Article
Engineering, Chemical
Guoqiu Cai, Cong Luo, Ying Zheng, Dingshan Cao, Tong Luo, Xiaoshan Li, Fan Wu, Liqi Zhang
Summary: In this study, BaCoO3-delta perovskite oxide was proposed as an excellent oxygen carrier for chemical looping air separation (CLAS). The results showed that BaCoO3-delta had a large oxygen capacity and stable oxygen desorption performance, making it suitable for high-temperature gas separation technologies.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Chemistry, Physical
Sergey S. Nikitin, Alexey A. Markov, Ilia A. Leonidov, Mikhail Patrakeev
Summary: By thermodynamic analysis of defect equilibrium, the electrical conductivity of perovskite-type Sr1-xCexFeO3-δ was studied, showing a minor contribution of electrons localized on cerium ions to conductivity. An almost 10-fold decrease in ion conductivity was found with the increase of cerium content in Sr1-xCexFeO3-δ, attributed to a decrease in the mobility of oxygen ions, while having an insignificant effect on hole and electron conductivity.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Wenjie Yang, Huizhu Zhou, Ling Wang, Yuehua Li, Zhangxing He, Chao Han, Lei Dai
Summary: Perovskite proton conductors BaxZr0.6Hf0.2Y0.2O3-delta were successfully prepared by high temperature solid state method. Ba excess was found to enhance the sinterability and conductivity of the samples.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Biochemistry & Molecular Biology
Natalia Porotnikova, Dmitriy Zakharov, Anna Khodimchuk, Edhem Kurumchin, Denis Osinkin
Summary: This article investigates the oxygen exchange mechanism between the mixed ionic and electronic oxide LaNi0.6Fe0.4O3-delta and oxygen, using two isotopic methods. The kinetic dependence of the oxygen/oxide interaction is determined and the oxygen exchange rate and diffusion coefficient are calculated. The differences in the mechanisms of oxygen exchange and diffusion on dense and powder samples are discussed.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Jia Song, Shaochen Zhu, De Ning, Henny J. M. Bouwmeester
Summary: The structural evolution, electrical conductivity, oxygen nonstoichiometry, and oxygen transport properties of La1-xCaxFeO3-δ perovskite-type oxides were investigated. The results showed that Ca doping is mainly compensated by formation of electron holes rather than by oxygen vacancies, and oxygen vacancy diffusion coefficient and ionic conductivity increase with increasing Ca content in the compositions. The effective migration barrier for oxygen diffusion decreases with decreasing oxygen vacancy formation enthalpy.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Materials Science, Ceramics
Claudia Li, Jian Song, Shude Zhang, Xiaoyao Tan, Xiuxia Meng, Jaka Sunarso, Shaomin Liu
Summary: New CO2-resistant dual-phase SDC-SCFZ ceramics show potential for use in membrane reactors and solid oxide fuel cells, with the 25% SDC-75% SCFZ composition exhibiting the highest oxygen permeation fluxes and stability during operation at high temperatures.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Satoshi Hori, Ryoji Kanno, Ohmin Kwon, Yuki Kato, Takeshi Yamada, Masato Matsuura, Masao Yonemura, Takashi Kamiyama, Kaoru Shibata, Yukinobu Kawakita
Summary: Understanding the behavior of Li-ion conduction in superionic conductors is crucial for the development of new solid electrolytes and improvement of charge-discharge performances in all-solid-state batteries.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
Jiayue Wang, Jing Yang, Alexander Karl Opitz, Dmitri Kalaev, Andreas Nenning, Ethan J. Crumlin, Jerzy T. Sadowski, Iradwikanari Waluyo, Adrian Hunt, Harry L. Tuller, Bilge Yildiz
Summary: Understanding the surface defect chemistry and its strain dependency is crucial in developing next-generation electrochemical devices. This study constructed the strain-dependent surface defect equilibria of mixed ionic-electronic conducting perovskite oxides and investigated the effect of strain on the reducibility of the surfaces. The findings were validated by first principles calculations and thermodynamic analyses, providing a quantitative determination of the surface defect chemistry.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
Aleksei Yu. Grishko, Maria A. Komkova, Ekaterina I. Marchenko, Alexandra V. Chumakova, Alexey B. Tarasov, Eugene A. Goodilin, Andrei A. Eliseev
Summary: In this study, the electric field-induced transitions and degradation path of CH3NH3PbI3 (MAPbI(3)) were investigated using elemental and phase mapping. It was found that under the influence of an electric field, ion redistribution and phase transformation occur, leading to degradation of the MAPbI3 film. X-ray diffraction analysis revealed the electric field-induced phase transition. These findings provide insights into the degradation of perovskite materials and have implications for improving their stability.
Article
Chemistry, Multidisciplinary
Riddhimoy Pathak, Lin Xie, Subarna Das, Tanmoy Ghosh, Animesh Bhui, Kapildeb Dolui, Dirtha Sanyal, Jiaqing He, Kanishka Biswas
Summary: In this study, high thermoelectric performance with a zT value of 2.3 was achieved in Ag vacant Ag1-xSbTe2 by optimizing the atomic disorder rooted in the thermodynamic phase diagram. The formation of AgSbTe2 and the introduction of Ag vacancies reduced the disorder in the semiconductor crystal, leading to increased electrical conductivity and power factor, as well as reduced lattice thermal conductivity due to the formation of nanoscale superstructures.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Physics, Applied
Sayan Ghosh, C. Sudarshan, C. Sudakar
Summary: This study investigates how sintering conditions and grain boundary engineering can improve the ionic conductivity of LATP ceramics. By using Raman spectroscopy, the changes in vibrational mode characteristics of LATP ceramics with temperature are monitored, revealing the influence of sintering conditions on ionic migration and conductivity.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Ceramics
E. P. Kharitonova, E. Orlova, N. Gorshkov, V. G. Goffman, V. Voronkova
Summary: Cubic, tetragonal, and monoclinic solid solutions based on the Bi2O3 oxygen ion conductor have been successfully prepared in the ternary system Bi2O3-Nd2O3-WO3. Monoclinic compounds and Bi-poor cubic compounds show good thermal stability, while the cubic samples of the delta'-phase exhibit increased bulk conductivity with atmospheric humidity, suggesting their potential as proton conductors.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
A. V. Shlyakhtina, N. V. Lyskov, T. Salkus, A. Kezionis, M. V. Patrakeev, I. A. Leonidov, L. G. Shcherbakova, S. A. Chernyak, K. I. Shefer, E. M. Sadovskaya, N. F. Eremeev, V. A. Sadykov
Summary: In this study, new compounds of erbium and thulium molybdates were analyzed using various methods, revealing their different ionic conductivity in dry and wet environments, showing mixed oxygen-electronic conductors at high temperatures, and demonstrating that fluorites have higher oxygen ion mobility compared to bixbyites.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Biochemistry & Molecular Biology
Pierre-Alexis Repecaud, Monica Ceretti, Mimoun Aouine, Celine Delwaulle, Emmanuel Nonnet, Werner Paulus, Helena Kaper
Summary: The study investigates the impact of specific surface area on oxygen mobility and catalytic performance, showing significant differences in catalytic activity linked to long-term stability between CFO and SFO. The results highlight the importance of support material structure in catalytic performance and provide insights into the mechanism of catalytic activity.
Article
Materials Science, Multidisciplinary
Masashi Watanabe, Takayuki Seki
Summary: The effect of oxygen non-stoichiometry on the initial sintering behavior of CeO2 was studied, showing that the initial sintering of different compositions was controlled by grain boundary diffusion. The activation energies of cation diffusion were determined from the initial sintering data, suggesting a vacancy mechanism for cation diffusion.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2021)
