Article
Chemistry, Multidisciplinary
Zaifa Wang, Baiyu Guo, Jitong Yan, Ziqi Zhang, Yong Su, Yongfu Tang, Liqiang Zhang, Lingyun Zhu, Jianyu Huang
Summary: The electrochemistry of the Li-SeS2 battery was revealed in this study, showing phase-separated Se and S as charge products. Among the various SexSy cathodes, SeS2 exhibited the best electrochemical performance. The Li-SeS2 all-solid-state battery demonstrated high reversible capacity and areal capacity, bringing us closer to practical applications.
Article
Chemistry, Physical
M. A. Mazo, A. C. Caballero, J. Rubio
Summary: In this study, cheap, abundant, and easily-obtained carbon fillers such as graphite and carbon black were successfully incorporated into a silicon oxycarbide matrix to obtain dense crack-free bulk composites with enhanced electrical and thermal conductivities. Raman parameters were crucial for understanding the electronic and/or phonon transport in the composites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Inorganic & Nuclear
Nighat Zarshad, Jianghua Wu, Anis Ur Rahman, Asad Ali, Ce Qiu, Ruziguli Aisha, Rui Gao, Yu Xie, Henmei Ni
Summary: By integrating varying amounts of aluminum into ultrathin nanosheets of NiCo layer double hydroxide, a novel binder and conductive agent-free electrode material was designed to improve the electric efficacy of supercapacitors. The NiCo2Al0.5-OH electrode exhibited a specific capacitance of 1570 F g-1 and an aqueous asymmetric supercapacitor demonstrated excellent energy density and capacitance retention over cycles.
SOLID STATE SCIENCES
(2021)
Review
Chemistry, Multidisciplinary
Jianing Lu, Zhi Zhang, Yifan Zheng, Yihua Gao
Summary: This review comprehensively summarizes the recent progress in in situ TEM investigations of sodium-ion batteries (SIBs), focusing on the morphological, structural, and chemical evolutions of cathode materials, anode materials, and solid-electrolyte interface during sodium storage. The detailed relationship between the structure/composition of electrode materials and the electrochemical performance of SIBs has been clarified. This review aims to provide insights for the effective selection and rational design of advanced electrode materials for high-performance SIBs.
ADVANCED MATERIALS
(2023)
Review
Chemistry, Multidisciplinary
Jianing Lu, Zhi Zhang, Yifan Zheng, Yihua Gao
Summary: This review comprehensively summarizes recent progress in in situ transmission electron microscopy (TEM) investigations on the morphological, structural, and chemical evolutions of cathode materials, anode materials, and solid-electrolyte interface during the sodium storage of sodium-ion batteries (SIBs). The detailed relationship between the structure/composition of electrode materials and the electrochemical performance of SIBs has been clarified.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Munmun Basak, Md Lutfor Rahman, Md Farid Ahmed, Bristy Biswas, Nahid Sharmin
Summary: Cobalt ferrite nanoparticles were synthesized using co-precipitation technique with different precipitating agents, affecting the structure and size distribution. Various analysis methods showed highly correlated results, with SSP method being the most compatible.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Xiaobo Chen, Jianyu Wang, Yaguang Zhu, Zhenhua Xie, Shuonan Ye, Kim Kisslinger, Sooyeon Hwang, Dmitri N. Zakharov, Guangwen Zhou
Summary: Noncatalytic gas-solid reactions are commonly assumed to be irreversible, but this study shows the existence of reverse elements in the Ni oxidation reaction, resulting in NiO reduction. The oxidation process involves preferential CO2 adsorption along step edges, while the reduction process involves preferential CO adsorption on step edges. Temperature and CO2 pressure effect maps are constructed to illustrate the dynamics of the competing NiO redox reactions. This study demonstrates the ability to manipulate gas-solid reactions by controlling the gas environment or atomic structure of the solid surface.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Jochen A. Kammerer, Xiaoyang Duan, Frank Neubrech, Rasmus R. Schroder, Na Liu, Martin Pfannmoeller
Summary: The formation of metastable gamma-MgH2 and nanoparticle design can improve dehydrogenation performance of the Mg/MgH2 system by utilizing volume expansion and stress release mechanisms during hydrogenation.
ADVANCED MATERIALS
(2021)
Article
Energy & Fuels
Inga Buerger, Marc Linder
Summary: Thermochemical energy storage systems are traditionally passive, but can also be viewed from a gas storage perspective; incorporating gas flow control strategies can lead to new possibilities in design and control of such systems.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Materials Science, Multidisciplinary
Claudia Felser, Stuart Parkin
Summary: Topology is a topic of considerable interest in materials science, particularly in magnetic materials where it leads to new topological objects such as skyrmions and Weyl fermions. Heusler compounds, a highly tunable family of compounds, exhibit diverse topological electronic and magnetic textures. Skyrmions in Heusler compounds have the potential to be used as magnetic bits in high-density storage devices and for neuromorphic computing systems beyond Moore's Law.
Article
Nanoscience & Nanotechnology
Neng-Hao Gan, Yi-Hsuan Sun, Tzu-Ching Tsao, Chia-Lin Li, Jia-Heng Liu, Hung-Wei Yen, Chun-Hway Hsueh, Jer-Ren Yang, Shing-Hoa Wang, Jien-Wei Yeh, Horng-Yi Chang, Wen-Hsing Hou
Summary: The presence of Cu-rich nanoparticles in the delta phase of Cu-containing alloys at high temperature was unexpectedly observed. Thermodynamic calculations showed that the solubilities of Cu in the gamma and delta phases at 1295 degrees C were 3.52 and 1.99 wt%, respectively. Quenching from 1295 to 25 degrees C resulted in the ultra-supersaturation of Cu in the delta phase, leading to the precipitation of Cu-rich nanoparticles.
SCRIPTA MATERIALIA
(2022)
Article
Multidisciplinary Sciences
M. B. Sreedhara, Simon Hettler, Ifat Kaplan-Ashiri, Katya Rechav, Yishay Feldman, Andrey Enyashin, Lothar Houben, R. Arenal, Reshef Tenne
Summary: The text discusses the significance and potential applications of asymmetric two-dimensional structures, the synthesis of asymmetric misfit layer superstructures, and the chemical selectivity and stability of these structures, providing insights for further research.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Chemistry, Multidisciplinary
Jing Hou, Zihan Song, Mateusz Odziomek, Nadezda V. V. Tarakina
Summary: In this study, nitrogen-doped porous hollow carbon spheres were used to analyze the behavior of sodium storage in a commercial liquid electrolyte. It was found that during the sodiation process, a solvated ionic layer forms on the surface of the carbon spheres, followed by irreversible expansion due to solid-electrolyte interphase (SEI) formation. The N-PHCSs layer acts as a protective layer, preventing the growth of dendrites at the anode.
Article
Chemistry, Multidisciplinary
Shouheng Li, Jinguo Lin, Yun Chen, Zheng Luo, Haifeng Cheng, Feng Liu, Jin Zhang, Shanshan Wang
Summary: Understanding the growth behavior and morphology evolution of defects in 2D transition metal dichalcogenides is significant for nanoelectronic device performance tuning. This study combines low-voltage aberration-corrected transmission electron microscopy with in situ heating and fast frame rate camera to investigate sulfur vacancy lines in monolayer MoS2. The growth anisotropy of line defects is found to be dependent on vacancy concentration, with lengthening and broadening as vacancy densifies. The defect morphology evolves from a dense triangular network to an ultralong linear structure with increasing temperature, due to temperature-sensitive vacancy migration. Atomistic dynamics of line defect reconstruction on the millisecond time scale are captured. Density functional theory calculations, Monte Carlo simulation, and configurational force analysis are implemented to understand growth and reconstruction mechanisms. The work combines high-resolution imaging with quantitative analysis to obtain atomic-level structure and large-area statistical rules simultaneously. It provides new ideas for balancing accuracy and universality in TEM study and is helpful for controlled sculpture of nanomaterials.
Article
Chemistry, Multidisciplinary
Hao-Chin Huang, Kai-Yuan Hsiao, Yu-Han Tseng, Yan-De Chen, Ming-Yen Lu
Summary: In this study, an in situ transmission electron microscopy (TEM) heating system was used to investigate the morphological changes of cubic Ag nanoparticles (NPs) and Ag-based core-shell structures induced by sublimation, as well as the influence of shell coverage on thermal stability. It was found that large Ag NPs (>50 nm) showed a three-stage sublimation-induced morphological change, while small Ag NPs (<30 nm) showed a uniform sublimation. The sublimation process of core-shell NPs started at stage II, and the thermal stability was enhanced by carbon shell passivation.
Article
Engineering, Environmental
Hyojun Lim, Hyeongwoo Kim, Sang-Ok Kim, Wonchang Choi
CHEMICAL ENGINEERING JOURNAL
(2020)
Article
Energy & Fuels
Yongheum Lee, Sang-Ok Kim, Hyung-Seok Kim, Seungho Yu
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2020)
Article
Chemistry, Multidisciplinary
Yongheum Lee, Jiwon Jeong, Hee-Dae Lim, Sang-Ok Kim, Hun-Gi Jung, Kyung Yoon Chung, Seungho Yu
Summary: The study investigated the high ionic conductivities of Li6+xSb1-xSixS5I using first-principles calculations and experiments, demonstrating favorable characteristics like high ionic conductivity, low activation energy, and good stability. The high Si content in the superionic conductor Li6.75Sb0.25Si0.75S5I shows substantial promise for practical use in all-solid-state Li batteries.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Hyojun Lim, Seungho Yu, Wonchang Choi, Sang-Ok Kim
Summary: This study successfully synthesized a high-performance N-MoS2/C@SiOC composite material with a hierarchically designed core-shell heterostructure, exhibiting excellent reversible capacity, high capacity retention, and outstanding rate capability. The strategy developed in this study allows for the fabrication of high-performance metal sulfide anodes and other high-capacity anode materials for energy storage applications.
Article
Energy & Fuels
Ariono Verdianto, Hyojun Lim, Jin Gu Kang, Sang-Ok Kim
Summary: This research presents the synthesis of SnSb nanoalloy-decorated NiO microspheres, delivering high capacity and improved electrode kinetics for anode materials in sodium-ion batteries. The unique microsphere architecture exhibits advanced performance, achieving high reversible capacity and long-term cycling performance through nanosizing and nanoconfinement effects.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Junhwan Je, Hyojun Lim, Hyun Wook Jung, Sang-Ok Kim
Summary: The structural stability and electrochemical performance of conversion-based metal sulfides in sodium-ion batteries are improved by synthesizing CuS/FeS2@NC nanocube anodes, which demonstrate high desodiation capacity, remarkable long-term cycle life, and good rate capability.
Article
Materials Science, Ceramics
Dong Hyun Kim, Ji-Young Kim, Jae-Ho Park, Sang-Ok Kim, Hyung-Seok Kim, Kwang-Bum Kim, Kyung Yoon Chung
Summary: Room-temperature sodium storage technology has been studied as an alternative to lithium-ion batteries. In situ X-ray diffraction techniques were used to investigate the synthesis process and thermal stability of the NaNiO2 cathode material for Na-ion batteries. The findings provide important guidance for the development of Ni-based NaMO2 oxides for next-generation Na-ion batteries.
CERAMICS INTERNATIONAL
(2022)
Article
Energy & Fuels
Seunghak Lee, Jeongeun Park, Eunjeong Seok, Minjun Kim, Minkyeong Ku, Hyojun Lim, Sang-Ok Kim, Heechul Jung, Wonchang Choi
Summary: High-Ni layered-oxide cathode materials have high specific capacity but exhibit poor cyclability and low thermal stability due to side reactions with electrolytes. To address this, we developed a strategy to form a LiNbO3 coating on the Ni-rich layered-oxide surface using polydopamine. The LiNbO3-coated cathode showed improved thermal stability and cycling performance, suggesting the feasibility of developing cathode materials for high-oxidation states and high-temperature environments.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Energy & Fuels
Dong Hyun Kim, Kyung-Hoon Jang, Kwangyup Jang, Kyung-Seop Shin, Hyung-Seok Kim, Sang-Ok Kim, Kwang-Bum Kim, Kyung Yoon Chung
Summary: Recent research has focused on the optimal design of a large Mg anode for large-scale Mg-air primary batteries. Through the use of multiple current-collector contact points, the study found that the discharge capacity and energy conversion efficiency of the battery can be significantly improved.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Nanoscience & Nanotechnology
Da-Sol Kwon, Sang Hyuk Gong, Seunghan Yun, Daun Jeong, Junhwan Je, Hee Joong Kim, Sang-Ok Kim, Hyung-Seok Kim, Jimin Shim
Summary: This study proposes sodiophilic gel polymer electrolytes with a porosity-gradient Janus structure to suppress Na dendrite growth. By regulating Na+ distribution and controlling the morphology of polymer electrolytes, dendrite growth can be significantly impacted.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Ariono Verdianto, Hyojun Lim, Jungjoon Park, Sang-Ok Kim
Summary: In this study, sandwich-like heterostructured composites composed of multilayered MXene and SnSb nanocrystals were prepared via a simple wet-chemical precipitation method. The multilayered MXene with mechanical robustness and high electrical conductivity helped to accommodate the severe volume changes of SnSb nanocrystals, and provide a sufficient conductive network that facilitated electron and Na-ion transportation, and participate in electrochemical reactions through its capacitive behavior. The uniformly embedded SnSb nanocrystals in the interlayer of MXene prevented the re-stacking of the MXene multilayer upon cycling. The SnSb/MXene composite anode exhibited remarkable reversible capacity with dramatically improved Na-ion storage performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Jeongeun Park, Minjun Kim, Minsu Choi, Minkyeong Ku, Dayoung Kam, Sang-Ok Kim, Wonchang Choi
Summary: Due to the abundance of sodium resources, sodium-ion batteries (SIBs) are considered a cost-efficient alternative to lithium-ion batteries for energy storage. However, the cycling stability of antimony-based anodes, which have high theoretical capacity, is poor due to rapid volume changes during charging and discharging processes. In this study, Sb/C-SiOC composites were prepared using the adsorption properties of metal-organic frameworks (MOFs) to alleviate the volume expansion. The resulting composites exhibited improved cycle performance and rate performance, making it a promising strategy for developing alloy-based energy storage materials.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Physical
Bum Chul Park, Jiung Cho, Jiliang Zhang, Mawuse Amedzo-Adore, Dae Beom Lee, Sung-Chul Kim, Jong Seong Bae, Young Rang Uhm, Sang-Ok Kim, Jehyoung Koo, Yong-Mook Kang, Young Keun Kim
Summary: The growing interest in rechargeable batteries has led to a surge in demand and price for raw materials. Researchers have found that earth-abundant iron oxyhydroxide (FeOOH) could be a potential anode material for sodium-ion rechargeable batteries (SIBs). However, the irreversible conversion reaction of FeOOH has limited its application. In this study, researchers manipulated the bio-inspired Fe redox from FeOOH-acetate hybrid nanoplatelets (FAHPs) to make the conversion reaction with sodium ions highly reversible. By exploiting the interplaying redox of inorganic and organic materials in hybrid structures, this study established a novel method to enable highly reversible conversion reactions and enhance electrochemical capacity for both sodium and lithium ions.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Physical
Dong Hyun Kim, Ji-Young Kim, Min Kyung Cho, Hyungseok Kim, Sang-Ok Kim, Kwang-Bum Kim, Kyung Yoon Chung
Summary: This study investigated the structural changes and thermal safety of Na4Co3(PO4)(2)P2O7 cathode materials for high-voltage SIBs using in situ and time-resolved X-ray diffraction. The results showed that Na4Co3(PO4)(2)P2O7 could be obtained at an optimized heating temperature, and the lattice parameters of Na4Co3(PO4)(2)P2O7 changed during charging and discharging processes. The discharge process led to a volume reduction of the material.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Nanoscience & Nanotechnology
Da-Sol Kwon, Sang Hyuk Gong, Seunghan Yun, Daun Jeong, Junhwan Je, Hee Joong Kim, Sang-Ok Kim, Hyung-Seok Kim, Jimin Shim
Summary: This study presents a sodiophilic gel polymer electrolyte for sodium metal batteries to suppress dendrite growth. By molecular-level coordination and porosity-gradient Janus structure, the formation of sodium dendrites is effectively inhibited.
ACS APPLIED MATERIALS & INTERFACES
(2022)
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)
