Effect of oxygen vacancies on the dielectricity of Ga doped equimolar BiMnO3–BaTiO3 characterized by XPS analysis

Rahangdale, Khushbu K.; Ganguly, Subhas

doi:10.1016/j.physb.2021.413570

Cited by 15 publications

(4 citation statements)

References 44 publications

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“…The XPS spectra of the Fe-based catalysts revealed the presence of two distinct peaks within the ranges of 529.46–529.97 and 530.86–531.51 (Figure ). The lower binding energy corresponded to the lattice oxygen of the iron substance, while the higher binding energy signified the presence of oxygen vacancies . The observation aligned with the findings of Biesinger et al, who stated that the second higher binding energy peak in pure oxide mainly stood for defective oxide instead of hydroxide.…”

Section: Results and Discussionsupporting

confidence: 87%

Product Selection Toward High-Value Hydrogen and Bamboo-Shaped Carbon Nanotubes from Plastic Waste by Catalytic Microwave Processing

Li,

Chen,

Lin

et al. 2024

Environ. Sci. Technol.

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The escalating levels of plastic waste and energy crises underscore the urgent need for effective waste-to-energy strategies. This study focused on converting polypropylene wastes into high-value products employing various iron-based catalysts and microwave radiative thermal processing. The Al−Fe catalysts exhibited exceptional performance, achieving a hydrogen utilization efficiency of 97.65% and a yield of 44.07 mmol/g PP. The gas yields increased from 19.99 to 94.21 wt % compared to noncatalytic experiments. Furthermore, this catalytic system produced high-value bamboo-shaped carbon nanotubes that were absent in other catalysts. The mechanism analysis on catalytic properties and product yields highlighted the significance of oxygen vacancies in selecting high-value products through two adsorption pathways. Moreover, the investigation examined the variations in product distribution mechanisms between conventional and microwave pyrolysis, in which microwave conditions resulted in 4 times higher hydrogen yields. The technoeconomic assessment and Monte Carlo risk analysis further compared the disparity. The microwave technique had a remarkable internal rate of return (IRR) of 39%, leading to an income of $577/t of plastic with a short payback period of 2.5 years. This research offered sustainable solutions for the plastic crisis, validating the potential applicability of commercializing the research outcomes in real-world scenarios.

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Section: Results and Discussionsupporting

confidence: 87%

Product Selection Toward High-Value Hydrogen and Bamboo-Shaped Carbon Nanotubes from Plastic Waste by Catalytic Microwave Processing

Li,

Chen,

Lin

et al. 2024

Environ. Sci. Technol.

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“…However, the binding energy of O 1s deviates to a higher value, indicating a difference in oxygen vacancy concentration between the undoped and La‐doped BaTiO 3 nanoparticle films. [ 14 ]…”

Section: Resultsmentioning

confidence: 99%

“…However, the binding energy of O 1s deviates to a higher value, indicating a difference in oxygen vacancy concentration between the undoped and Ladoped BaTiO 3 nanoparticle films. [14] The optical transmission spectra indicate that La doping does not appreciably influence the transmittance of nano particle films (Figure S2a, Supporting Information). We then investigated the effect of La doping on the EO performance of Ba 1−x La x TiO 3 nanoparticle films.…”

Section: Introductionmentioning

confidence: 99%

Engineering Electro‐Optic BaTiO₃ Nanocrystals via Efficient Doping

et al. 2022

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minimizing power consumption. Photonic nanostructures and thin films are prime candidates to meet these requirements.Barium titanate (BaTiO 3 ) is a ferro electric with a large Pockels coefficient, low optical loss, and fast response. [3] However, it remains challenging to integrate the BaTiO 3 materials with photonic structures on a single chip because of the mismatch of the crystal properties with the photonic structure, which renders attempts at heter ogenous integration costly and complex.BaTiO 3 nanoparticles, processed from solution, allow uniform films to be inte grated onto photonic structures via wet deposition methods, such as spin coating, drop casting, and spray pyrolysis, thereby simplifying the manufacturing process of onchip EO modulators. [4] When the particle size is reduced in this way, how ever, a lower EO response is seen. [5] We investigated whether doping could overcome the limitations of solutionprocessed ABO 3 perov skite nanoparticles such as BaTiO 3 . [6] Rareearth ions such as La 3+ and Er 3+ have been used to substitute the Ba site as donors, while transition metals Mn 2+ and Ni 2+ favor the Ti site as accep tors. Both donor and acceptor doping have been studied in view of their potential to improve the dielectric constant and spontaneous polarization. [7] Since EO response is proportional to spontaneous polarization and dielectric constant, [8] doping appears to have the potential to enhance EO. Results and DiscussionWe used an ethanol dispersion with 20 wt% of BaTiO 3 nano particles to fabricate films (Experimental Section). The average nanoparticle diameter is 200 nm, sufficient to support the tetragonal phase. [9] We used atomic force microscopy (AFM) to measure the surface topography and thickness of the BaTiO 3 nanoparticle films: this revealed a thickness of 700 nm and a rootmeansquare of 25 nm (Figure S1, Supporting Information). The optical transmission spectra of the BaTiO 3 nano particle films were recorded using a UV-vis-NIR (near infrared) spectrometer (Figure S2a, Supporting Information). Spincast films exhibit transmission of 85% in the wavelength range between 400 and 2000 nm. The refractive index of the Electro-optic (EO) modulators provide electrical-to-optical signal conversion relevant to optical communications. Barium titanate (BaTiO 3 ) is a promising material system for EO modulation in light of its optical ultrafast nonlinearity, low optical loss, and high refractive index. To enhance further its spontaneous polarization, BaTiO 3 can be doped at the Ba and Ti sites; however, doping is often accompanied by ion migration, which diminishes EO performance. Here, donor-acceptor doping and its effect on EO efficiency are investigated, finding that La-doped BaTiO 3 achieves an EO coefficient of 42 pm V −1 at 1 kHz, fully twice that of the pristine specimen; however, it is also observed that, with this single-element doping, the EO response falls off rapidly with frequency. From impedance spectroscopy, it is found that frequency-dependent EO is correlated with ion mig...

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“…Meanwhile, the XPS results indicate that the concentrations of both Mn 3+ and surface oxygen vacancies increase, which implies that the volatilization of Bi leads to the partial change from Mn 4+ to Mn 3+ and generation of oxygen vacancies to maintain electrical neutrality. 45,46 When the sintering temperature rises to 900 °C, the volatilization of the Bi element tends to be gentle based on ICP-MS results, and no second phase occurs in the 900 °C-sintered Bi 2 Mn 4 O 10 . The morphologies of Bi 2 Mn 4 O 10 particles in Figure 3 change from rough surfaces to cubic with smoother step-like surfaces with particle growth, suggesting lower surface energy.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Promoted Carbon Monoxide Sensing Performance of a Bi₂Mn₄O₁₀-Based Mixed-Potential Sensor by Regulating Oxygen Vacancies

Wang

et al. 2022

ACS Sens.

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The YSZ-based mixed-potential sensor has exhibited promising application prospects for in situ carbon monoxide (CO) monitoring owing to its excellent thermal stability. However, the way to further enhance the sensitivity and selectivity of the sensor remains challenging due to the limitation of the sensing material. In the present work, we proposed a strategy of introducing moderate oxygen vacancies in the transition metal oxide sensing material to enhance CO sensing performance. More importantly, the oxygen vacancies of the sensing electrode were regulated by adjusting the volatilization of the Bi element at different sintering temperatures. Meanwhile, the stable mullite structure and variable valency of Mn were also exploited to maintain the phase structure stability and charge balance brought by the loss of Bi. The relationship between CO sensing properties and the proportion of both Mn3+/Mn4+ and oxygen vacancies was elucidated from XPS and EIS measurements. By contrast, the 800 °C-sintered Bi2Mn4O10 possesses the highest oxygen vacancy content and thus exhibits preferable sensing performance including a lower detecting limit (10 ppm), swifter response/recovery processes, and enhanced CO sensitivity (−70.47 mV/decade operated at 450 °C) with satisfactory selectivity and stability, indicating a promising prospect for CO monitoring under exhaust environments.

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Effect of oxygen vacancies on the dielectricity of Ga doped equimolar BiMnO3–BaTiO3 characterized by XPS analysis

Cited by 15 publications

References 44 publications

Product Selection Toward High-Value Hydrogen and Bamboo-Shaped Carbon Nanotubes from Plastic Waste by Catalytic Microwave Processing

Product Selection Toward High-Value Hydrogen and Bamboo-Shaped Carbon Nanotubes from Plastic Waste by Catalytic Microwave Processing

Engineering Electro‐Optic BaTiO₃ Nanocrystals via Efficient Doping

Promoted Carbon Monoxide Sensing Performance of a Bi₂Mn₄O₁₀-Based Mixed-Potential Sensor by Regulating Oxygen Vacancies

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Effect of oxygen vacancies on the dielectricity of Ga doped equimolar BiMnO3–BaTiO3 characterized by XPS analysis

Cited by 15 publications

References 44 publications

Product Selection Toward High-Value Hydrogen and Bamboo-Shaped Carbon Nanotubes from Plastic Waste by Catalytic Microwave Processing

Product Selection Toward High-Value Hydrogen and Bamboo-Shaped Carbon Nanotubes from Plastic Waste by Catalytic Microwave Processing

Engineering Electro‐Optic BaTiO3 Nanocrystals via Efficient Doping

Promoted Carbon Monoxide Sensing Performance of a Bi2Mn4O10-Based Mixed-Potential Sensor by Regulating Oxygen Vacancies

Contact Info

Product

Resources

About

Engineering Electro‐Optic BaTiO₃ Nanocrystals via Efficient Doping

Promoted Carbon Monoxide Sensing Performance of a Bi₂Mn₄O₁₀-Based Mixed-Potential Sensor by Regulating Oxygen Vacancies