Oxygen vacancy

In this work, we have shown that the addition of Zn to nanocrystalline nickel ferrite enhanced its H2 sensing properties, such as sensitivity, response time, and stability. This is explained due to the formation of defects and oxygen vacancies in the crystal structure due to the substitution of Zn ions in place of Ni ions. These defects generated more active sites for H2 gas to interact with, resulting in improved sensing performance.

9p viambani 18-06-2024 1 1   Download

This review covers recent advances in the synthesis of cerium dioxide, its properties, and potential applications. Cerium dioxide is known for its abilities to form surface vacancies, store and release oxygen, as well as to increase the thermal stability of the material by metal-Ce interactions, etc.

11p viberbers 09-08-2023 4 3   Download

Z-scheme Ag2WO4/BiOBr heterojunction with rich oxygen vacancies was successfully synthesized by the simplest hydrothermal method, which was systematically characterized in the structural, optical and electronic properties. The photocatalytic applications of Z-scheme Ag2WO4/BiOBr heterostructure with different weight percentages of Ag2WO4 were studied.

12p viberbers 09-08-2023 5 3   Download

In this study, trivalent La and Y, which feature large solubility limits of more than 20 at% in CeO2, are selected as dopants, and the transfer energy of the oxygen vacancy according to the change in the lattice constant of CeO2 is investigated.

5p viberbers 09-08-2023 5 3   Download

A green sol-gel method was employed to synthesize TiO2 nanoparticles (NPs) using titanium metal. The synthesized TiO2 NPs underwent comprehensive characterization using techniques including X-ray diffraction (XRD), infrared spectroscopy (IR), transmission electron microscopy (TEM), and UV–Vis diffuse reflectance spectroscopy (UV-Vis DRS) to evaluate their structure, morphology, and spectral properties.

9p viwolverine 07-07-2023 5 2   Download

A low field benchtop electron spin resonance (ESR) (also referred to as electron paramagnetic resonance (EPR)) spectrometer is used to reveal paramagnetic centres such as oxygen vacancies and Ti+3 centres over 0.5%Pd/TiO2 . The measurement was performed at room temperature after the sample was reduced in situ under mild hydrogen pressures and evacuated to P < 10–6 Torr.

8p lyhuyenthu 31-01-2023 7 2   Download

Energy storage by supercapacitors with short charging time and high power density is one of the types of electrochemical storage systems. Perovskite oxides have been significantly investigated as promising materials for energy storage in electrochemical systems. In this study, three perovskites, SrFeO3, SrCoO3 , and SrCo0.5Fe0.5O3, were prepared using the sol-gel method and used as supercapacitor electrode materials.

10p lyhuyenthu 31-01-2023 3 1   Download

In addition, the effect of La1-xSrxCoO3 powders on the photocatalytic degradation of methylene blue and CO2 reduction reaction under UV light source was also investigated. The results showed a maximum photocatalytic degradation of methylene blue 30 ppm could be achieved with a degradation degree of 11.32% by La0.6Sr0.4CoO3 synthesized at 850oC for 4h (LSC64-850) in UV light for 150 min.

4p vijaguar 16-11-2022 11 1   Download

Effect of dopant on structural and electrical properties of samarium-doped ceria (SDC) electrolyte was investigated using statistical moment method. Our results showed the lattice expansion due to doping and local distortion resulting from preferential distribution of oxygen vacancies around dopants.

11p vimelindagates 18-07-2022 11 3   Download

The resistive switching effect was observed with the ON/OFF ratio of 0.5102 , high endurance, excellent retention and the electrical transport mechanisms were followed by the SCLC and Ohmic’s law in the low resistance state and FlowerNordheim tunneling in the high resistance state. The resistive switching mechanism was contributed by the oxygen vacancies in ZnO nanoparticles and the oxygen ions in the bottom electrode.

11p meyerowitz 25-12-2021 7 0   Download

The bombardment with argon ions of the studied films leads to oxygen vacancy generation in the near-surface layer. The oxygen vacancy concentrations in the bombarded films were evaluated from the comparison of experimental valence band photoelectron spectra with the theoretical ones calculated using the density functional theory.

6p meyerowitz 25-12-2021 9 0   Download

Herein, titanium (Ti3+) self-doped strontium titanate (SrTiO3), so-called blue SrTiO3, with a bandgap of 2.6 eV and favorable photocatalytic characteristics was fabricated through a facile and effective method. For electrochemical investigations, the electrophoretic deposition was applied to produce SrTiO3 thin films on (fluorine-doped tin oxide) FTO conductive substrates. The electrophoretic voltage of 20V and a process duration of 10 min were optimized to reach transparent and uniform coatings on FTO. The blue SrTiO3 reveals lower resistance (charge transfer resistance of 6.

10p tudichquannguyet 29-11-2021 3 1   Download

In order to understand the photocatalytic mechanisms of N-doped TiO2 with different doping positions of N, this research performed ab-initio calculations based on density functional theory (DFT) without and with Hubbard U correction, concentrate on the electronic structure of the materials.

8p tamynhan9 02-12-2020 19 1   Download

Oxygen vacancy diffusion in yttria-doped ceria (YDC) and yttria-stabilized zirconia (YSZ) are investigated using statistical moment method, including the anharmonicity effects of thermal lattice vibrations. The expressions of oxygen vacancy-dopant association energy and oxygen vacancy migration energy are derived in an explicit form.

14p viaphrodite2711 14-10-2019 8 0   Download

The result of magnetization measurements showed that the magnetization at a magnetic field as high as 1 T abnormally depends on x, increases with increasing x to a maximum at x=0.1 then decreases monotonously afterward. There are possibilities to account for this anomalous magnetic behavior such as the Fe3+-to-Fe4+ and/or Ti4+-to-Ti3+ change(s) induced by oxygen vacancies. The substitution of Fe into Ti sites also changes the conductivity of the material and impurity (acceptor) levels in the band gap.

6p cumeo2425 02-07-2018 27 0   Download