1. The assembled asymmetric device with activated carbon shows a higher capacitance retention rate of 98.7% after long-term cycling under different current densities, and a maximum energy density of 28.9 W h kg–1 (power density of 400.1 W kg–1). The crucial prerequisite of this strategy is the lower work function of gold nanoparticles compared with active materials, which significantly reduce the activation energy of NiO/MoO3 and the formed P–N junction between p-type NiO with n-type MoO3 in their contact interfaces. This novel design of a triangle structure could be expected to be applied in other materials to develop a kind of energy storage device with excellent electrochemical performance.

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Facile synthesis of heterogeneous Co3O4-nanowires/vertical-graphene-nanosheets on Ni foam for high performance supercapacitors

Cited by 16 publications

References 13 publications

Synthesis and evaluation of nickel doped Co3O4 produced through hydrothermal technique

Synthesis and evaluation of nickel doped Co3O4 produced through hydrothermal technique

Facile and Affordable Design of MXene‐Co₃O₄‐Based Nanocomposites for Detection of Hydrogen Peroxide in Cancer Cells: Toward Portable Tool for Cancer Management

Fundamental Triangular Interaction of Electron Trajectory Deviation and P–N Junction to Promote Redox Reactions for the High-Energy-Density Electrode

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Facile synthesis of heterogeneous Co3O4-nanowires/vertical-graphene-nanosheets on Ni foam for high performance supercapacitors

Cited by 16 publications

References 13 publications

Synthesis and evaluation of nickel doped Co3O4 produced through hydrothermal technique

Synthesis and evaluation of nickel doped Co3O4 produced through hydrothermal technique

Facile and Affordable Design of MXene‐Co3O4‐Based Nanocomposites for Detection of Hydrogen Peroxide in Cancer Cells: Toward Portable Tool for Cancer Management

Fundamental Triangular Interaction of Electron Trajectory Deviation and P–N Junction to Promote Redox Reactions for the High-Energy-Density Electrode

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Facile and Affordable Design of MXene‐Co₃O₄‐Based Nanocomposites for Detection of Hydrogen Peroxide in Cancer Cells: Toward Portable Tool for Cancer Management