Synthesis and characterization of a CuS–WO<sub>3</sub> composite photocatalyst for enhanced visible light photocatalytic activity

Theerthagiri, Jayaraman; Senthil, Raja Arumugam; Arumugam, Malathi; Selvi, A.; Madhavan, Jagannathan; Ashokkumar, Muthupandian

doi:10.1039/c5ra06512g

Cited by 137 publications

(43 citation statements)

References 35 publications

(41 reference statements)

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“…We hypothesize that cathodic corrosion could also be used to incorporate dopants for increasing the visible light response of the resulting nanoparticles. Certain dopants have already been shown in the literature to red shift the band edge of WO 3 , [36][37][38] and could bolster the visible activity of H 2 WO 4 particles.…”

Section: Electrochemical Characterizationmentioning

confidence: 99%

High-Throughput Preparation of Metal Oxide Nanocrystals by Cathodic Corrosion and Their Use as Active Photocatalysts

et al. 2017

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Nanoparticle metal oxide photocatalysts are attractive because of their increased reactivity and ease of processing into versatile electrode formats; however, their preparation is cumbersome. We report on the rapid bulk synthesis of photocatalytic nanoparticles with homogeneous shape and size via the cathodic corrosion method, a simple electrochemical approach applied for the first time to the versatile preparation of complex metal oxides. Nanoparticles consisting of tungsten oxide (HWO) nanoplates, titanium oxide (TiO) nanowires, and symmetric star-shaped bismuth vanadate (BiVO) were prepared conveniently using tungsten, titanium, and vanadium wires as a starting material. Each of the particles were extremely rapid to produce, taking only 2-3 min to etch 2.5 mm of metal wire into a colloidal dispersion of photoactive materials. All crystalline HWO and BiVO particles and amorphous TiO were photoelectrochemically active toward the water oxidation reaction. Additionally, the BiVO particles showed enhanced photocurrent in the visible region toward the oxidation of a sacrificial sulfite reagent. This synthetic method provides an inexpensive alternative to conventional fabrication techniques and is potentially applicable to a wide variety of metal oxides, making the rapid fabrication of active photocatalysts with controlled crystallinity more efficient.

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Section: Electrochemical Characterizationmentioning

confidence: 99%

High-Throughput Preparation of Metal Oxide Nanocrystals by Cathodic Corrosion and Their Use as Active Photocatalysts

et al. 2017

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“…4.5 eV),

E_{g}

is the calculated band gap from the DRS and

E_{C B}

is the conduction band edge. The electronegativity value of CdS and WO 3 were 5.18 and 6.59, respectively ,. The VB and CB potentials of CdS were 1.57 and –0.21 eV, respectively, while CB and VB potentials for WO 3 were 3.32 and 0.86 eV, respectively.…”

Section: Resultsmentioning

confidence: 94%

“…The electronegativity value of CdS and WO 3 were 5.18 and 6.59, respectively. [27,56] The VB and CB potentials of CdS were 1.57 and -0.21 eV, respectively, while CB and VB potentials for WO 3 were 3.32 and 0.86 eV, respectively. Finally, a schematic illustration of the charge carrier migration and separation in the CdS-WO 3 nanocomposite was proposed ( Figure 15).…”

Section: Photocatalytic Degradation Mechanismmentioning

confidence: 96%

Application of Z–Scheme CdSWO₃ Nanocomposite for Photodegradation of Ethylparaben under Irradiation with Visible Light: A Combined Experimental and Theoretical Study

et al. 2018

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The CdS- WO3 nanocomposite was successfully synthesized using the hydrothermal method. The catalytic capacity of CdS- WO3 nanocomposite was evaluated based on various parameters, such as pH, catalyst load, bicarbonate and persulfate concentrations. The ratios of CdS to WO3 was also examined to acquire the photocatalytic performance in addition, the by–products and pathway were also studied. The findings showed that CdS- WO3 (ratio 3:7) produced better photodegradation performance in comparison to CdS- WO3 (ratio 1:1). Also, from the same investigation, the CdS- WO3 nanocomposite exhibited a slightly higher catalytic ability in the presence of 150 mg L–1 S2O82– ions (at pH 3) than with bicarbonate ions. A 40% degradation was observed in the presence of 150 mg L–1 S2O82– ions (at pH 3). Moreover, about 38% of adsorption was observed with bicarbonate ions. In this study, we systematically reveal the underlying mechanism of the improved photoactivity of CdS–WO3 nanocomposite using a hybrid density functional theory calculation. The interfacial interaction led to the formation of a built–in internal electric field at the CdS–WO3 interface to promote the separation of charge carriers, The theoretical results rationalise the experimental findings and offer a new understanding of the underlying mechanism of the photoactivity of CdS–WO3 nanocomposite. The degradation pathway of Ethylparaben, which involved dealkylation of ethyl unit was proposed.

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“…Between the two, sulfur‐rich CuS (also known as covellite mineral) has become an important p‐type semiconductor material due to its narrow bandgap (∼2.2 eV) and potential application value as a co‐catalyst. In addition, CuS is a well‐known candidate material for visible‐light photocatalysis since it owns an additional absorption band in the near‐infrared region (NIR), which allows it to exhibit low reflectance in the visible range and a rather high reflectance in the NIR . However, the improvement and development of this semiconductor material towards practical application is limited due to the fast recombination of the photogenerated electron‐hole pairs of CuS.…”

Section: Fundamentals Of Metal Sulfidesmentioning

confidence: 99%

Hollow Structured Metal Sulfides for Photocatalytic Hydrogen Generation

et al. 2020

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Metal sulfides (MSs) are a promising class of materials for photocatalytic hydrogen generation due to their distinct features of photosensitivity, electrical conductance, and photoelectrochemical stability. However, the photocatalytic activity of solid structured MSs is often compromised due to low incident photon absorption, high charge carrier recombination, inadequate catalytic active sites, and slow mass and charge diffusion. The development of hollow structured MSs alleviates these limitations and achieves higher H2 generation than solid structured counterparts. This minireview aims to review the recent advances in the development of synthetic methods for various hollow structured MSs that are designed to enhance light absorption and fasten mass diffusion. Particularly, this report highlights the advent of sophisticated heterostructured hollow MSs for the application in photocatalysis, in which the formation of heterojunction at the semiconductor interface ensures spatial separation of charge carriers. The synergy between the hollow structure and heterostructure dramatically increases the H2 generation rate by providing increased light absorption, delayed charge recombination, and accelerated mass diffusion. We also point to potentially fruitful research directions in this field, in hope that this minireview serves as a stepping stone for the future development in hollow MSs for photocatalytic applications and beyond.

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Synthesis and characterization of a CuS–WO₃ composite photocatalyst for enhanced visible light photocatalytic activity

Cited by 137 publications

References 35 publications

High-Throughput Preparation of Metal Oxide Nanocrystals by Cathodic Corrosion and Their Use as Active Photocatalysts

High-Throughput Preparation of Metal Oxide Nanocrystals by Cathodic Corrosion and Their Use as Active Photocatalysts

Application of Z–Scheme CdSWO₃ Nanocomposite for Photodegradation of Ethylparaben under Irradiation with Visible Light: A Combined Experimental and Theoretical Study

Hollow Structured Metal Sulfides for Photocatalytic Hydrogen Generation

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Synthesis and characterization of a CuS–WO3 composite photocatalyst for enhanced visible light photocatalytic activity

Cited by 137 publications

References 35 publications

High-Throughput Preparation of Metal Oxide Nanocrystals by Cathodic Corrosion and Their Use as Active Photocatalysts

High-Throughput Preparation of Metal Oxide Nanocrystals by Cathodic Corrosion and Their Use as Active Photocatalysts

Application of Z–Scheme CdSWO3 Nanocomposite for Photodegradation of Ethylparaben under Irradiation with Visible Light: A Combined Experimental and Theoretical Study

Hollow Structured Metal Sulfides for Photocatalytic Hydrogen Generation

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Synthesis and characterization of a CuS–WO₃ composite photocatalyst for enhanced visible light photocatalytic activity

Application of Z–Scheme CdSWO₃ Nanocomposite for Photodegradation of Ethylparaben under Irradiation with Visible Light: A Combined Experimental and Theoretical Study