CdS decorated MnWO<sub>4</sub> nanorod nanoheterostructures: a new 0D–1D hybrid system for enhanced photocatalytic hydrogen production under natural sunlight

Sethi, Yogesh A.; Kulkarni, Aniruddha K.; Ambalkar, Anuradha A.; Khore, Supriya K.; Gunjal, Aarti R.; Gosavi, Suresh; Kale, Bharat B.

doi:10.1039/d0na00843e

Cited by 22 publications

(7 citation statements)

References 46 publications

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“…All of the tungstate parent compounds that we synthesized are semiconductors with measured band gaps (E g ) ranging from 2.6 to 3.8 eV: 2.5 eV for MnWO 4 , 2.6 eV for FeWO 4 , 2.7 eV for CoWO 4 , 3.1 eV for NiWO 4 , 2.3 eV for CuWO 4 , and 3.8 eV for ZnWO 4 (Figure S3). These band gap measurements fall within 0.2 eV of previously published band gaps for all compounds. − In contrast, the high-entropy tungstate A 6 WO 4 was black and had no observable band gap down to 1.5 eV, based on UV–visible (UV–vis) absorption spectroscopy. FT-IR measurements, which can provide evidence of lower–energy transitions associated with narrow band gaps, revealed a transition at 0.24 eV, when transformed into a Tauc plot.…”

Section: Resultssupporting

confidence: 82%

Synthesis and Magnetic, Optical, and Electrocatalytic Properties of High-Entropy Mixed-Metal Tungsten and Molybdenum Oxides

Katzbaer,

Vincent,

Mao

et al. 2023

Inorg. Chem.

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High-entropy oxides (HEOs) are of interest for their unique physical and chemical properties. Significant lattice distortions, strain, and tolerance for high-vacancy concentrations set HEOs apart from single-metal or mixed-metal oxides. Herein, we synthesized and characterized the structures and compositions, along with the optical, magnetic, and electrocatalytic properties, of two families of high-entropy mixed-metal tungsten and molybdenum oxides, AWO4 and B2Mo3O8, where A and B are 3d transition metals. The HEOs A6WO4 (A = Mn, Fe, Co, Ni, Cu, and Zn) and B2 5Mo3O8 (B = Mn, Fe, Co, Ni, and Zn), as well as all accessible single-metal AWO4 and B2Mo3O8 parent compounds, were synthesized using high-temperature solid-state methods. X-ray photoelectron spectroscopy analysis of the surfaces revealed that the HEOs largely had the metal oxidation states expected from the bulk chemical formulas, but in some cases they were different than in the parent compounds. A6WO4 exhibited antiferromagnetic (AFM) ordering with a Néel temperature of 30 K, which is less than the average of its AFM parent compounds, and had a narrow band gap of 0.24 eV, which is much lower than all of its parent compounds. B2 5Mo3O8 was paramagnetic, despite the existence of AFM and ferromagnetic ordering in several of its parent compounds and had no observable band gap, which is analogous to its parent compounds. Both A6WO4 and B2 5Mo3O8 exhibited superior catalytic activity relative to the parent compounds for the oxygen evolution reaction, the oxidation half reaction of overall water splitting, under alkaline conditions, based on the overpotential required to reach the benchmark surface area normalized current density. Consistent with literature predictions of OER durability for ternary tungsten and molybdenum oxides, A6WO4 and B2 5Mo3O8 also exhibited stable performance without significant dissolution during 10 h stability experiments at a constant current.

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Section: Resultssupporting

confidence: 82%

Synthesis and Magnetic, Optical, and Electrocatalytic Properties of High-Entropy Mixed-Metal Tungsten and Molybdenum Oxides

Katzbaer,

Vincent,

Mao

et al. 2023

Inorg. Chem.

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“…After evaluating the morphological features of Cd 1– x Cu x WO 4 nanostructures, we have proposed a growth mechanism for nanorods along the (1 0 0) plane using the Ostwald ripening process . Initially, a supersaturated solution was achieved under the hydrothermal condition at a constant temperature of 180 °C.…”

Section: Resultsmentioning

confidence: 99%

Modulation of Magnetic and Luminescence Properties via Control Cu-Doped in CdWO₄ Nanorods for Photocatalytic Applications

Gandhi

Chiu

et al. 2022

ACS Appl. Nano Mater.

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Monoclinic CdWO4 is a member of the tungstate family with great potential in diverse applications. However, CdWO4 exhibits a diamagnetic property with a wideband gap of 3.7 eV, limiting its widespread applications. This study reports significant modulation of magnetic and optical properties of hydrothermally grown single-crystalline CdWO4 nanorods with controllable substitution of Cu2+ ions at the Cd2+ site. The chemical environment of Cu and the magnetic and luminescence of nanorods were thoroughly investigated using synchrotron-based powder X-ray diffraction, temperature-dependent photoluminescence, X-ray absorption, element selective X-ray excited optical luminescence spectroscopies, a magnetometer, and micro-Raman spectroscopy. The main feature of this study is an astonishing redshift of ∼0.8 eV in the bandgap energy accompanied by a relative ∼46% drop in the internal quantum efficiency and a progressive transition from diamagnetic to an enhanced magnetization concerning the Cu content. The experimental findings show that significant modulation in optical and magnetic properties is correlated with Cu-doping-induced intermediate energy states and [CuO6] ferromagnetic clusters. The outcome of this study provides important insight into designing doped nanomaterials for photocatalytic applications.

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“…The photocatalytic hydrogen generation mechanism from water is well reported and discussed in the previous literature. 47 The Semiconductor photocatalyst after interaction with solar light with energy greater than or equal to band gap energy generates electrons in CB and holes in VB. It causes redox reactions of adsorbed species on a semiconducting material.…”

Section: Resultsmentioning

confidence: 99%

Unique hierarchical SiO₂@ZnIn₂S₄marigold flower like nanoheterostructure for solar hydrogen production

et al. 2021

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CdS decorated MnWO₄ nanorod nanoheterostructures: a new 0D–1D hybrid system for enhanced photocatalytic hydrogen production under natural sunlight

Abstract: Herein, we have demonstrated the CdS decorated MnWO4 nanorods nanoheterostructure by facile solvothermal method. The heterostructures have been used as photocatalyst for hydrogen production under solar light.

Cited by 22 publications

References 46 publications

Synthesis and Magnetic, Optical, and Electrocatalytic Properties of High-Entropy Mixed-Metal Tungsten and Molybdenum Oxides

Synthesis and Magnetic, Optical, and Electrocatalytic Properties of High-Entropy Mixed-Metal Tungsten and Molybdenum Oxides

Modulation of Magnetic and Luminescence Properties via Control Cu-Doped in CdWO₄ Nanorods for Photocatalytic Applications

Unique hierarchical SiO₂@ZnIn₂S₄marigold flower like nanoheterostructure for solar hydrogen production

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CdS decorated MnWO4 nanorod nanoheterostructures: a new 0D–1D hybrid system for enhanced photocatalytic hydrogen production under natural sunlight

Abstract: Herein, we have demonstrated the CdS decorated MnWO4 nanorods nanoheterostructure by facile solvothermal method. The heterostructures have been used as photocatalyst for hydrogen production under solar light.

Cited by 22 publications

References 46 publications

Synthesis and Magnetic, Optical, and Electrocatalytic Properties of High-Entropy Mixed-Metal Tungsten and Molybdenum Oxides

Synthesis and Magnetic, Optical, and Electrocatalytic Properties of High-Entropy Mixed-Metal Tungsten and Molybdenum Oxides

Modulation of Magnetic and Luminescence Properties via Control Cu-Doped in CdWO4 Nanorods for Photocatalytic Applications

Unique hierarchical SiO2@ZnIn2S4marigold flower like nanoheterostructure for solar hydrogen production

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CdS decorated MnWO₄ nanorod nanoheterostructures: a new 0D–1D hybrid system for enhanced photocatalytic hydrogen production under natural sunlight

Modulation of Magnetic and Luminescence Properties via Control Cu-Doped in CdWO₄ Nanorods for Photocatalytic Applications

Unique hierarchical SiO₂@ZnIn₂S₄marigold flower like nanoheterostructure for solar hydrogen production