Sr- and Co-doped LaGaO3−δ with high O2 and H2 yields in solar thermochemical water splitting

2019 ◽  
Vol 7 (11) ◽  
pp. 6099-6112 ◽  
Author(s):  
Zhenpan Chen ◽  
Qingqing Jiang ◽  
Feng Cheng ◽  
Jinhui Tong ◽  
Min Yang ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Water Splitting ◽  
Formation Energy ◽  
Vacancy Concentration ◽  
Perovskite Oxides ◽  
Oxygen Vacancy Concentration ◽  
High O2 ◽  
Solar Thermochemical ◽  
Co Doped

Sr- and Co-doped perovskite oxides La1−xSrxGa1−yCoyO3−δ (LSGC) with controllable oxygen vancancy formation energy (EV) and oxygen vacancy concentration (−) are successfully developed to exhibit high O2 and H2 yields when reduced at 1350 °C and re-oxidized at optimized 400−1100 °C.

Effect of Co-Doping Cation on Phase Stability of Zirconia Bioceramics in Hot Water

2007 ◽  
Vol 26-28 ◽  
pp. 773-776
Author(s):  
S. Yuhara ◽  
Yorinobu Takigawa ◽  
Tokuteru Uesugi ◽  
Kenji Higashi
Keyword(s):  
Binding Energy ◽  
Oxygen Vacancy ◽  
Phase Stability ◽  
Vacancy Concentration ◽  
Hot Water ◽  
Oxygen Vacancy Concentration ◽  
Zirconia Ceramics ◽  
Axis Ratio ◽  
Co Doping ◽  
Co Doped

Phase stability of cation co-doped zirconia ceramics is examined. As the result, in contrast to the result in small amount of single cation doped zirconia, phase stability of co-doped zirconia ceramics can not be simply explained from ionic radius and valency of dopant or from the change in axis ratio. We focus on oxygen vacancy concentration and binding energy between oxygen vacancy and doped cation. By estimating phase stability from these factors, it is found that concentration of oxygen vacancy and the binding energy between the dopant and the oxygen vacancy are important factors for understanding the phase stability of zirconia ceramics.

Oxygen-vacancy concentration in A2MgMoO6−δ double-perovskite oxides

2009 ◽  
Vol 182 (7) ◽  
pp. 1713-1716 ◽  
Author(s):  
Y. Matsuda ◽  
M. Karppinen ◽  
Y. Yamazaki ◽  
H. Yamauchi
Keyword(s):  
Oxygen Vacancy ◽  
Vacancy Concentration ◽  
Double Perovskite ◽  
Perovskite Oxides ◽  
Oxygen Vacancy Concentration

scholarly journals Effect of Oxygen Vacancy Concentration on the Photocatalytic Hydrogen Evolution Performance of Anatase TiO2: DFT and Experimental Studies

2021 ◽  
Author(s):  
Shufang Jia ◽  
Jiaqi Gao ◽  
Qianqian Shen ◽  
Jinbo Xue ◽  
Zhuxia Zhang ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Oxygen Vacancy ◽  
Water Splitting ◽  
Vacancy Concentration ◽  
Experimental Studies ◽  
Chemical Properties ◽  
Electron Transition ◽  
Partial Density ◽  
Oxygen Vacancy Concentration ◽  
Effect Of Oxygen

Abstract Oxygen vacancies (OVs) are important for changing the geometric and electronic structure as well as the chemical properties of anatase TiO2. In this work, we performed a DFT calculation on the electronic structure and catalytic performance of anatase TiO2 (101) with different numbers of OVs. A comparison of the measured XRD results with the simulated ones of TiO2 demonstrates that OVs can cause changes in the crystal structure. The changes in the electronic structure (Mulliken charges, band structure, and partial density of states) and water splitting on TiO2 (101) surfaces were investigated as a function of oxygen vacancy concentration. The results show that the introduction of oxygen vacancy forms impurity levels below the conduction band of Ti 3d orbitals, and electrons can gradually transit from VB to CB through the impurity levels. However, when oxygen vacancy concentration is too high, the maximum electron transition energy increases and the promotion effect of oxygen vacancy on water splitting is weakened. This work would provide more enlightenment and information for the design of defective TiO2 with higher photocatalytic activity.

scholarly journals Combined iDPC and EELS analyses for quantifying oxygen vacancy concentration in LSMO

2021 ◽  
Vol 27 (S1) ◽  
pp. 1196-1197
Author(s):  
Aubrey Penn ◽  
Sanaz Koohfar ◽  
Divine Kumah ◽  
James LeBeau
Keyword(s):  
Oxygen Vacancy ◽  
Vacancy Concentration ◽  
Oxygen Vacancy Concentration

scholarly journals Effects on Microstructure and Ionic Conductivity of the Co-Doping with Strontium and Samarium of Ceria with Constant Oxygen Vacancy Concentration

Solids ◽  
2021 ◽  
Vol 2 (4) ◽  
pp. 341-370
Author(s):  
Toby Sherwood ◽  
Richard T. Baker
Keyword(s):  
Oxygen Vacancy ◽  
Grain Boundary ◽  
Vacancy Concentration ◽  
Synthesis Method ◽  
Ionic Conductivities ◽  
Solubility Limit ◽  
Material Structure ◽  
Oxygen Vacancy Concentration ◽  
Co Doping ◽  
Phase Pure

Partially substituted cerias are attractive materials for use as electrolytes in intermediate-temperature solid oxide fuel cells (SOFCs). Ceria doped with Sm or Gd has been found to have high ionic conductivities. However, there is interest in whether doping with multiple elements could lead to materials with higher ionic conductivities. The present study looks at the effects of co-doping Sr and Sm in ceria. A compositional series, Ce0.8+xSm0.2−2xSrxO2−δ (with x = 0–0.08), designed to have a constant oxygen vacancy concentration, was successfully prepared using the citrate–nitrate complexation method. A solubility limit of ~5 cation% Sr was found to impact material structure and conductivity. For phase-pure materials, with increasing Sr content, sinterability increased slightly and intrinsic conductivity decreased roughly linearly. The grain boundaries of phase-pure materials showed only a very small blocking effect, linked to the high-purity synthesis method employed, while at high %Sr, they became more blocking due to the presence of a SrCeO3 impurity. Grain capacitances were found to be 50–60 pF and grain boundary capacitances, 5–50 nF. The variation in the bulk capacitance with Sr content was small, and the variation in grain boundary capacitance could be explained by the variation in grain size. Slight deviations at high %Sr were attributed to the SrCeO3 impurity. In summary, in the absence of deleterious effects due to poor microstructure or impurities, such as Si, there is no improvement in conductivity on co-doping with Sr and Sm.

Magnetic State of Ba-Doped Manganites Depending on the Oxygen Vacancy Concentration

2002 ◽  
Vol 233 (2) ◽  
pp. 321-330 ◽  
Author(s):  
S.V. Trukhanov ◽  
N.V. Kasper ◽  
I.O. Troyanchuk ◽  
H. Szymczak ◽  
K. B�rner
Keyword(s):  
Oxygen Vacancy ◽  
Magnetic State ◽  
Vacancy Concentration ◽  
Oxygen Vacancy Concentration ◽  
Doped Manganites

MECHANISM STUDY ON OXYGEN VACANCY INDUCED RESISTANCE SWITCHING IN Au/LaMnO3/SrNb0.01Ti0.99O3

2013 ◽  
Vol 27 (11) ◽  
pp. 1350074 ◽  
Author(s):  
YU-LING JIN ◽  
ZHONG-TANG XU ◽  
KUI-JUAN JIN ◽  
CHEN GE ◽  
HUI-BIN LU ◽  
...  
Keyword(s):  
Oxygen Vacancy ◽  
Oxygen Vacancies ◽  
Vacancy Concentration ◽  
Resistance Switching ◽  
Switching Behavior ◽  
Oxygen Vacancy Concentration ◽  
Mechanism Study ◽  
Switching Performance ◽  
Switching Characteristics

Mechanism of resistance switching in heterostructure Au / LaMnO 3/ SrNb 0.01 Ti 0.99 O 3 was investigated. In Au / LaMnO 3/ SrNb 0.01 Ti 0.99 O 3 devices the LaMnO 3 films were fabricated under various oxygen pressures. The content of the oxygen vacancies has a significant impact on the resistance switching performance. We propose that the resistance switching characteristics of Au / LaMnO 3/ SrNb 0.01 Ti 0.99 O 3 arise from the modulation of the Au / LaMnO 3 Schottky barrier due to the change of the oxygen vacancy concentration at Au / LaMnO 3 interface under the external electric field. The effect of the oxygen vacancy concentration on the resistance switching is explained based on the self-consistent calculation. Both the experimental and numerical results confirm the important role of the oxygen vacancies in the resistance switching behavior.

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