Facilitating room-temperature oxygen ion migration via Co-O bond activation in cobaltite films

Nanoscale ◽  
2021 ◽  
Author(s):  
Qian Wang ◽  
Youdi Gu ◽  
Siqi Yin ◽  
Yinming Sun ◽  
Wei Liu ◽  
...  

Oxygen ion migration in strongly correlated oxides can elicit dramatic changes in crystal structure, chemical and magnetoelectric properties, which holds promising for wide applications in catalysis, energy conversion, and electronics....

Author(s):  
Alexander M. Antipin ◽  
Olga A. Alekseeva ◽  
Natalia I. Sorokina ◽  
Alexandra N. Kuskova ◽  
Michail Yu. Presniakov ◽  
...  

The La2Mo2O9(LM) and Pr2Mo2O9(PM) single crystals are studied using precision X-ray diffraction and high-resolution transmission microscopy at room temperature. The crystal structures are determined in the space groupP213. La and Pr atoms, as well as Mo1 and O1 atoms, are located in the vicinity of the threefold axes rather than on the axes as in the high-temperature cubic phase. In both structures studied, the O2 and O3 positions are partially occupied. The coexistence of different configurations of the Mo coordination environment facilitates the oxygen-ion migration in the structure. Based on the X-ray data, the activation energies of O atoms are calculated and the migration paths of oxygen ions in the structures are analysed. The conductivity of PM crystals is close to that of LM crystals. The O2 and O3 atoms are the main contributors to the ion conductivity of LM and PM.


Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 5062
Author(s):  
Ivan S. Zhidkov ◽  
Azat F. Akbulatov ◽  
Liana N. Inasaridze ◽  
Andrey I. Kukharenko ◽  
Lyubov A. Frolova ◽  
...  

Measurements of XPS survey, core levels (N 1s, O 1s, Pb 4f, I 3d), and valence band (VB) spectra of CH3NH3PbI3 (MAPbI3) hybrid perovskite prepared on different substrates (glass, indium tin oxide (ITO), and TiO2) aged under different light-soaking conditions at room temperature are presented. The results reveal that the photochemical stability of MAPbI3 depends on the type of substrate and gradually decreases when glass is replaced by ITO and TiO2. Also, the degradation upon exposure to visible light is accompanied by the formation of MAI, PbI2, and Pb0 products as shown by XPS core levels spectra. According to XPS O 1s and VB spectra measurements, this degradation process is superimposed on the partial oxidation of lead atoms in ITO/MAPbI3 and TiO2/MAPbI3, for which Pb–O bonds are formed due to the diffusion of the oxygen ions from the substrates. This unexpected interaction leads to additional photochemical degradation.


2021 ◽  
Author(s):  
Jun-Ichiro Makiura ◽  
Takuma Higo ◽  
Yutaro Kurosawa ◽  
Kota Murakami ◽  
Shuhei Ogo ◽  
...  

Efficient activation of CO2 at low temperature was achieved by reverse water–gas shift via chemical looping (RWGS-CL) by virtue of fast oxygen ion migration in a Cu–In structured oxide, even at lower temperatures.


1989 ◽  
Vol 44 (12) ◽  
pp. 1167-1171 ◽  
Author(s):  
G. Chiodelli ◽  
G. Campari-Viganò ◽  
G. Flor

Abstract Electrical resistivity measurements were carried out on polycrystalline YBa2Cu3O7-x at temperatures 300 < T < 1023 K and oxygen partial pressures 5 ·10-7 ≤ po2 ≤ 1 atm. The samples, equilibrated in the range from 5 ·10-4 to 1 atm, show metallic behaviour, the one equilibrated at po2 = 2 ·10-5 shows a transition between metallic and semiconducting behaviour at 920 K, and that equilibrated at po2 = 5 ·10-7 shows semiconducting behaviour: for the latter the relevant resistivity is due to the oxygen-ion migration. The isotherms log σ vs. log po2 (in the temperature range from 723 to 1023 K) show slopes of about 1/6 at 723 K (orthorhombic phase) and about 1/2 at 1023 K (tetragonal phase). These results are discussed in terms of appropriate defect models.


2016 ◽  
Vol 120 (3) ◽  
pp. 1633-1639 ◽  
Author(s):  
Xiangjun Zhou ◽  
Yinuo Yan ◽  
Miao Jiang ◽  
Bin Cui ◽  
Feng Pan ◽  
...  

2020 ◽  
Author(s):  
Takuma Higo ◽  
Jun-Ichiro Makiura ◽  
Yutaro Kurosawa ◽  
Kota Murakami ◽  
Shuhei Ogo ◽  
...  

Efficient activation of CO<sub>2</sub> at low temperature was achieved by reverse water–gas shift <i>via</i> chemical looping (RWGS‑CL) by virtue of fast oxygen ion migration in Cu–In–structured oxide, even at lower temperatures. Results show that novel Cu–In<sub>2</sub>O<sub>3</sub> structured oxide can show a remarkably higher CO<sub>2</sub> splitting rate than ever reported. Various analyses revealed that RWGS‑CL on Cu–In<sub>2</sub>O<sub>3</sub> is derived from redox between Cu–In<sub>2</sub>O<sub>3</sub> and Cu<i><sub>x</sub></i>In<i><sub>y</sub></i> alloy. Key factors for high CO<sub>2</sub> splitting were fast migration of oxide ions in alloy and the preferential oxidation of the interface of alloy–In<sub>2</sub>O<sub>3</sub> in the bulk of the particles. The findings reported herein can open up new avenues to achieve effective CO<sub>2</sub> conversion at lower temperatures.


Nano Letters ◽  
2021 ◽  
Author(s):  
Qinghua Zhang ◽  
Fanqi Meng ◽  
Ang Gao ◽  
Xinyan Li ◽  
Qiao Jin ◽  
...  

2013 ◽  
Vol 71 (12) ◽  
pp. 1668 ◽  
Author(s):  
Guixiao Jia ◽  
Wenxing Hao ◽  
Fei Pan ◽  
Jichun Yang ◽  
Yongfan Zhang

Sign in / Sign up

Export Citation Format

Share Document