Article
Chemistry, Physical
Xin F. Tan, Manjin Kim, Qinfen Gu, Julio Pinzon Piraquive, Guang Zeng, Stuart D. McDonald, Kazuhiro Nogita
Summary: This study investigates the effects of Na in hypo-eutectic Mg-lwt.%Si alloys for H-2 storage applications. The addition of trace amounts of Na is vital in improving the H-2 sorption kinetics, achieving a high storage capacity. The study also analyzes the hydrogen sorption mechanisms and identifies the role of Na in facilitating hydrogen diffusion.
JOURNAL OF POWER SOURCES
(2022)
Article
Biochemistry & Molecular Biology
Toyoto Sato, Hiroyuki Saitoh, Reina Utsumi, Junya Ito, Yuki Nakahira, Kazuki Obana, Shigeyuki Takagi, Shin-ichi Orimo
Summary: In this study, the hydrogen absorption reaction of LaNi5 under high pressures above 1 GPa was investigated, and it was found that LaNi5 absorbed 2.07% hydrogen at 6 GPa, indicating a higher hydrogen storage capacity compared to reactions below 1.0 MPa. Additionally, the hydrogen-absorbed LaNi5Hx decomposed into NiH under high-pressure conditions, and a new hydride phase with different crystal parameters was observed.
Article
Materials Science, Multidisciplinary
Tay Sparks, Duc Nguyen-Manh, Pengfei Zheng, Damian Sobieraj, Michael Gorley, Thomas Connolley, Christina Reinhard, Yiqiang Wang, Biao Cai, Jan S. Wrobel
Summary: This study investigated the mechanical properties of the vanadium base alloy V-4Cr-4Ti using in-situ high energy X-ray diffraction, and calculated its polycrystalline elastic properties and Zener anisotropy. The results are valuable for further assessing the suitability of V-4Cr-4Ti as a structural material.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Hu Yao, Guang Zeng, Qinfen Gu, Kazuhiro Nogita, Jing Guo, Qian Li
Summary: The influences of microstructure evolution induced by thermal-mechanical processing on the hydrogen storage performance of Mg-Ni-Gd-Y-Zn-Cu alloys were investigated. The extruded alloy showed higher hydrogen absorption capacity and faster hydrogen ab/desorption kinetics due to refined alpha-Mg grains and the presence of 14H-type LPSO phases. These findings have implications for the design and manufacturing of magnesium-based hydrogen storage materials.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Physical
Nayely Pineda-Romero, Claudia Zlotea
Summary: The effect of Al addition on the structure, microstructure, and hydrogen storage properties of the ternary TiVNb alloy was investigated. It was found that the addition of Al can decrease the hydrogen storage capacity but also destabilize the formation of dihydride. Among the different compositions, the alloy with x = 0.05 Al content exhibited high initial storage capacity, less stable hydride formation, better desorption properties, and enhanced reversible capacity during cycling compared to the ternary TiVNb alloy.
Article
Chemistry, Physical
D. Pukazhselvan, Ihsan Caha, Suresh Kumar Jakka, Vanessa C. D. Graca, Laura I. V. Holz, M. J. Soares, Andrei V. Kovalevsky, Francis Leonard Deepak, Duncan Paul Fagg
Summary: This study provides insights into the active catalytic species in ceria additive loaded hydrogen storage system, MgH2, through mechanical milling and cycling tests. In-situ X-ray diffraction and Raman spectroscopy studies confirm the interaction between MgH2 and CeO2, with evidence of reduced cerium oxides throughout the interactions. The CeHx/CeOx interfaces play a key role in suppressing the formation of MgO rock salt.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Magda Peska, Katarzyna Smektalska, Julita Dworecka-Wojcik, Sylwia Terlicka, Wladyslaw Gasior, Wojciech Gierlotka, Adam Debski, Marek Polanski
Summary: This study presents a systematic investigation of the interactions between hydrogen and Mg-Ag alloys prepared by mechanical alloying. The alloys were found to be effectively synthesized with mechanical alloying, extending solubility limits compared to known phase diagrams. Further annealing enhanced synthesis to obtain well crystallized samples that could absorb significant amounts of hydrogen. Magnesium hydride and AgMg intermetallics were formed as residual products that did not react with hydrogen under the chosen conditions. Samples characterized directly after ball milling showed higher reaction kinetics with hydrogen.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
D. Pukazhselvan, K. S. Sandhya, Narendar Nasani, Duncan Paul Fagg
Summary: This study shows that the dehydrogenation activation energy of MgH2 can be lowered by incorporating ceria, but the ceria undergoes phase transformations during dehydrogenation. It also suggests that reduced cerium oxide phases may be mistaken as cerium hydrides, therefore the belief in CeH2 as an active catalyst in the MgH2/CeO2 hydrogen storage system needs further scrutiny.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
S. P. Kandare, B. Joseph, Mala N. Rao, S. S. Dahiwale, S. D. Dhole, Rekha Rao
Summary: Raman spectroscopic and synchrotron powder diffraction measurements were used to study the pressure-induced phase transitions in nano-crystalline Cu2ZnSnS4, revealing a different sequence of transitions compared to bulk Cu2ZnSnS4. The volume data for the ordered kesterite phase was obtained, and the mechanical instability of the disordered kesterite phase leading to a second structural transition was identified.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Review
Metallurgy & Metallurgical Engineering
Youhong Peng, Kesong Miao, Wei Sun, Chenglu Liu, Hao Wu, Lin Geng, Guohua Fan
Summary: Characterizing the microstructure and deformation mechanism of metallic materials is crucial for understanding the microstructure-property relationship. Advanced synchrotron radiation facilities have enabled non-destructive visualization of full-field structural information in three dimensions, contributing to significant progress in recent decades. Future innovations in next-generation synchrotron radiation and emerging technologies hold great potential for further advancements in material characterization.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Tessui Nakagawa, Daichi Heshiki, Hiroki Higa, Junko Kawakami, Riki Kobayashi, Nobuko Hanada, Kazutaka Ikeda, Toshiya Otomo, Hironori Ofuchi, Masayoshi Ishida
Summary: This study used multiple analytical methods to reveal the relationship between CO2 tolerance of AB(2)-type hydrogen storage alloys and dopant M, with a focus on the importance of B site elements.
MATERIALS TRANSACTIONS
(2021)
Article
Chemistry, Physical
Zhilun Lu, Weichao Bao, Ge Wang, Shi-Kuan Sun, Linhao Li, Jinglei Li, Huijing Yang, Hongfen Ji, Antonio Feteira, Dejun Li, Fangfang Xu, Annette K. Kleppe, Dawei Wang, Shi-Yu Liu, Ian M. Reaney
Summary: The study on lead-free Ag1-3xNdxTayNb1-yO3 antiferroelectric ceramics reveals the changes in structure and performance characteristics with doping of Nd and Ta. The doped elements contribute to stabilizing the antiferroelectric structure, increasing the switching field, optimizing polarization, and enhancing energy storage density.
Article
Materials Science, Multidisciplinary
Philipp Hans, Cristian Mocuta, Marie-Ingrid Richard, Daniel Benoit, Philippe Boivin, Yannick Le-Friec, Roberto Simola, Olivier Thomas
Summary: This study investigates the effects of hydrogen treatment on the crystallization behavior of N-doped, Ge-rich Ge2Sb2Te5 phase-change materials for memory applications. The results show that hydrogen treatment lowers the crystallization temperature of Ge2Sb2Te5 cubic phase and promotes the formation of the trigonal phase in thin films.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2022)
Article
Chemistry, Physical
Adam Debski, Sylwia Terlicka, Magda Peska, Agnieszka Bigos, Wladyslaw Gasior, Wojciech Gierlotka, Marek Polanski
Summary: In this paper, the interactions between mechanically alloyed Mg6Pd1-xAgx alloys and hydrogen were studied. The structures of the alloys were analyzed using X-ray diffraction (XRD), which confirmed the presence of a single Mg6Pd-type phase for samples with up to x=0.5 silver concentration. The kinetics of hydrogenation process and the properties of synthesized hydride were investigated using a Sievert-type sorption analyzer and differential scanning calorimetry (DSC) with thermogravimetric analysis (TGA). The results showed that partial substitution of palladium with silver improved the hydrogen sorption kinetics compared to pure Mg6Pd intermetallic phase, but resulted in lower hydrogen content. The influence of silver on the decomposition kinetics was also observed.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
K. Itoh, J. Saida, E. R. Barney, A. C. Hannon
Summary: The occupation of interatomic hole sites by deuterium in a deuterated Ni67Zr33 amorphous alloy was investigated using diffraction measurements and simulation techniques. The results show that deuterium atoms occupy various types of polyhedral hole sites, as well as tetrahedral ones. The occupation of different hole sites has different effects on the volume of the material.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Multidisciplinary
Siku Choi, Songi Song, Yeongnam Ko, Ki Chul Kim
Summary: This study investigates the effects of the redox-active site type and the bridging style on the structural integrity and intrinsic redox activity of organic complexes. The findings provide insights for the design of insoluble organic cathode materials that can sustain high performance and structural durability.
Article
Materials Science, Multidisciplinary
Hyungu Han, Chae Young Go, Ki Chul Kim
Summary: This study systematically explores the structural, electronic, and electrochemical properties of a series of transition metal-doped, Li-excessive, layered Li2NiO2 materials. The incorporation of Cr dopant with electronically suitable d orbitals is revealed to be the best choice to design high-voltage Li2NiO2 cathode materials with little sacrifice of energy density and structural stability. Further investigation highlights that the d-orbital based design of a proper dopant would be a key strategy to develop Li2NiO2-based cathode materials with high-performance battery applications.
CURRENT APPLIED PHYSICS
(2023)
Article
Engineering, Chemical
Jeong Pil Kim, Chae Young Go, Junhyeok Kang, Yunkyu Choi, Ju Yeon Kim, Jiwon Kim, Ohchan Kwon, Ki Chul Kim, Dae Woo Kim
Summary: Nanoporous multilayer graphene oxide membranes were fabricated to achieve Li-ion selectivity. The influence of interlayer spacing and nanopore presence on ion separation performance was investigated. The NMG membrane showed different ion permeance depending on ion concentration, with faster permeation rate of divalent ions and Li-ion selectivity at high ionic strength.
JOURNAL OF MEMBRANE SCIENCE
(2023)
Article
Materials Science, Ceramics
Do -Young Go, Dae-Han Lee, Dong-Geun Lee, Jae Seung Seol, Ki Chul Kim, Sungki Lim
Summary: Cesium-doped BASEs were prepared to improve the wettability of molten sodium in Na/NiCl2 batteries. The properties, such as ionic conductivity, were studied. The addition of cesium affected the crystal phase formation, relative sintered density, and ionic conductivities.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Alexander P. Hawkins, Andrea Zachariou, Stewart F. Parker, Paul Collier, Nathan S. Barrow, Russell F. Howe, David Lennon
Summary: The cracking reactions of 1-octene over H-ZSM-5 zeolite were investigated, and it was found that it follows a dual-cycle hydrocarbon pool mechanism similar to methanol-to-hydrocarbons chemistry. Higher temperatures are required for full efficiency, while lower temperatures lead to deactivation and coke deposition. Inelastic neutron scattering was used to study coke composition, revealing two distinct deactivation mechanisms depending on reaction temperature. Steam treatment of the zeolite delayed catalyst activation and resulted in increased light olefin production, with slower deactivation compared to fresh zeolite.
APPLIED CATALYSIS A-GENERAL
(2023)
Article
Engineering, Environmental
P. Anil Kumar Reddy, Hyungu Han, Ki Chul Kim, Sungjun Bae
Summary: We synthesized a nanocomposite of 2D reduced graphene oxide (rGO) and 3D graphitic carbon (gC) embedded CoS2@gC/rGO as an anode material for supercapacitors. The composition of the composite was controlled by changing the calcination temperatures of the rGO sandwiched ZIF-67. The CoS2@gC/rGO composite exhibited high specific capacitance and cyclic stability, and was used to fabricate an all-solid-state asymmetric supercapacitor device with excellent performance.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Stewart F. Parker, A. Dominic Fortes, Daniel W. Nye, Sarah J. Day, Dietmar Kuck
Summary: The structure and vibrational spectroscopy of centrohexaindane were studied. The molecule has tetrahedral symmetry in solution, but a triclinic or monoclinic structure in the solid state. The vibrational spectroscopy indicates the presence of at least two molecules in the primitive cell, possibly with centrosymmetric space group.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Engineering, Chemical
Songi Song, Ki Chul Kim
Summary: This study investigates the structural stability and thermodynamic degradation probabilities of selected fluorocarbon compounds as alternative insulating gases. It reveals that these compounds are suitable insulation candidates under vacuum conditions, but the presence of specific impurity gases may compromise their stability.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2023)
Article
Chemistry, Physical
Jae Seung Seol, Seungho Yu, Ki Chul Kim
Summary: Despite the broad range of inorganic cathode materials developed to date, there is a lack of studies on the correlation between the electronic structure and performance. This study suggests that the symmetricity/asymmetricity of e(g)/t(2g) orbitals in redox-active elements is crucial in determining the Jahn-Teller distortion of LiM0.125Mn1.875O4 spinel-type cathode materials. The presence of Mn3+ ions during the discharging process leads to poor structural durability and electrochemical performance, and this limitation can be overcome by adding carefully selected Ni2+ dopants.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Review
Chemistry, Physical
Andrea Zachariou, Alexander P. Hawkins, Paul Collier, Russell F. Howe, Stewart F. Parker, David Lennon
Summary: The methanol-to-hydrocarbons reaction is an important industrial process that uses zeolite catalysts to produce light olefins and methylated benzenes. While it has been extensively studied using various physical and spectroscopic methods, neutron scattering has been underutilized. Neutron methods can provide unique insights into the catalyst and the different stages of the process. In this mini-review, we discuss the application of neutron scattering in studying the methanol-to-hydrocarbons reaction and its potential contributions to further research.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Stewart F. F. Parker, Jessica E. E. Trevelyan, Hamish Cavaye
Summary: We have measured the spectra of oligothiophenes and polythiophene, both pristine and after doping with iodine. The spectra converged towards that of polythiophene, showing only small changes in the INS spectra compared to dramatic changes in the infrared and Raman spectra on doping. The electronic structure modification accounted for the major changes observed.
Article
Chemistry, Analytical
Giulia Festa, Adriana P. Mamede, David Goncalves, Eugenia Cunha, Winfried Kockelmann, Stewart F. Parker, Luis A. E. Batista de Carvalho, Maria Paula M. Marques
Summary: The first neutron diffraction study on the in-situ anaerobic burning of human bones was conducted to interpret heat-induced changes in bone, previously detected using vibrational spectroscopy. Structural and crystallinity variations were observed in human femur, tibia, and reference hydroxyapatite samples when heated under anaerobic conditions. The study provides insight into the structural reorganization of the bone matrix at different temperatures and can contribute to the understanding of heat-prompted changes in bone, which can serve as biomarkers for burning temperature. This information is important for forensic science, archaeology, and other biomaterial studies.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Annelouise M. Mccullagh, Emma K. Gibson, Stewart F. Parker, Keith Refson, David Lennon
Summary: The adsorption geometry of nitrobenzene on a 5 wt% Pd/Al2O3 catalyst is investigated using infrared spectroscopy and density functional theory calculations.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Hamish Cavaye, Christos E. Ballas, Winfried Kockelmann, David Lennon, Paul Collier, Andrew P. E. York, Peter W. Albers, Stewart F. Parker
Summary: In this study, in situ neutron imaging was used to observe the adsorption/absorption of hydrogen within a packed catalyst bed of a Pd/C catalyst. The spatial resolution was approximately 430 μm and the temporal resolution was approximately 9 s. Additionally, the H-2/D-2 exchange process across the catalyst bed was monitored in real time.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Annelouise M. Mccullagh, Emma K. Gibson, Stewart F. Parker, Keith Refson, David Lennon
Summary: The adsorption geometry of nitrobenzene on a 5 wt% Pd/Al2O3 catalyst is investigated using infrared spectroscopy and DFT calculations. It is found that the adsorption complex occurs vertically or tilted with respect to the metal surface, with a single Pd-O bond. However, there is a contradiction between the calculated and observed structures, which can be attributed to the difference between isolated molecule adsorption and multi molecule adsorption. Furthermore, the adsorption geometry of nitrobenzene is closely related to the high aniline selectivity observed for Pd/Al2O3 catalysts.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
J. Zamora, T. Bautista, N. S. Portillo-Velez, A. Reyes-Montero, H. Pfeiffer, F. Sanchez-Ochoa, H. A. Lara-Garcia
Summary: Experimental and DFT studies were conducted on the structural, magnetic, and optical properties of RFeO3 perovskites. The perovskites exhibited an orthorhombic crystal structure and weak ferromagnetic behavior. They were confirmed to be semiconductors with a bandgap of approximately 2.1 eV.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xianxiang Lv, Jing Jin, Weiguang Yang
Summary: By depositing TiN and TiO2 surface layers on AlSi films, the electrochemical performance of silicon-based anodes can be significantly improved, suppressing volume expansion and promoting the formation of a stable SEI layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Sharafat Ali, Haider Ali, Syedul Hasnain Bakhtiar, Sajjad Ali, Muhammad Zahid, Ahmed Ismail, Pir Muhammad Ismail, Amir Zada, Imran Khan, Huahai Shen, Rizwan Ullah, Habib Khan, Mohamed Bououdina, Xiaoqiang Wu, Fazal Raziq, Liang Qiao
Summary: The construction and optimization of redox-heterojunctions using a bifunctional phosphate as an electron-bridge demonstrated significant improvements in photo catalytic activity, including enhanced dispersion, reduced interfacial migration resistance, and increased abundance of active-sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ren-Ni Luan, Na Xu, Chao-Ran Li, Zhi-Jie Zhang, Yu-Sheng Zhang, Jun Nan, Shu-Tao Wang, Yong-Ming Chai, Bin Dong
Summary: Extensive research has revealed that oxygen evolution reaction (OER) in alkaline conditions involves dynamic surface restructuring. The development and design of sulfide/oxide pre-catalysts can reasonably adjust the composition and structure after surface reconstruction, which is crucial for OER. This study utilized a simple two-step hydrothermal method to achieve in situ S leaching and doping, inducing the composition change and structure reconstruction of CoFe oxides. The transformed FeOOH and CoOOH exhibited excellent OER activity and could be easily mass-produced using low-cost iron based materials and simple methods.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jun'an Lai, Daofu Wu, Peng He, Kang An, Yijia Wang, Peng Feng, WeiWei Chen, Zixian Wang, Linfeng Guo, Xiaosheng Tang
Summary: Zero-dimensional organic-inorganic metal halides (OMHs) are gaining attention in the fabrication of light-emitting diodes due to their broad emission band and high photoluminescence quantum yield. This work synthesized a zero-dimensional organic tetraphenylphosphonium bismuth chloride (TBC) that showed efficient blue light emission, with the emission mechanism attributed to the transition of Bi3+ ions. White light-emitting diodes (WLEDs) were fabricated using TBC, along with green-emitting and red-emitting single crystals, achieving single-component white emissions. These findings demonstrate the different emission mechanism of ns2 ions-based OMHs and highlight the potential of bismuth-based OMHs in WLEDs applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xuewei Liang, Yunhai Su, Taisen Yang, Zhiyong Dai, Yingdi Wang, Xingping Yong
Summary: The revolutionary design concept of high-entropy alloys has brought new opportunities and challenges to the development of advanced metal materials. In this work, AlCrCuFe2NiTix high-entropy flux cored wires were prepared by combining the design idea of a high-entropy alloy with the characteristics of flux cored wire. AlCr-CuFe2NiTix high-entropy surfacing alloys were prepared using gas metal arc welding technology. The wear properties of the alloys were analyzed, and the phase composition, microstructure, strengthening mechanism, and wear mechanism were discussed. The results show that the alloys exhibit a dendritic microstructure with BCC/B2 + FCC phases. Increasing Ti content leads to the precipitation of Laves phase. The alloys show improved microhardness and wear resistance due to the precipitation of coherent B2 and Laves phases. However, excessive Ti addition results in the increase of Laves phase and reduced wear resistance of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
M. Vadivel, M. Senthil Pandian, P. Ramasamy, Qiang Jing, Bo Liu
Summary: This work presents the enhanced photocatalytic and electrochemical performance of g-C3N4 assisted PAA on CoFe2O4 ternary nanocomposites. The incorporation of PAA and g-C3N4 improves the separation efficiency of photogenerated charge carriers, resulting in superior photocatalytic degradation and high specific capacitance values.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Vibhu T. Sivanandan, Ramany Revathy, Arun S. Prasad
Summary: In this study, pure and doped cobalt ferrite nanoparticles were prepared using the sol-gel auto-combustion method with the aid of lemon juice as eco-fuel. The crystal structure, lattice parameter, crystallite size, microstrain, optical parameters, and room temperature magnetic properties of the samples were analyzed. The effect of doping on the magnetic properties was also investigated.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qing Guo, Bowen Zhang, Benzhe Sun, Yang Qi
Summary: This study prepared ZnO films with various nonpolar preferred orientations using conventional chemical bath deposition method and characterized their growth process and mechanism. It was found that the type and concentration of nitrate could control the preferred orientation and surface roughness of ZnO films. Additionally, ZnO films with different preferred orientations exhibited different optical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Chong Zhang, Yan Liu, Zhaoyan Wang, Hang Yang
Summary: In this study, six bimetallic FeCo particles were synthesized via the hydrothermal method at different Fe:Co ratios. The Fe:Co ratio not only modulates the composition of the particles but also influences their structure and magnetic properties. The FeCo alloys showed a transformation from an Fe-based structure to a Co-based structure with increasing Co content. The Fe:Co ratio of 1:1 and 3:1 resulted in particles with the highest and lowest saturation magnetization, respectively.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Jianning Zhang, Jing Li, Yiren Wang, Xiaodong Mao, Yong Jiang
Summary: We conducted a study on the formation of ultra-fine Y-Ti-Ta-O nano-oxides in Ta+B micro-alloyed 13CrWTi-ODS alloys using electron microscopy and first-principles calculations. The Y-Ti-Ta-O nano-oxides were found to be mainly Y2(Ti,Ta)2O7, with an average size of 7 nm and a number density of 6.8 x 1023 m-3. Excess boron was found to enhance the adhesion of some low-sigma grain boundaries but weaken the Fe/Y2Ti2O7 interface, while excess tantalum enhanced the Fe/Y2Ti2O7 interface but caused serious degradation of grain boundaries.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Yirong Fang, Pei Cheng, Hang Yuan, Hao Zhao, Lishu Zhang
Summary: A new composite system of nitrogen-doped reduced graphene oxide and black phosphorus quantum dots has been developed for tumor therapy, showing improved electrochemical properties and stability. The system generates hydrogen peroxide and hydroxyl radical to effectively kill tumor cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Xiufang Qin, Yuanli Ma, Hui Zhang, Ting Zhang, Fang Wang, Xiaohong Xu
Summary: The structure and magnetism of cobalt ferrites after Mn2+-Tb3+ co-doping were studied. Co-doped samples exhibited cubic spinel structure and spherical shape of ferrite nanoparticles. The redistribution of Co2+ and Fe3+ ions between octahedral and tetrahedral sites was observed due to Mn2+-Tb3+ co-doping. The coercivity and magnetization saturation of co-doped samples were significantly improved, leading to a maximum energy product that is 190% higher than that of the un-doped sample.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Ho Yeon Lee, Wonjong Yu, Yoon Ho Lee
Summary: Recently, there has been an increasing interest in developing ultra-fine nanostructured electrodes with extensive reaction areas to enhance the performance and low-temperature operation of solid oxide fuel cells. The use of a refined approach involving co-sputtering metal alloys and oxide targets has demonstrated the feasibility of nano-columnar structures in perovskite-based electrodes, expanding the temperature range of thin film electrodes. This study systematically examines the effects of chamber pressure control in the co-sputtering process and identifies the intricate relationship between sputtering pressure and film structure. By fine-tuning the columnar growth in the electrode, significant improvements in performance and thermo-mechanical properties were achieved, resulting in high-performance all-sputtered solid oxide fuel cells.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
Article
Chemistry, Physical
Qianyun Bai, Xiaoxiao Yan, Da Liu, Kang Xiang, Xin Tu, Yanhui Guo, Renbing Wu
Summary: This study proposes a simple method to develop a non-precious transition metal-based electrocatalyst with high catalytic activity and robustness for the hydrogen evolution reaction. The as-synthesized electrode exhibits a low overpotential and high current density, indicating its potential in energy conversion.
JOURNAL OF ALLOYS AND COMPOUNDS
(2024)
