Evolution of Visible Photocatalytic Properties of Cu-Doped CeO2 Nanoparticles: Role of Cu2+-Mediated Oxygen Vacancies and the Mixed-Valence States of Ce Ions

2018 ◽  
Vol 6 (7) ◽  
pp. 8536-8546 ◽  
Author(s):  
Kugalur Shanmugam Ranjith ◽  
Chung-Li Dong ◽  
Ying-Rui Lu ◽  
Yu-Cheng Huang ◽  
Chi-Liang Chen ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Mixed Valence ◽  
Ceo2 Nanoparticles ◽  
Photocatalytic Properties ◽  
Valence States ◽  
Doped Ceo2

Role of oxygen vacancies in Ag/Au doped CeO2 nanoparticles for fast photocatalysis

Solar Energy ◽  
2018 ◽  
Vol 165 ◽  
pp. 206-216 ◽  
Author(s):  
Manish Mittal ◽  
Aayush Gupta ◽  
O.P. Pandey
Keyword(s):  
Oxygen Vacancies ◽  
Ceo2 Nanoparticles ◽  
Doped Ceo2

Rapid microwave-assisted hydrothermal synthesis of CeO2 octahedra with mixed valence states and their catalytic activity for thermal decomposition of ammonium perchlorate

2019 ◽  
Vol 6 (7) ◽  
pp. 1735-1743 ◽  
Author(s):  
Jing Shi ◽  
Huixiang Wang ◽  
Yequn Liu ◽  
Xiaobo Ren ◽  
Haizhen Sun ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Catalytic Activity ◽  
Hydrothermal Synthesis ◽  
Ammonium Perchlorate ◽  
Oxygen Vacancies ◽  
Mixed Valence ◽  
High Concentration ◽  
Microwave Assisted ◽  
Valence States

CeO2 octahedra are prepared rapidly and they exhibit improved catalytic activity due to high concentration of oxygen vacancies and exposed (111) facets.

Optical and photocatalytic properties of a ZnO@C core/shell sphere with rich oxygen vacancies

CrystEngComm ◽  
2020 ◽  
Vol 22 (31) ◽  
pp. 5245-5254 ◽  
Author(s):  
Qian Zhang ◽  
Xiaoru Zhao ◽  
Libing Duan ◽  
Hao Shen ◽  
Ruidi Liu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Oxygen Vacancies ◽  
Hydrothermal Reaction ◽  
Photocatalytic Properties ◽  
Core Shell ◽  
Novel Method ◽  
Carbon Core

We develop a novel method to prepare an oxygen-deficient ZnO@C core/shell based on a traditional hydrothermal reaction, and investigate the role of the carbon core and oxygen vacancies in the photocatalytic activity and photoluminescence processes.

The Dielectric Loss of Single Crystal and Polycrystalline TiO2

1997 ◽  
Vol 500 ◽  
Author(s):  
Xiaoru Wang ◽  
Alan Templeton ◽  
Stuart J. Penn ◽  
Neil McN. Alford
Keyword(s):  
Dielectric Loss ◽  
Single Crystal ◽  
Mixed Valence ◽  
Dielectric Materials ◽  
Oxygen Stoichiometry ◽  
Ion Conductor ◽  
Microwave Dielectric ◽  
Valence States ◽  
Oxygen Ion Conductor

ABSTRACTThe dielectric loss of single crystal and polycrystalline TiO2 has been studied. In polycrystalline TiO2 the dielectric loss is determined by both the microstructure and by the oxygen stoichiometry. Experiments have been carried out to determine the influence of both the microstructure (particularly porosity) and the oxygen stoichiometry. The TiO2 powder has been doped with partially stabilised zirconia, an oxygen ion conductor, in order to modify the oxygen stoichiometry. Sintered discs have been examined for loss as a function zirconia doping, pore volume and as a function of temperature. The behaviour of the doped and undoped titania powders is significantly different. Since many microwave dielectric materials contain Ti eg Ba-Ti-O, Ba-Nd-Ti-O, (Ba-RE-Ti-O, RE=Rare Earth), Zr-Sn-Ti-O etc it is essential to understand the role of the titanium, particularly as it can exist in mixed valence states, and the role of oxygen and its influence on the dielectric loss.

Toward a Unified Description of Luminescence–Local Structure Correlation in Ln Doped CeO2 Nanoparticles: Roles of Ln Ionic Radius, Ln Concentration, and Oxygen Vacancies

2015 ◽  
Vol 119 (28) ◽  
pp. 16303-16313 ◽  
Author(s):  
Daniel Avram ◽  
Margarita Sanchez-Dominguez ◽  
Bogdan Cojocaru ◽  
Mihaela Florea ◽  
Vasile Parvulescu ◽  
...  
Keyword(s):  
Local Structure ◽  
Ionic Radius ◽  
Oxygen Vacancies ◽  
Ceo2 Nanoparticles ◽  
Structure Correlation ◽  
Doped Ceo2 ◽  
Unified Description

Effects of Oxygen Vacancies and Cation Valence States on the Triboelectric Property of Substoichiometric Oxide Films

2021 ◽  
Author(s):  
Yongqiao Zhu ◽  
Shiquan Lin ◽  
Wenchao Gao ◽  
Miao Zhang ◽  
Chaogui Yang ◽  
...  
Keyword(s):  
Oxygen Vacancies ◽  
Oxide Films ◽  
Valence States

Cerium oxide nanomaterial with dual antioxidative scavenging potential: Synthesis and characterization

2021 ◽  
pp. 088532822110134
Author(s):  
Sushant Singh ◽  
Udit Kumar ◽  
David Gittess ◽  
Tamil S Sakthivel ◽  
Balaashwin Babu ◽  
...  
Keyword(s):  
Cerium Oxide ◽  
Biological Systems ◽  
Mixed Valence ◽  
Stable Solution ◽  
Ability To Act ◽  
Valence States ◽  
Transmission Electron ◽  
Efficient Reduction ◽  
Rich Media

Many studies have linked reactive oxygen species (ROS) to various diseases. Biomedical research has therefore sought a way to control and regulate ROS produced in biological systems. In recent years, cerium oxide nanoparticles (nanoceria, CNPs) have been pursued due to their ability to act as regenerative ROS scavengers. In particular, they are shown to have either superoxide dismutase (SOD) or catalase mimetic (CAT) potential depending on the ratio of Ce3+/Ce4+ valence states. Moreover, it has been demonstrated that SOD mimetic activity can be diminished by the presence of phosphate, which can be a problem given that many biological systems operate in a phosphate-rich environment. Herein, we report a CNP formulation with both SOD and catalase mimetic activity that is preserved in a phosphate-rich media. Characterization demonstrated a highly dispersed, stable solution of uniform-sized, spherical-elliptical shaped CNP of 12 ± 2 nm, as determined through dynamic light scattering, zeta potential, and transmission electron microscopy. Mixed valence states of Ce ions were observed via UV/Visible spectroscopy and XPS (Ce3+/Ce4+ > 1) (Ce3+∼ 62%). X-ray diffraction and XPS confirmed the presence of oxygen-deficient cerium oxide (CeO2-x) particles. Finally, the CNP demonstrated very good biocompatibility and efficient reduction of hydrogen peroxide under in-vitro conditions.

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