Article
Engineering, Electrical & Electronic
Ramesh Kumar Raji, Tholkappiyan Ramachandran, M. Muralidharan, R. Suriakarthick, M. Dhilip, A. Raja, K. Aravinth, S. Karthikeyan, P. Ramasamy, Vishista Kurapati, Fathalla Hamed, Abdel-Hamid Mourad
Summary: The substitution of Dy3+ ions in LaFeO3 materials has been investigated in this study, and its effects on the physical properties of the materials have been evaluated. It is found that the Dy3+ doping can alter the crystal structure, optical behavior, dielectric properties, and magnetic behavior of the materials. By tailoring the composition of La1-xDyxFeO3 materials, the properties can be controlled and customized.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Multidisciplinary Sciences
Yong Yu, Lin Xie, Stephen J. Pennycook, Michel Bosman, Jiaqing He
Summary: The occurrence of vdW gaps in germanium telluride is mainly driven by strain from the cubic-to-rhombohedral martensitic transition. In this study, direct evidence of strain and structure is provided through in situ nanobeam diffraction and in situ transmission electron microscopy observation. The origin of vdW gaps is discussed using dislocation theory. This work opens up a previously unidentified degree of freedom for adjusting the electronic and thermal properties of materials.
Article
Materials Science, Multidisciplinary
Yunhong Jiang, Qi Lv, Fu Xu, Xing Sun, Yanhuai Ding
Summary: Developing highly active catalysts for hydrogen evolution reaction is crucial for efficient hydrogen production through water splitting. In this study, TiO2/LaFeO3 composite catalysts with multiple heterojunctions were synthesized and showed superior hydrogen evolution performance in both acidic and alkaline solutions under simulated sunlight. The catalysts exhibited high current density and efficiency in hydrogen evolution, making them a promising alternative for reaching remarkable HER performance without relying on fossil fuels.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Physics, Applied
Uma Sharma, U. K. Kailash Veerappan, Pardeep K. Jha, Priyanka A. Jha, Prabhakar Singh
Summary: Being a charge transfer Mott insulator with low metal-insulator temperature, disordered LaFeO3 is a potential material for electrochemical engineering. In this study, we systematically substituted hole (Sr) at La-site and electron (Ti) at Fe-site to improve catalytic behavior. The results show that La0.5Sr0.5FeO3 (LSF) has enhanced conductivity and corrosion resistance, making it a promising electrode material in neutral media.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
R. Lakshmi, Parthasarathi Bera, Maheshwarayya Hiremath, Varun Dubey, Asish K. Kundu, Harish C. Barshilia
Summary: Nanocrystalline perovskite materials LaFeO3, LaFe0.9Mn0.1O3, and LaMnO3 have been synthesized using a novel solution combustion route. Characterization using physicochemical techniques revealed different structures and properties of these materials, with LaFeO3 and LaFe0.9Mn0.1O3 exhibiting weak ferromagnetism and LaMnO3 showing paramagnetic behavior.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Jianxiong Wu, Jean-Philippe Dacquin, Nora Djelal, Catherine Cordier, Christophe Dujardin, Pascal Granger
Summary: Substituting calcium and copper in A-site and B-site of perovskites respectively led to significant improvements in CO and propene oxidation kinetics. The dual substituted samples were more stable, with calcium substitution stabilizing copper inside the perovskite lattice and slowing down subsequent surface agglomeration, leading to optimal performances in certain compositions. A progressive shift from suprafacial to intrafacial mechanism was observed in stoichiometric perovskites involving the redox Fe4+/Fe3+ couple and lattice oxygen species, resulting in a loss in rate.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Analytical
Changlin Xiao, Xiuhai Zhang, Zhuangzhuang Ma, Kai Yang, Xiaotong Gao, Hongqiang Wang, Lichao Jia
Summary: The real-time detection of formaldehyde is crucial for environmental pollution monitoring and healthcare. In this study, indium-doped LaFeO3 porous structure was synthesized to enhance the sensing capability. The results showed that the response value of the material towards 100 ppm formaldehyde at the optimal temperature of 125 degrees C was 122, which was twice the value of the pristine material. Importantly, the sensor demonstrated a distinct response even at a concentration as low as 1 ppb, which is the lowest detection limit reported so far. The improved sensing performance was attributed to the increased surface area, abundant oxygen vacancies, and reduced surface adsorption energy. These findings suggest that indium-doped LaFeO3 is a promising material for practical formaldehyde sensing applications.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Materials Science, Multidisciplinary
Ashutosh Tiwari, Pranat Jain, Oroosa Subohi
Summary: Barium doping and nickel doping induce distortion in the lattice structure of LaFeO3 ceramics, leading to improved dielectric properties. Doping increases the ionic conductivity and grain boundary resistance dominates in all samples.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Xin Sun, Devendra Tiwari, Meicheng Li, David J. Fermin
Summary: Point defects have a significant impact on the properties of semiconductor photoelectrodes. However, their role in photoelectrodes for solar fuels is not well understood. This study investigates the influence of bulk and surface point defects on the photoelectrochemical properties of LaFeO3 thin films.
Article
Chemistry, Physical
Feng Pan, Weidong Zhang, Corinne Ferronato, Jose Luis Valverde, Anne Giroir-Fendler
Summary: Robust and cost-effective LaFe1-xCoxO3 perovskite catalysts were prepared via cobalt substitution, which exhibited improved reducibility, oxygen mobility, and propene oxidation activity. The optimal catalyst LaFe0.8Co0.2O3 showed comparable activity to LaCoO3 at a lower cost, with excellent cyclability, stability, and performance under high space velocity or in the presence of water, making it a promising candidate for industrial application.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Physical
Xiaodan Yan, Jinlu He
Summary: By using time-domain density functional theory and nonadiabatic molecular dynamics, the effect of magnetic ordering on carrier relaxation of LaFeO3 was investigated. The results showed that the strong intraband nonadiabatic coupling led to hot energy and carrier relaxation on a sub-2 ps time scale, with different time scales depending on the magnetic ordering of LaFeO3. Importantly, the energy relaxation was slower than hot carrier relaxation, ensuring effective relaxation of photogenerated hot carriers to the band edge before cooling. Charge recombination then occurred on the nanosecond scale, due to small interband nonadiabatic coupling and short pure-dephasing times. Notably, the A-AFM system exhibited the longest carrier lifetimes, attributed to its weakest nonadiabatic coupling. This study suggests that carrier lifetime can be controlled by manipulating the magnetic ordering of perovskite oxides, providing valuable principles for the design of high-performance photoelectrodes.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Fenghua Xu, Zhipeng Pan, Baicheng Weng
Summary: By incorporating sulfur into nanorods, vacancies of O and S are created, significantly enhancing light absorption and charge separation/transport efficiency, leading to highly efficient photocatalytic degradation of tetracycline hydrochloride.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Xin Sun, Zhineng Lan, Min Wang, Qi Geng, Xiaojun Lv, Meicheng Li
Summary: This study investigates the partial substitution of La3+ ions in LaFeO3 with Ag+ ions to enhance the photoelectrochemical performance. Experimental and computational studies show that Ag-substitution improves surface charge transfer kinetics through introducing active electronic states and increasing electrochemically active surface areas. Furthermore, Ag-substitution decreases grain boundary number and increases majority carrier density, promoting bulk charge transports and reducing bandgap energy. After 8% Ag-substitution, the photocurrent density of LaFeO3 is enhanced by more than 6 times, exhibiting the highest photocurrent gain compared to other substitutions. This work provides insights into the mechanism of enhanced photoelectrochemical performance by doping or substitution.
Article
Chemistry, Physical
Pimsuda Pansa-Ngat, Kamalpreet Singh, Bhrugu Patel, Chaowaphat Seriwattanachai, Pongsakorn Kanjanaboos, Oleksandr Voznyy
Summary: This study introduces a dual-dopant strategy in the fabrication of CsPbI3 films, where modest quantities of two divalent cations (Ca2+ and Mn2+) are simultaneously introduced to improve the phase stability of perovskite nanocrystals. The importance of dopant-based stereoelectronic effects in phase stabilization is uncovered using DFT. The CaMn dual-doped films can retain the black phase for up to 16 days at room temperature and 40-60%RH, while the mono-substituted and non-substituted analogues revert to the yellow phase immediately under the same conditions, demonstrating the ability of dual doping to improve optoelectronic materials' durability where a single dopant fails.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Anup Kuchipudi, Ragunath Madhu, Pugalendhi Arunmuthukumar, Swaminathan Sundarravalli, Gosipathala Sreedhar, Subrata Kundu
Summary: Au-decorated LaFeO3 catalyst shows significantly improved catalytic activity for electrocatalytic water splitting, providing a pathway for sustainable hydrogen production.
INORGANIC CHEMISTRY
(2023)
