Optical properties and photocatalytic activities of tungsten oxide (WO3) with platinum co-catalyst addition

Widiyandari, Hendri; Firdaus, Iqbal; Kadarisman, Vincencius Gunawan Slamet; Purwanto, Agus

doi:10.1063/1.4941910

Cited by 14 publications

(7 citation statements)

References 8 publications

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“…The gap energy values for the WO 3 sample and for the series doped with Pr 3+ showed very close values and in accordance with the results found in the literature, 66 with a subtle decrease when Pr 3+ was incorporated into the WO 3 host matrix. The determination of the band gap value is an estimate that considers an average of the band gap of each face that constitutes the morphology of the particles.…”

Section: Resultssupporting

confidence: 90%

“…This performance presented by WO 3 is in agreement with other studies in the literature. 66,68 It is reasonable to consider that the photon emission process is due to multiple relaxation processes with the participation of different energy levels. Associated with this behavior, it is possible to consider the existence of defects and structural distortions and their densities, which enable the formation of sites for trapping the e − /h + charges, demanding an increase in the recombination rate and an increase in the intensity of photoluminescence.…”

Section: Photodegradation Of Crystal Violetmentioning

confidence: 99%

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Synthesis of Pr³⁺-doped WO₃ particles: correlation between photoluminescent and photocatalytic properties

Lovisa,

dos Santos,

Santiago

et al. 2023

RSC Adv.

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Section: Resultssupporting

confidence: 90%

Section: Photodegradation Of Crystal Violetmentioning

confidence: 99%

Synthesis of Pr³⁺-doped WO₃ particles: correlation between photoluminescent and photocatalytic properties

Lovisa,

dos Santos,

Santiago

et al. 2023

RSC Adv.

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“…In reality, this is hardly achievable, but some transition metal oxides have a combination of properties that make them prime candidates for PEC catalysis. WO 3 is one of these materials, as it has a band gap of ~2.7 eV, which can be further lowered by tuning the synthesis conditions or creating heterostructures with other materials [6][7][8]. In addition, WO 3 is relatively stable under anodic conditions in acidic media, though it does undergo noticeable photo-corrosion in different electrolytes [9].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Synthesis of a WO3/MoSx Heterostructured Bifunctional Catalyst for Efficient Overall Water Splitting

et al. 2023

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Photo-/electrochemical water splitting can be a suitable method to produce “green” hydrogen and oxygen by utilizing renewable energy or even direct sunlight. In order to carry out photoelectrochemical (PEC) water splitting, a photoanode based on transition metal oxides, which absorbs photons and produces photoexcited electron–hole pairs, is needed. The positively charged holes can then participate in the water oxidation reaction. Meanwhile, a cathodic hydrogen evolution reaction (HER) can occur more efficiently with electrocatalytic materials that enhance the adsorption of H+, such as MoS2. In this study, it was shown that WO3/MoSx heterostructured materials can be synthesized by an electrochemical method called plasma electrolytic oxidation (PEO). During this process, many micro-breakdowns of the oxide layer occur, causing ionization of the oxide and electrolyte. The ionized mixture then cools and solidifies, resulting in crystalline WO3 with incorporated MoSx. The surface and cross-sectional morphology were characterized by SEM-FIB, and the coatings could reach up to 3.48 μm thickness. Inclusion of MoSx was confirmed by EDX as well as XPS. Synthesis conditions were found to have an influence on the band gap, with the lowest value being 2.38 eV. Scanning electrochemical microscopy was used to map the local HER activity and correlate the activity hotspots to MoSx’s content and surface topography. The bifunctional catalyst based on a WO3/MoSx heterostructure was evaluated for PEC and HER water-splitting activities. As a photoanode, it could reach up to 6% photon conversion efficiency. For HER in acidic media, a Tafel slope of 42.6 mV·dec−1 can be reached.

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“…Among SMOs, research on WO 3 ‐based acetone gas sensors is a hotspot due to their diverse chemical and physical structure. It is also known that WO 3 is an n‐type semiconductor, 19 which indicates an abundance of oxygen vacancies on its surface. Hence, these vacancies (adsorbent) greatly facilitate the chemisorption of target sensing gas, thereby improving the response time of the sensor.…”

Section: Introductionmentioning

confidence: 99%

Optimisation of H‐doped WO₃ synthesis at ambient conditions for potential acetone gas sensing

Tamelarasan,

Lo,

Muthoosamy

et al. 2023

Asia-Pacific J Chem Eng

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Tungsten trioxide (WO3) is a highly desired semiconductor metal oxide (SMO) to detect acetone gas which is present at high levels in the breath of diabetic patients. Current research in the biosensor field is focused on the synthesis of sensing material at room temperature to ease fabrication and reduce energy requirements for operations. In this context, hydrogen doping aids in increasing the baseline conductivity of WO3. Therefore, the current research aimed to synthesise H‐doped WO3 at ambient conditions via an ultrasonication‐assisted hydrogenation route. Besides, the independent effects of other factors on hydrogenation were studied. These include synthesis temperature (room temperature to 80°C) and zinc precursor loading (0.8 to 2.0). By varying the concentrations of WO3 for the synthesis, it was determined that the highest degree of hydrogenation was achieved at 10 mg/ml. This was indicated by a visible colour change to dark blue and the highest conductivity. The findings revealed that hydrogenation is less effective at higher temperatures. The most optimum zinc loading was found to be 1.6 where the maximum attainable conductivity was 116.1 mS/cm. This H‐doped WO3 sample was subsequently subjected to diluted acetone sensing performance. The sample showed a significant reduction in resistance towards diluted acetone of 1000 ppm compared to undoped WO3. Thus, findings from this work offer a potential room temperature‐based synthesis method for acetone detection at low concentration.

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Optical properties and photocatalytic activities of tungsten oxide (WO3) with platinum co-catalyst addition

Cited by 14 publications

References 8 publications

Synthesis of Pr³⁺-doped WO₃ particles: correlation between photoluminescent and photocatalytic properties

Synthesis of Pr³⁺-doped WO₃ particles: correlation between photoluminescent and photocatalytic properties

Electrochemical Synthesis of a WO3/MoSx Heterostructured Bifunctional Catalyst for Efficient Overall Water Splitting

Optimisation of H‐doped WO₃ synthesis at ambient conditions for potential acetone gas sensing

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Optical properties and photocatalytic activities of tungsten oxide (WO3) with platinum co-catalyst addition

Cited by 14 publications

References 8 publications

Synthesis of Pr3+-doped WO3 particles: correlation between photoluminescent and photocatalytic properties

Synthesis of Pr3+-doped WO3 particles: correlation between photoluminescent and photocatalytic properties

Electrochemical Synthesis of a WO3/MoSx Heterostructured Bifunctional Catalyst for Efficient Overall Water Splitting

Optimisation of H‐doped WO3 synthesis at ambient conditions for potential acetone gas sensing

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Product

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Synthesis of Pr³⁺-doped WO₃ particles: correlation between photoluminescent and photocatalytic properties

Synthesis of Pr³⁺-doped WO₃ particles: correlation between photoluminescent and photocatalytic properties

Optimisation of H‐doped WO₃ synthesis at ambient conditions for potential acetone gas sensing