Chemoresistive gas-sensing properties of highly dispersed Nb2O5 obtained by programmable precipitation

Mokrushin, Artem S.; Simonenko, Tatiana L.; Симоненко, Н. П.; Gorobtsov, Philipp Yu.; Kadyrov, Nail C.; Simonenko, Elizaveta P.; Sevastyanov, V. G.; Кузнецов, Н. Т.

doi:10.1016/j.jallcom.2021.159090

Cited by 32 publications

(15 citation statements)

References 60 publications

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“…In this sense, the Nb 4+ oxidation state from NbO 2 under O 2 deficiency allows the formation of substitution defects in the Nb 2 O 5 structure. Additionally, reducing Nb 5+ to Nb 4+ can influence the electron production in the catalytic sites and favor the formation of products, such as CH 4 before the site deactivation from the niobium oxidation to the 5+ state [43].…”

Section: Photocatalytic Conversion Of Comentioning

confidence: 99%

Preparation and Application of Nb2O5 Nanofibers in CO2 Photoconversion

et al. 2021

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Increasing global warming due to NOx, CO2, and CH4, is significantly harming ecosystems and life worldwide. One promising methodology is converting pollutants into valuable chemicals via photocatalytic processes (by reusable photocatalysts). In this context, the present work aimed to produce a Nb2O5 photocatalyst nanofiber system by electrospinning to convert CO2. Based on the collected data, the calcination at 600 ∘C for 2 h resulted in the best condition to obtain nanofibers with homogeneous surfaces and an average diameter of 84 nm. As a result, the Nb2O5 nanofibers converted CO2 mostly into CO and CH4, reaching values around 8.5 μmol g−1 and 0.55 μmol g−1, respectively.

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Section: Photocatalytic Conversion Of Comentioning

confidence: 99%

Preparation and Application of Nb2O5 Nanofibers in CO2 Photoconversion

et al. 2021

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“…As discussed above, pentavalent Nb at the surface would either affect the reactivity of adsorbed oxygen bound to it or influence the receptive properties of the oxygen adsorbed to neighboring Ti and Sn atoms. Since Nb oxides do not possess qualified properties vs H 2 detection, 64 evidently the presence of Nb strengthens the reactivity of neighboring sites. This would explain the improved sensing of STN 1.5 650.…”

Section: Discussionmentioning

confidence: 99%

Design of a Metal-Oxide Solid Solution for Sub-ppm H₂ Detection

et al. 2022

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Hydrogen is largely adopted in industrial processes and is one of the leading options for storing renewable energy. Due to its high explosivity, detection of H 2 has become essential for safety in industries, storage, and transportation. This work aims to design a sensing film for high-sensitivity H 2 detection. Chemoresistive gas sensors have extensively been studied for H 2 monitoring due to their good sensitivity and low cost. However, further research and development are still needed for a reliable H 2 detection at sub-ppm concentrations. Metal-oxide solid solutions represent a valuable approach for tuning the sensing properties by modifying their composition, morphology, and structure. The work started from a solid solution of Sn and Ti oxides, which is known to exhibit high sensitivity toward H 2 . Such a solid solution was empowered by the addition of Nb, which—according to earlier studies on titania films—was expected to inhibit grain growth at high temperatures, to reduce the film resistance and to impact the sensor selectivity and sensitivity. Powders were synthesized through the sol–gel technique by keeping the Sn–Ti ratio constant at the optimal value for H 2 detection with different Nb concentrations (1.5–5 atom %). Such solid solutions were thermally treated at 650 and 850 °C. The sensor based on the solid solution calcined at 650 °C and with the lowest content of Nb exhibited an extremely high sensitivity toward H 2 , paving the way for H 2 ppb detection. For comparison, the response to 50 ppm of H 2 was increased 6 times vs SnO 2 and twice that of (Sn,Ti) x O 2 .

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“…XPS spectra were operated using Al Kα radiation (E = 1486.6 eV). All the binding energies were calibrated with respect to the C 1s peak at 284.8 eV [31].…”

Section: X-ray Photoelectron Spectroscopy (Xps)mentioning

confidence: 99%

Impact of Digestion on Surface Microstructures of Microplastics

Chen

Liu

et al. 2021

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Recently, there have been more reports and concerns about microplastics from various media and journals in the world. Except for land and water pollutions, much attention has been given to the impact of microplastics on animal and human health. However, previous studies have shown that digestion could not affect the particles of various microplastics due to their stable behavior. This work focuses on the impact of artificial digestion on the surface microstructures of microplastics from well recognized popular sources such as PP, PE, PET, PS and PVC. SEM and AFM were used to study the impact of artificial digestion on the surface morphologies of microplastics; while ATR-FTIR and XPS were used to investigate the impact of artificial digestion on the chemical properties of the surface of the microplastics. There were no physical differences observed by both SEM and AFM. There were no significant chemical differences detected by both FTIR and XPS after treatment. The slight differences of resolved C1s spectra for PS and PET samples detected by XPS should be further investigated. The study results show that the digestion system could not decompose the microplastics. Generally, plastic particles are widely considered to be inert due to their low chemical reactivity.

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Chemoresistive gas-sensing properties of highly dispersed Nb2O5 obtained by programmable precipitation

Cited by 32 publications

References 60 publications

Preparation and Application of Nb2O5 Nanofibers in CO2 Photoconversion

Preparation and Application of Nb2O5 Nanofibers in CO2 Photoconversion

Design of a Metal-Oxide Solid Solution for Sub-ppm H₂ Detection

Impact of Digestion on Surface Microstructures of Microplastics

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Chemoresistive gas-sensing properties of highly dispersed Nb2O5 obtained by programmable precipitation

Cited by 32 publications

References 60 publications

Preparation and Application of Nb2O5 Nanofibers in CO2 Photoconversion

Preparation and Application of Nb2O5 Nanofibers in CO2 Photoconversion

Design of a Metal-Oxide Solid Solution for Sub-ppm H2 Detection

Impact of Digestion on Surface Microstructures of Microplastics

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Product

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Design of a Metal-Oxide Solid Solution for Sub-ppm H₂ Detection