Architecture of 3D ZnCo 2 O 4 marigold flowers: Influence of annealing on cold emission and photocatalytic behavior

Kokane, Sanjay B.; Suryawanshi, Sachin R.; Sasikala, R.; More, Mahendra A.; Sartale, Shrikrishna D.

doi:10.1016/j.matchemphys.2017.03.007

Cited by 47 publications

(11 citation statements)

References 53 publications

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“…ZnCo 2 O 4 belongs to a group of spinel oxides [14] with Zn 2+ residing in the tetrahedral position and the Co 3+ staying in the octahedral place [15]. Due to the relatively narrow band gap of 2.67 eV [16] and long range (200–800 nm) light response [17], ZnCo 2 O 4 could be a suitable candidate for photocatalytic organic pollutant degradation [18]. However, ZnCo 2 O 4 depicts poor quantum yield owing to the low separation of photo inspired electron-hole pairs and week surface visible light photo absorption.…”

Section: Introductionmentioning

confidence: 99%

Anchoring Plasmonic Ag@AgCl Nanocrystals onto ZnCo2O4 Microspheres with Enhanced Visible Photocatalytic Activity

Liu

Wang

et al. 2019

Nanoscale Res Lett

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In this work, a comprehensive investigation of the composite Ag@AgCl/ZnCo2O4 microspheres photocatalyst, prepared by a facile two-step method, is presented, and using complementary characterization tools such as X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X ray spectroscopy (EDX), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HR-TEM), selected area electron diffraction (SAED), X-ray photoelectron spectroscopy (XPS), UV-Vis diffuse reflectance spectroscopy (DRS), and Brunauer-Emmett-Teller (BET). Results show that the composite Ag@AgCl/ZnCo2O4 photocatalyst has good microspheres morphology and high crystalline and its absorption intensity in the whole spectrum range is higher than that of pure ZnCo2O4. It is observed that the specific surface area of the composite Ag@AgCl/ZnCo2O4 photocatalyst and the adsorption efficiency of rhodamine B (RhB) increase as a result of deposition of Ag@AgCl. In the Ag@AgCl/ZnCo2O4 degradation system of RhB, the photocatalytic degradation rate of 0.2Ag@AgCl/ZnCo2O4 becomes 99.4% within 120 min, and RhB is almost completely degraded. The reaction rate constant of composite 0.2Ag@AgCl/ZnCo2O4 photocatalyst is found to be 0.01063 min−1, which is 1.6 times that of Ag@AgCl and 10 times of the minimum value of ZnCo2O4. In addition, the radical capture experiment indicates that, in the reaction system of Ag@AgCl/ZnCo2O4, the main oxidative species of Ag@AgCl/ZnCo2O4 photocatalyst are superoxide anion (O·− 2− 2) and hole (h+) and not hydroxyl radical (·OH). Based on the results, a Z-scheme plasmon photocatalytic mechanism of Ag@AgCl/ZnCo2O4 composite system is proposed, to elucidate the RhB degradation.

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Section: Introductionmentioning

confidence: 99%

Anchoring Plasmonic Ag@AgCl Nanocrystals onto ZnCo2O4 Microspheres with Enhanced Visible Photocatalytic Activity

Liu

Wang

et al. 2019

Nanoscale Res Lett

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“…From the XRD pattern of Co 3 O 4 /CF, the dominant diffraction crystal planes of (311) and (400), along with the other planes (220), (222), (422), (440), and (531), can be indexed to the cubic spinel structure of Co 3 O 4 (JCPDS 42-1467) . From the XRD pattern of ZnCo 2 O 4 /Co 3 O 4 /CF, the dominant diffraction crystal planes of (311) and (400) with additional crystal planes of (222), (511), (400), and (533) can be indexed to the crystalline cubic spinel ZnCo 2 O 4 nanostructure (JCPDS 23-1390), which formed over Co 3 O 4 /CF …”

Section: Resultsmentioning

confidence: 99%

ZnCo₂O₄ Nanoflowers Grown on Co₃O₄ Nanowire-Decorated Cu Foams for in Situ Profiling of H₂O₂ in Live Cells and Biological Media

Mani

Selvaraj

Peng

et al. 2019

ACS Appl. Nano Mater.

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A robust real-time quantification method is essential to understand the physiological roles of endogenous H2O2 in biological systems. For this purpose, we described a binary transition-metal oxide (TMO)-based nanointerface, i.e., spinal zinc cobaltite/cobalt oxide ternary nanoarrays (ZnCo2O4/Co3O4) on a Cu foam (CF). The ZnCo2O4/Co3O4/CF facilitates H2O2 reduction at a minimized overpotential (−0.10 V vs Ag/AgCl). which is several millivolts away from the voltammetric regions of common biological and oxygen interferences, making the electrode highly selective in the presence of 5-fold excess concentrations of biological species. In the presence of ZnCo2O4, the electrocatalytic capability of Co3O4 has increased significantly by enlarging the electrochemical active area of the electrode (0.538 cm2). A substantial improvement in the stability (97.24%) and reproducibility (relative standard deviation = 3.14%) are attained because the direct growth of nanomaterials is generated on CF in close proximity with the electrode surface and strengthens the affinity. The modified electrode endows ultrasensitivity (detection limit = 1 nM) and quantifies the amount of H2O2 released from mammalian cells (8.7 × 10–14 mol). Binary TMOs hold promise in tailoring a reliable H2O2-detecting interface for real-time, in vivo applications.

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“…The oxidative and reductive reactions are expressed as OH − + h + → ⋅ OH and O 2 + e − → O 2 − , respectively. These electrons can reduce the oxidants species adsorbed on catalyst surface to yield the oxidizing species such as H 2 O 2 , O 2 − /HO 2 and OH radicals, which are considered to be responsible for the dye degradation ,. The mechanism of photocatalytic degradation is shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

Synthesis of SnS and ZnS Hollow Microarchitectures Decorated with Nanostructures and Their Photocatalytic Behavior for Dye Degradation

et al. 2018

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SnS and ZnS hollow microarchitectures decorated with nanostructures were synthesized by catalysis free thermal evaporation technique using metal microwires and sulfur powder as starting materials. For SnS, we observed a microtube formation comprised of a thin metallic Sn layer in the inner surface, SnS orthorhombic structure thick layer with SnS nanostructures on the top. For ZnS, we found out the formation of hollow sphere with a thin metallic layer in the inner part, a thick cubic phase layer of ZnS, and on this second phase, nanostructures of ZnS hexagonal crystal phase grew up homogeneously. The surface tension, intrinsic to liquids, induces the formation of a microsphere in ZnS sample in order to minimize the surface area. ZnS and SnS hollow semiconducting microstructures have exhibited efficient activity to degrade the methylene blue under simulated sunlight irradiation. The results reveal that ZnS microstructures have higher photoactivity to organic degradation when compare to SnS in the same time interval. The observed results demonstrate the potential of thermal evaporation process without any catalyst material as a simple, fast and efficient route to obtain hollow hierarchically micro/nano architectures of SnS and ZnS with enhanced photocatalytic activity.

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Architecture of 3D ZnCo 2 O 4 marigold flowers: Influence of annealing on cold emission and photocatalytic behavior

Cited by 47 publications

References 53 publications

Anchoring Plasmonic Ag@AgCl Nanocrystals onto ZnCo2O4 Microspheres with Enhanced Visible Photocatalytic Activity

Anchoring Plasmonic Ag@AgCl Nanocrystals onto ZnCo2O4 Microspheres with Enhanced Visible Photocatalytic Activity

ZnCo₂O₄ Nanoflowers Grown on Co₃O₄ Nanowire-Decorated Cu Foams for in Situ Profiling of H₂O₂ in Live Cells and Biological Media

Synthesis of SnS and ZnS Hollow Microarchitectures Decorated with Nanostructures and Their Photocatalytic Behavior for Dye Degradation

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Architecture of 3D ZnCo 2 O 4 marigold flowers: Influence of annealing on cold emission and photocatalytic behavior

Cited by 47 publications

References 53 publications

Anchoring Plasmonic Ag@AgCl Nanocrystals onto ZnCo2O4 Microspheres with Enhanced Visible Photocatalytic Activity

Anchoring Plasmonic Ag@AgCl Nanocrystals onto ZnCo2O4 Microspheres with Enhanced Visible Photocatalytic Activity

ZnCo2O4 Nanoflowers Grown on Co3O4 Nanowire-Decorated Cu Foams for in Situ Profiling of H2O2 in Live Cells and Biological Media

Synthesis of SnS and ZnS Hollow Microarchitectures Decorated with Nanostructures and Their Photocatalytic Behavior for Dye Degradation

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ZnCo₂O₄ Nanoflowers Grown on Co₃O₄ Nanowire-Decorated Cu Foams for in Situ Profiling of H₂O₂ in Live Cells and Biological Media