Enhanced electrochemical energy storage properties of carbon coated Co3O4 nanoparticles-reduced graphene oxide ternary nano-hybrids

Tungsten oxide (WO3), MXene, and an WO3/MXene nanocomposite were synthesized to study their photocatalytic and biological applications. Tungsten oxide was synthesized by an easy and cost-effective hydrothermal method, and its composite with MXene was prepared through the sonication method. The synthesized tungsten oxide, MXene, and its composite were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared (FTIR), energy-dispersive X-ray analysis (EDX), and Brunauer–Emmett–Teller (BET) for their structural, morphological, spectral, elemental and surface area analysis, respectively. The crystallite size of WO3 calculated from XRD was ~10 nm, the particle size of WO3 was 130 nm, and the average thickness of MXene layers was 175 nm, which was calculated from FESEM. The photocatalytic activity of as-synthesized samples was carried out for the degradation of methylene blue under solar radiation, MXene, the WO3/MXene composite, and WO3 exhibited 54%, 89%, and 99% photocatalytic degradation, respectively. WO3 showed maximal degradation ability; by adding WO3 to MXene, the degradation ability of MXene was enhanced. Studies on antibacterial activity demonstrated that these samples are good antibacterial agents against positive strains, and their antibacterial activity against negative strains depends upon their concentration. Against positive strains, the WO3/MXene composite’s inhibition zone was at 7 mm, while it became 9 mm upon increasing the concentration. This study proves that WO3, MXene, and the WO3/MXene nanocomposite could be used in biological and environmental applications.

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“…By using the Debye-Scherer equation, the crystallite size of the as-fabricated tungsten oxide was calculated [58].…”

Section: Xrdmentioning

confidence: 99%

Synthesis, Characterization, Photocatalysis, and Antibacterial Study of WO3, MXene and WO3/MXene Nanocomposite

et al. 2022

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“…The very intense nature of the diffraction peaks indicates an excellent crystallinity of the prepared ZnO sample [22] . The detection of specific diffraction peaks and the lack of impurity peaks demonstrate the high purity of ZnO nanostructures [23] . For aluminum‐doped ZnO, the principal diffraction peak intensity (2θ=36.49) is slightly reduced.…”

Section: Resultsmentioning

confidence: 95%

“…[22] The detection of specific diffraction peaks and the lack of impurity peaks demonstrate the high purity of ZnO nanostructures. [23] For aluminum-doped ZnO, the principal diffraction peak intensity (2θ = 36.49) is slightly reduced. Typically, the intensity of the diffraction peak is reduced by replacing the host metal ion with the smaller or larger foreign metal ion.…”

Section: Structural Investigationsmentioning

confidence: 98%

Fabrication of Silica‐Supported Al‐Doped ZnO and Its Use in the Elimination of the Toxic Organic Ingredients from Industrial Effluents

et al. 2021

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Herein, an easy co-precipitation method was adopted to fabricate Al-doped ZnO nanoflakes as a photocatalyst to remove noxious organic dye from industrial waste. The silica (SiO 2 ) additive, owing to its network structure and excessive hydroxyl groups (Si-OH), has a great potential to capture dye molecules in its porous network. Application studies have shown that the Al-doped ZnO/SiO 2 nanohybrid is more suitable for practical application because it eliminates almost 95 % of methylene blue (MB) dye after 120 minutes of exposure to solar light irradiation. The exceptional photodegradation efficiency of the Al-doped ZnO/SiO 2 nanohybrid can be accredited to its narrower optical band gap, distinctive texture, hybrid composition, and good dye holding ability. The Al-doped ZnO nanoflakes exhibited a superior photocurrent response that was 4.60 times more than the bare ZnO response. Furthermore, EIS and Mott-Schottky studies reveal that the Al-doped ZnO catalyst facilitates the effective charge separation/transfer process and impedes electron-hole pair recombination, resulting in enhanced photocatalytic activity .

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“…Moreover, two additional diffraction peaks at 44.12°a nd 64.5°were also detected in the XRD profiles of all three Co-doped MnO samples. In fact, these two newly detected diffraction may obese due to the diffractions from the 400 and 440 crystal planes of Co-dopant (ICCD # 43-1003) [30]. The intensity of dopant ion peaks is highest for the Co-MnO-C sample due to the higher percentage molar ratio of dopant metal cation was maximum (1.6%) during the fabrication of this sample.…”

Section: Xrd Studymentioning

confidence: 92%

New Co-MnO based Nanocrsytallite for photocatalysis studies driven by visible light

Touqeer

Baig

Aadil

et al. 2020

Journal of Taibah University for Science

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A proficient, eco-friendly, and cost-effective catalyst for remediation of organic contaminants in the environment is a burning issue in recent decades. In the present study, the cobalt doped MnO (Co-MnO) photocatalyst was synthesized via cost-effective and environmentally friendly reverse micelle route. The X-ray diffraction (XRD) results confirmed the synthesis of well-defined cubic-phased MnO and Co-MnO. XRD structural parameters and Williamson-Hall plot of MnO and Co-MnO samples were also explained in detail. Optical band gap analysis revealed an enhanced red-shift of 2.16 eV for Co-MnO photocatalyst as compared to pristine MnO (2.81 eV). The remediation efficiency of pristine MnO and its cobalt doped sample was also was tested using an organic contaminant crystal violet (CV) dye. Excellent synergistic effects of adsorption and photocatalysis at normal conditions, simple degradation mechanism, impressive kinetic investigation, and the low dose utilization proved that the newly synthesized Co-MnO photocatalyst might have commercial applications for environmental applications.

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Enhanced electrochemical energy storage properties of carbon coated Co3O4 nanoparticles-reduced graphene oxide ternary nano-hybrids

Cited by 162 publications

References 51 publications

Synthesis, Characterization, Photocatalysis, and Antibacterial Study of WO3, MXene and WO3/MXene Nanocomposite

Synthesis, Characterization, Photocatalysis, and Antibacterial Study of WO3, MXene and WO3/MXene Nanocomposite

Fabrication of Silica‐Supported Al‐Doped ZnO and Its Use in the Elimination of the Toxic Organic Ingredients from Industrial Effluents

New Co-MnO based Nanocrsytallite for photocatalysis studies driven by visible light

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