Preparation, Characterization and Catalytic Activity of Nickel Molybdate (NiMoO4) Nanoparticles

Hassani, Hicham Oudghiri; Wadaani, Fahd Al

doi:10.3390/molecules23020273

Cited by 45 publications

(20 citation statements)

References 49 publications

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“…Figure 2C shows the FTIR spectra of NiMoO 4 , Mn 0.1 Ni 0.9 MoO 4 , and Mn 0.1 Ni 0.9 MoO 4 /rGO, in which the stretching vibrations of Mo−O, Mo−O−Mo, and MoO are all detected. 20 It is interesting to notice that the absorption peaks of Mo−O and MoO in NiMoO 4 at 745 and 963 cm −1 red-shift to 736 and 959 cm −1 in Mn 0.1 Ni 0.9 MoO 4 /rGO, respectively. The red-shift may be attributed to the change of chemical environment after the Mn-doping, especially the change relating to the orbital hybridization of Mn atoms and host atoms of NiMoO 4 .…”

Section: ■ Results and Discussionmentioning

confidence: 92%

“…FTIR and Raman spectroscopies were further used to explore the chemical composition and molecular structure of as-prepared samples. Figure C shows the FTIR spectra of NiMoO 4 , Mn 0.1 Ni 0.9 MoO 4 , and Mn 0.1 Ni 0.9 MoO 4 /rGO, in which the stretching vibrations of Mo–O, Mo–O–Mo, and MoO are all detected . It is interesting to notice that the absorption peaks of Mo–O and MoO in NiMoO 4 at 745 and 963 cm –1 red-shift to 736 and 959 cm –1 in Mn 0.1 Ni 0.9 MoO 4 /rGO, respectively.…”

Section: Resultsmentioning

confidence: 93%

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Mn-Doped NiMoO₄ Mesoporous Nanorods/Reduced Graphene Oxide Composite for High-Performance All-Solid-State Supercapacitor

Yuan

Yao

Jiang

et al. 2020

ACS Appl. Energy Mater.

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Mn-doping has great influence on the structural and electrical properties of NiMoO 4 , which plays an important role in determining its electrochemical activities. In this work, Mn-doped NiMoO 4 was prepared. Structural characterization and theoretical calculation reveal that Mn-doped NiMoO 4 (Mn 0.1 Ni 0.9 MoO 4 ) has smaller unit cell parameters and is more reactive than NiMoO 4 because of the defects produced by Mn-doping. On the basis of that, we prepared a composite consisting of Mn 0.1 Ni 0.9 MoO 4 mesoporous nanorods and reduced graphene oxide (Mn 0.1 Ni 0.9 MoO 4 /rGO), which was assembled into a symmetrical all-solidstate device as electrode material, with alkaline poly(vinyl alcohol) as solid-state electrolyte. The device shows a good specific capacitance of 109.3 F•g −1 at 1 A•g −1 in a rather wide voltage range of 0−1.8 V, exhibits an excellent cycling stability with 96.1% of the capacitance retained after 200 cycles, and delivers a high energy density of 49.2 Wh•kg −1 at 1800 W•kg −1 . The all-solid-state supercapacitor owns superior flexibility and maintains 83.6% of its initial specific capacitance under the bent condition. When tested in a three-electrode system, the Mn 0.1 Ni 0.9 MoO 4 /rGO composite exhibits a maximum specific capacitance of 688.9 F•g −1 at 0.5 A•g −1 that is much better than NiMoO 4 and Mn 0.1 Ni 0.9 MoO 4 . The results show that the Mn 0.1 Ni 0.9 MoO 4 /rGO composite stands out as a kind of transition-metal-doped electrode material for flexible all-solid-state supercapacitors.

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Section: ■ Results and Discussionmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 93%

Mn-Doped NiMoO₄ Mesoporous Nanorods/Reduced Graphene Oxide Composite for High-Performance All-Solid-State Supercapacitor

Yuan

Yao

Jiang

et al. 2020

ACS Appl. Energy Mater.

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“…Their catalytic activity enables different processes such as the selective oxidation of methanol or the reduction of nitrophenol isomers. Deng et al reported about a certain kind of molybdenum-containing high-entropy oxide with desulfurization capabilities. − Apart from the catalytic properties, copper molybdate can be used as a photocatalyst, and iron molybdate exhibits interesting ferromagnetic properties at room temperature. , Furthermore, metal molybdates show promise for application in (super)capacitors and batteries. − Molybdates with “small” Mo numbers (e.g., MoO 4 2– , Mo 2 O 7 2– , etc.) are composed of Mo 6+ ions, tetrahedrally or octahedrally coordinated by oxygen ions (Figure S1).…”

Section: Introductionmentioning

confidence: 99%

High Entropy and Low Symmetry: Triclinic High-Entropy Molybdates

et al. 2020

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Metal molybdates constitute a promising class of materials with a wide application range. Here, we report, to our knowledge for the first time, on the preparation and characterization of medium-entropy and high-entropy metal molybdates, synthesized by an oxalate-based coprecipitation approach. The high-entropy molybdate crystallizes in a triclinic structure, thus rendering it as high-entropy material with the lowest symmetry reported so far. This is noteworthy because high-entropy materials usually tend to crystallize into highly symmetrical structures. It is expected that application of the high-entropy concept to metal molybdates alters the material's characteristics and adds the features of high-entropy systems, that is, tailorable composition and properties. The phase purity and solid solution nature of the molybdates were confirmed by XRD, Raman spectroscopy, TEM, XPS, and ICP-OES.

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“…In recent decades, metal oxides as potential materials with different capabilities have been studied [21]. The family of metal molybdates is one of the most promising examples of the mixed metal oxides, which have been extensively studied in recent years [22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Iron Molybdate Fe2(MoO4)3 Nanoparticles: Efficient Sorbent for Methylene Blue Dye Removal from Aqueous Solutions

et al. 2020

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The present study investigated iron molybdate (Fe2(MoO4)3), synthesized via a simple method, as a nanosorbent for methylene blue (MB) dye removal from aqueous solutions. Investigations of the effects of several parameters like contact time, adsorbent dose, initial dye concentration, temperature and pH were carried out. The results showed that MB removal was affected, significantly, by adsorbent dose and pH. Interestingly, lower values of adsorbent dose resulted in the removal of higher amounts of MB. At the optimum pH, the removal efficiency of 99% was gained with an initial MB concentration of ≤60 ppm. The kinetic study specified an excellent correlation of the experimental results with the pseudo-second-order kinetics model. Thermodynamic studies proved a spontaneous, favorable and endothermic removal. The maximum amount of removal capacity of MB dye was 6173 mg/g, which was determined from the Langmuir model. The removal efficiency was shown to be retained after three cycles of reuse, as proven by thermal regeneration tests. The presence and adsorption of the dye onto the Fe2(MoO4)3 nanoparticle surface, as well as the regeneration of the latter, was ascertained by scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FTIR). These findings are indicative that the investigated nanosorbent is an excellent candidate for the removal of MB in wastewater.

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Preparation, Characterization and Catalytic Activity of Nickel Molybdate (NiMoO4) Nanoparticles

Cited by 45 publications

References 49 publications

Mn-Doped NiMoO₄ Mesoporous Nanorods/Reduced Graphene Oxide Composite for High-Performance All-Solid-State Supercapacitor

Mn-Doped NiMoO₄ Mesoporous Nanorods/Reduced Graphene Oxide Composite for High-Performance All-Solid-State Supercapacitor

High Entropy and Low Symmetry: Triclinic High-Entropy Molybdates

Iron Molybdate Fe2(MoO4)3 Nanoparticles: Efficient Sorbent for Methylene Blue Dye Removal from Aqueous Solutions

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Preparation, Characterization and Catalytic Activity of Nickel Molybdate (NiMoO4) Nanoparticles

Cited by 45 publications

References 49 publications

Mn-Doped NiMoO4 Mesoporous Nanorods/Reduced Graphene Oxide Composite for High-Performance All-Solid-State Supercapacitor

Mn-Doped NiMoO4 Mesoporous Nanorods/Reduced Graphene Oxide Composite for High-Performance All-Solid-State Supercapacitor

High Entropy and Low Symmetry: Triclinic High-Entropy Molybdates

Iron Molybdate Fe2(MoO4)3 Nanoparticles: Efficient Sorbent for Methylene Blue Dye Removal from Aqueous Solutions

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Mn-Doped NiMoO₄ Mesoporous Nanorods/Reduced Graphene Oxide Composite for High-Performance All-Solid-State Supercapacitor

Mn-Doped NiMoO₄ Mesoporous Nanorods/Reduced Graphene Oxide Composite for High-Performance All-Solid-State Supercapacitor