Article
Materials Science, Ceramics
Meilong Chen, Mingyang Zhou, Zhijun Liu, Jiang Liu
Summary: This paper compares the performance of two proton-conducting ceramic fuel cell electrolyte materials, BZY and BZCY. The results show that while BZCY has higher conductivity, BZY exhibits greater stability in a CO2-containing environment.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Donglin Han, Lulu Jiang, Peng Zhong
Summary: This study improved the phase compatibility between BaZrO3-based electrolyte and NiO electrode substrate by adjusting the electrolyte composition and selecting proper dopants. However, high temperature heat treatment during co-sintering led to Ni diffusion into the electrolyte layer, negatively impacting performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Multidisciplinary
Saifei Pan, Jiaqi Qin, Fandi Ning, Chuang Bai, Qinlin Wen, Min Shen, Yali Li, Yujiang Song, Jiafan Chen, Yunjie Huang, Yecheng Zou, Wei Feng, Xiaochun Zhou
Summary: Ordered membrane electrode assembly (MEA) is a frontier research field in proton exchange membrane fuel cells (PEMFCs). The use of a well-dispersed Nafion array prepared by freeze-drying greatly improves the performance of PEMFC, increasing the specific surface area and electrochemical surface area of the catalyst layer significantly. This research demonstrates that the freeze-drying method effectively prevents aggregation of the Nafion array and enhances overall performance, providing an ideal basic material for the preparation of the ordered MEA.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Chemistry, Physical
Tomohiro Kuroha, Yoshiki Niina, Mizuki Shudo, Go Sakai, Naoki Matsunaga, Takehito Goto, Kosuke Yamauchi, Yuichi Mikami, Yuji Okuyama
Summary: This study investigates ceramic tape-casting and anode electrolyte co-firing for large-scale manufacturing of protonic ceramic fuel cells. It confirms the reactivity of certain metal elements with the anode material and reveals that NiO doping decreases the proton conductivity of all materials. The research identifies the suitable material BZYb20 for this fabrication technique.
JOURNAL OF POWER SOURCES
(2021)
Review
Chemistry, Applied
Bertrand Muhoza, Huang Yuyang, Angelo Uriho, Jean Damascene Harindintwali, Qian Liu, Yang Li
Summary: The charge neutralization between oppositely charged polyelectrolytes can create complex coacervate, a rich colloidal poly-electrolyte phase. Complex coacervates have the ability to encapsulate bioactive ingredients. However, drying stresses can impact the stability and release properties of these encapsulates. This review evaluates the current research on spray-and freeze-dried microcapsules prepared by complex coacervation method, exploring the effects of crosslinkers and protectants on the dried coacervated microcapsules.
FOOD HYDROCOLLOIDS
(2023)
Review
Green & Sustainable Science & Technology
Arpan Kumar Nayak, Ananta Sasmal
Summary: Recently, Perovskite oxides have been widely used in electrochemical conversion devices like Proton conducting Ceramic Fuel Cells (PCFC). Among them, barium zirconate (BaZrO3) is considered as a promising PCFC electrolyte material due to its excellent chemical stability and rapid proton diffusion. By altering the synthesis parameters and conditions, various novel synthesis techniques have been employed to prepare barium zirconate (BaZrO3) with enhanced material properties. Doping with trivalent impurities improves proton mobility and increases proton conductivity at reduced temperature, thereby expanding the scope of PCFC application with optimized output performance.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Physical
Junya Yagyu, M. Saidul Islam, Yuta Shudo, Masahiro Fukuda, Hideto Ushijima, Junya Ohyama, Shintaro Ida, Leonard F. Lindoy, Shinya Hayami
Summary: This study demonstrates the use of freeze-dried route for preparing three-dimensional graphene oxide (3DGO) with a 3D interconnected network and significant interlayer void space. The 3DGO exhibits high proton conductivity and performance in PEMFC, attributed to its facile proton conduction pathway and higher water uptake in the 3D porous architecture.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Physical
Shengjie Fan, Tingting Sun, Meng Jiang, Shijia Gu, Lianjun Wang, Wan Jiang
Summary: Germanium telluride (GeTe) has recently gained a lot of attention as a promising lead-free mid-temperature thermoelectric material. However, high carrier concentration and thermal conductivity have hindered its widespread use. This study successfully achieved the uniform dispersion of 2D material MXene in GeTe, leading to improved electron and thermal transport properties. The incorporation of MXene resulted in decreased carrier concentration and thermal conductivity, leading to significant enhancement in the performance of GeTe-based thermoelectric materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Multidisciplinary
Yu Han Wang, Qing He, Zhi Xie
Summary: This paper proposes a pixel-based grain boundary extraction method to solve the problems of grain boundary fracture and pseudo-grain boundary. By rough extraction and information extraction based on pixel relationship, the proposed method can obtain complete and continuous grain boundaries with high accuracy and versatility.
Article
Materials Science, Ceramics
Kiryl Zakharchuk, Aleksey Yaremchenko, Andrei Kovalevsky
Summary: Efficient use of barium-containing electrocatalysts for NOx decomposition in electrochemical solid oxide cells requires good chemical compatibility and porous electrolytes. This study focuses on processing guidelines for BaZr0.85Y0.15O3 ceramics with cellular porosity using emulsification. The results show that the porosity and permeability of the ceramics depend on the surfactant and paraffin content.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Yifeng Li, Shihang Guo, Donglin Han
Summary: In this study, researchers found that there was good chemical compatibility between NiO and BaZr0.8Yb0.2O3 or BaZr0.8Tm0.2O3 at 1500 degrees Celsius. Additionally, BaZr0.8Y0.1Yb0.1O3 and BaZr0.8Y0.12Yb0.08O3 showed good chemical compatibility with NiO at 1350 and 1500 degrees Celsius. The co-doped BaZrzYxYb0.2-xO3 electrolyte exhibited higher conductivity compared to BaZr0.8Y0.2O3, with BaZr0.8Y0.1Yb0.1O3 showing the highest conductivity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Food Science & Technology
Patroklos Vareltzis, Aggelos Stergiou, Kallirhoe Kalinderi, Maria Chamilaki
Summary: The aim of this study was to find a use for the solid waste generated from the extraction of oregano essential oils. The researchers optimized the ultrasound extraction of antioxidants from the waste and evaluated the effects of different drying methods on the extract's properties. The results showed that the dried extract obtained through ultrasound-assisted process had good antioxidant activity and could be used as a natural alternative to synthetic antioxidants.
Article
Biochemistry & Molecular Biology
Kaiting Zhang, Beibei Weng, Dao Cheng, Yong Guo, Tong Chen, Li Wang, Chenxin Wang, Runmin Xu, Yuxia Chen
Summary: The study explored the modification of luffa sponge fibers using different chemical treatments and drying methods, finding that freeze-drying maintained fiber cell integrity, improved tensile properties and thermal stability, reduced moisture absorption rates, and enhanced the performance of composite materials.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Pharmacology & Pharmacy
Eetu Valkama, Ondrej Haluska, Vesa-Pekka Lehto, Ossi Korhonen, Katja Pajula
Summary: The study demonstrates the feasibility of producing stable amorphous solid dispersions from practically water insoluble drug compounds using freeze-drying method with DMSO solutions. The developed method results in amorphous binary solid dispersions that remain stable at room temperature, suitable for further research purposes.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2021)
Review
Energy & Fuels
D. Vignesh, Ela Rout
Summary: Proton conductors (PCs) are versatile materials used in proton conducting solid oxide fuel cells (PC-SOFC). While PCs offer advantages in PC-SOFC applications, they also have limitations, such as the trade-off between proton conductivity and chemical stability. The different reactive constituents in PCs lead to varying chemical stability under different conditions, affecting proton conductivity. Material engineering through acceptor defect substitutions can improve protonation and charge dynamics, but it presents challenges at higher dopant volume fractions. Understanding the factors contributing to structural and electrophysical diversities in PCs is important for future research and advanced energy applications.
Article
Physics, Applied
Taro Kuwano, Ryoji Katsube, Steve Johnston, Adele C. Tamboli, Yoshitaro Nose
Summary: ZnSnP2, an emerging inorganic material for solar cells, was characterized using DLTS and PL, revealing shallow acceptor- and donor-like traps, as well as a deep level trap. These traps may result from defects in the material, leading to a shorter minority carrier lifetime.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Susumu Imashuku
Summary: The study demonstrates the possibility of distinguishing MgO center dot Al2O3 spinel particles and layer in MgO refractory for aluminum deoxidation process of stainless steel based on their luminescence colors in cathodoluminescence and X-ray excited optical luminescence images. The images can be acquired quickly within 2 seconds and 1 minute. Surface examination aids in precise identification, and XEOL imaging shows promise for nondestructive onsite evaluation of the MgO refractory.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2022)
Article
Chemistry, Physical
Issei Suzuki, Zexin Lin, Sakiko Kawanishi, Kiyohisa Tanaka, Yoshitaro Nose, Takahisa Omata, Shin-Ichiro Tanaka
Summary: Valence band dispersions of single-crystalline SnS1-xSex solid solutions were observed using ARPES, and the hole effective masses were directly evaluated. It was found that the hole effective masses decrease slightly with increasing Se content in the low Se composition range, but sharply in the high Se composition range.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Metallurgy & Metallurgical Engineering
Susumu Imashuku, Kazuaki Wagatsuma
Summary: This study proposes a method to correct the overestimated area of free lime in steelmaking slag by investigating the grain-boundary microstructures and using scanning transmission electron microscope observation. The actual thickness of free lime was found to be approximately 20 times smaller than the evaluation done via cathodoluminescence imaging. By assuming an overall thickness of 250 nm, the corrected area fractions decreased by 60%-80%. This method can determine the volume fraction of free lime in steelmaking slag more precisely, which helps prevent road expansion in the reuse of steelmaking slag.
ISIJ INTERNATIONAL
(2022)
Review
Metallurgy & Metallurgical Engineering
Susumu Imashuku, Kazuaki Wagatsuma
Summary: This paper reviews three emission spectrometric methods that can be used for inclusion analysis in steel materials, providing information on the number, size, distribution, and chemical composition of inclusion particles. Cathodoluminescence (CL), X-ray-excited optical luminescence (XEOL), and beam-scanning laser-induced breakdown spectrometry (LIBS) are employed for the imaging measurement of the inclusions. Alumina inclusions are evaluated as a typical specimen to compare their analytical performance. The ease of handling and rapid response are significant features for on-site/in-line analysis in steel production.
ISIJ INTERNATIONAL
(2022)
Article
Metallurgy & Metallurgical Engineering
Susumu Imashuku, Kazuaki Wagatsuma
Summary: The removal of Al2O3 and MgO·Al2O3 spinel inclusions is critical in stainless steel production. Understanding their formation mechanism is important for their removal, which can be facilitated through the use of novel analytical methods like cathodoluminescence imaging to distinguish between different types of inclusions. This method provides a better understanding of the composition and distribution of these inclusions in stainless steels.
ISIJ INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Susumu Imashuku
Summary: Identifying low-melting CaO-MgO-SiO2 phases is crucial for MgO-C refractories used in the steelmaking process as they accelerate the corrosion of the refractories. This study proposes the use of cathodoluminescence (CL) imaging for the rapid identification of these phases at the reaction interface between MgO-based refractory and steelmaking slag.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
Susumu Imashuku, Kazuaki Wagatsuma
Summary: This paper presents a method for rapidly identifying and determining the f-MgO content in industrial steelmaking slag using a scanning microscopy-cathodoluminescence (SEM-CL) instrument. The proposed method distinguishes f-MgO from other minerals by observing the colors and contrast of images, and determines the f-MgO content based on the identified areas.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2022)
Article
Spectroscopy
Susumu Imashuku, Haruka Narita, Kazuaki Wagatsuma
Summary: This study explored the use of optical emission spectroscopy for in situ elemental analysis of films and proposed a method for selecting emission lines to determine film composition. The results showed that the conventional method did not yield the highest R-2 value, while selecting the intensity ratio of Cu I lines to Zn I lines with high R-2 values could determine the composition of the deposited films in real time.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2022)
Article
Metallurgy & Metallurgical Engineering
Susumu Imashuku, Michihisa Fukumoto, Kano Nakajima, Shigeru Suzuki
Summary: This study investigated the formation of structural isomers of alumina (Al2O3) on the surfaces of Fe-Cr-Al alloys using various techniques. Different phases of Al2O3 were formed at different annealing temperatures, and the properties of Al2O3 were studied using CL and XPS techniques.
ISIJ INTERNATIONAL
(2022)
Article
Spectroscopy
Susumu Imashuku
Summary: This study presents a method of using cathodoluminescence (CL) imaging to identify and estimate the rough content of bastnaesite in mineral ores. By analyzing CL images and spectra emitted by minerals, the author found that bastnaesite can be identified by detecting specific luminescence colors and areas in the images. This approach can greatly reduce the time required to explore mines with potential REE reserves.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Physics, Applied
Isshin Sumiyoshi, Yoshitaro Nose
Summary: We investigated the minority carrier lifetime and behavior of lattice defects in ZnSnP2 bulk crystals and found that an electron trap with a short time constant contributes to the short carrier lifetime. The recombination through this trap is nonradiative, resulting in lower current density in ZnSnP2 solar cells. By preparing crystals under conditions with higher chemical potential of Zn, we achieved an enhancement of carrier lifetime and demonstrated an improvement in current density in ZnSnP2 solar cells.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Susumu Imashuku
Summary: The composition of Cu-Zn films can be determined by measuring the emission line intensities of Cu and Zn during sputter deposition. A new method was developed to extend the applicability of this method to a wider range of film compositions and different chamber pressures. By evaluating the linearity between the emission intensity ratio of Ni/Cu lines and the atomic ratio of Ni/Cu in the films, the composition of Ni-Cu films can be accurately determined regardless of the chamber pressure.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2023)
Article
Chemistry, Analytical
Susumu Imashuku, Takumi Kamimura, Tetsu Ichitsubo, Kazuaki Wagatsuma
Summary: In this study, a method for measuring three-dimensional hydrogen distribution in a Ni-MH battery cathode using LIBS was presented. The hydrogen distribution was converted to a state-of-charge distribution to interpret the reaction distribution in the cathode. The results showed that the method can help understand the deterioration mechanism of the Ni-MH battery and improve its cycle life and capacity.
Article
Nanoscience & Nanotechnology
Susumu Imashuku, Takumi Kamimura, Tomoya Kawaguchi, Tetsu Ichitsubo
Summary: For the development and maintenance of materials and infra-structures that enable the realization of hydrogen society, an analytical technique capable of determining hydrogen distribu-tion is highly desirable. Recently, we have developed a method using laser-induced breakdown spectroscopy (LIBS) for the quantitative determination of the three-dimensional hydrogen distribution; however, the validity of the method was not completely confirmed. Herein, we demonstrate the validity of the hydrogen mapping method using LIBS by comparing the hydrogen mapping and a surface photographic image of an electrodeposited Ni(OH)(2) cathode that was subjected to charge-discharge reaction cycles.
E-JOURNAL OF SURFACE SCIENCE AND NANOTECHNOLOGY
(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)
