Article
Chemistry, Physical
Pawan K. Soni, Ashish Bhatnagar, M. A. Shaz
Summary: In this study, the synergistic effect of Fe nanoparticles and hollow carbon spheres composite on the hydrogen storage properties of MgH2 was investigated. The MgH2-Fe-HCS system exhibited an onset desorption temperature of 225.9 degrees C and a hydrogen storage capacity of 5.60 wt%. The MgH2-Fe-HCS composite absorbed 5.60 wt% hydrogen within 55 s and desorbed 5.50 wt% hydrogen within 12 min under 20 atm H2 pressure at 300 degrees C. The desorption activation energy of MgH2-Fe-HCS was found to be 84.9 kJ/mol. The composite also showed better cyclability up to 24 cycles of hydrogenation and dehydrogenation of MgH2.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Nigel Rambhujun, Kondo-Francois Aguey-Zinsou
Summary: By tuning the chemical structure and activation energy of Grignard reagents, efficient generation of magnesium and its hydride can be achieved. For example, di-tert-butylmagnesium can decompose at low temperatures to produce MgH2 and release hydrogen at lower temperatures.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Energy & Fuels
Ihor Zavaliy, Vasyl Berezovets, Roman Denys, Oleksandr Kononiuk, Volodymyr Yartys
Summary: The catalytic effect of eta-Zr3V3O0.6 mixed suboxide and graphite additives on MgH2 properties in hydrogen storage and generation processes was investigated. Hydride composites were obtained by reactive ball milling and characterized using XRD and SEM. The addition of Zr3V3O0.6 and graphite significantly enhanced hydrogen absorption and desorption rates, as well as lowered the activation energy and desorption temperature. The synthesized composite showed improved kinetics and enhanced hydrogenation capacity, making it a promising material for hydrogen storage. The catalytic composites also exhibited efficient hydrogen generation in hydrolysis reaction. Overall, the research received a rating of 8 out of 10.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Physical
Quanhui Hou, Jiaqi Zhang, XinTao Guo, Guanzhong Xu, Xinglin Yang
Summary: In this study, a low-cost biomass charcoal (BC)-based nickel catalyst (Ni/BC) was introduced into the MgH2 system by ball-milling, which significantly improved the hydrogen desorption and absorption kinetics of MgH2. The Ni/BC catalyst enhanced the release of hydrogen at lower temperatures and achieved a high proportion of dehydrogenation within a short time. Moreover, it enabled hydrogen absorption at low temperatures and rapid absorption under specific conditions. The catalyst reduced the activation energy and improved the cycle stability of MgH2.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Energy & Fuels
Haoyuan Li, Qiang Fu, Hongyun Qin, Xia Chen, Qicheng Zhang, Hui Zhang, Shoudong Wang, Zixu Dong, Ming Wang
Summary: In this study, the controllable and continuous MgH2 hydrolysis was achieved by using an optimized porous filter element, which provides valuable reference for continuous MgH2 hydrolysis.
Article
Metallurgy & Metallurgical Engineering
Yaokun Fu, Lu Zhang, Yuan Li, Sanyang Guo, Han Yu, Wenfeng Wang, Kailiang Ren, Wei Zhang, Shumin Han
Summary: Hydrogen storage is a crucial aspect of the hydrogen economy, and solid-state hydrogen storage is the most promising approach. In this study, a ternary transition metal sulfide FeNi2S4 with a hollow balloon structure was designed as a catalyst for MgH2 to enhance its dehydrogenation/hydrogenation performance by constructing a MgH2/Mg2NiH4-MgS/Fe system.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Engineering, Environmental
Mingxing Wei, Yijin Liu, Xiaofei Xing, Zhao Zhang, Tong Liu
Summary: By introducing a specially designed and synthesized high-entropy alloy catalyst, the hydrogen storage properties of MgH2 have been significantly improved, resulting in faster absorption and desorption rates, lower activation energy, and high capacity retention.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Caique Diego de Abreu Lima, Roniel dos Santos Sousa, Antonio Werbeson Miranda, Joao Victor Barbosa Moura, Gardenia de Sousa Pinheiro, Bartolomeu Cruz Viana, Iara Souza Lima, Thiago Mielle Brito Ferreira Oliveira, Oswaldo Baffa, Jefferson Ferraz Damasceno Felix Araujo, Cleanio da Luz Lima
Summary: This study investigated the synthesis, characterization, and thermal stability of pure and Al ion-exchange titanate nanotubes (Na2Ti3O7 and NaxAlyTi3O7, respectively). The results revealed the obtainment of sodium titanate and aluminum titanate nanotubes with different average lengths and diameters. The presence of Al ions in the crystal lattice affected the energy exchange between the unpaired species and the lattice. The thermal stability of sodium titanate nanotubes was influenced by sodium ions, while the incorporation of Al3+ ions into the nanotube lamellae decreased the thermal stability of aluminum titanate nanotubes.
SOLID STATE SCIENCES
(2023)
Article
Metallurgy & Metallurgical Engineering
N. A. Ali, N. A. Sazelee, M. F. Md Din, M. M. Nasef, A. A. Jalil, Haizen Liu, M. Ismail
Summary: Zinc titanate synthesized by the solid-state method can effectively lower the initial temperature for dehydrogenation and enhance the re/dehydrogenation behavior of MgH2. The addition of Zn2TiO4 significantly reduces the dehydrogenation starting temperature of MgH2 and improves its kinetics performance, allowing for faster hydrogen absorption and release.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Chemistry, Physical
V. V. Berezovets, R. Denys, I. Yu Zavaliy, Yu Kosarchyn
Summary: MgH2-based nanocomposites were synthesized using reactive ball milling and various catalytic additives. The additives improved the hydrogen absorption-desorption kinetics and stability of the composites. Nano-Ti showed the most stable hydrogen absorption-desorption characteristics compared to TiO2 and Ti4Fe2Ox additives.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
N. Y. Yusnizam, N. A. Ali, N. A. Sazelee, M. M. Nasef, A. A. Jalil, M. Ismail
Summary: This study investigated the effect of barium cobalt fluoride (BaCoF4) on the de-/rehydrogenation properties of magnesium hydride (MgH2) for the first time. The addition of 10 wt% BaCoF4 significantly enhanced the de-/rehydrogenation kinetics and hydrogen absorption capacity of MgH2. BaCoF4 lowered the desorption temperature, improved the sorption kinetics, and reduced the activation energy for hydrogen desorption of MgH2 by forming CoF3 and Ba or Ba-containing species.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Energy & Fuels
Zhichao Yu, Xin Liu, Yang Liu, Yuan Li, Zhuohan Zhang, Kangli Chen, Shumin Han
Summary: The hydrogen absorption/desorption kinetics of MgH2 can be significantly improved by using Ni@C@CeO2 as the catalyst. The composites, with 10 wt% Ni@C@CeO2 doped, can absorb 4.51 wt% hydrogen within 60 min at 75 degrees C and release approximately 4.88 wt% hydrogen within 10 min at 325 degrees C. In addition, the composites show excellent cycling performance with no decrease in hydrogen storage capacity, hydrogen uptake rate, and hydrogen release rate after ten cycles at 350 degrees C. The in-situ formation of Mg2NiH4/Mg2Ni and CeH2.73 phases enhances the hydrogen pump effect and accelerates the conversion of Mg2Ni/Mg2NiH4, which contributes to the improved hydrogen storage performance of MgH2.
Article
Chemistry, Physical
Kudzaishe Caren Tome, Senliang Xi, Yuanyi Fu, Chang Lu, Ni Lu, Meili Guan, Shixue Zhou, Hao Yu
Summary: This study investigates the catalytic effect of Ni and ZrO2 nanoparticles on the hydrogen absorption and desorption properties of MgH2. The nanocomposites were prepared using high-energy ball-milling and characterized by various techniques. The homogenous dispersion of ZrO2 and Ni nanoparticles in the MgH2 matrix significantly decreases the apparent activation energy for dehydrogenation, resulting in improved hydrogenation and dehydrogenation kinetics.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Chengshang Zhou, Ke Li, Tongwen Huang, Pei Sun, Li Wang, Yanshan Lu, Zhigang Zak Fang
Summary: This study demonstrates the in situ formation of nanocrystalline MgH2 by hydrogenation at room temperature and investigates the effects of hydrogenation variables on the nanostructure. The results show that hydrogenated samples under lower pressure have larger MgH2 nanocrystallites and improved dehydrogenation kinetics. The study identifies hydrogenation pressure, temperature, and defect density as critical parameters affecting the nucleation rate of MgH2.
MATERIALS & DESIGN
(2022)
Article
Chemistry, Multidisciplinary
Juyoung Kim, Julien O. Fadonougbo, Jee-Hwan Bae, Min Kyung Cho, Jaeyoung Hong, Young Whan Cho, Jong Wook Roh, Gyeung Ho Kim, Jun Hyun Han, Young-Su Lee, Jung Young Cho, Kyu Hyoung Lee, Jin-Yoo Suh, Dong Won Chun
Summary: This study reports real-time observations of the dehydrogenation of a Mg2FeH6-MgH2 composite using in situ transmission electron microscopy (TEM) with advanced spatial and temporal resolution. Through careful control and systematic variations of the reaction temperature and electron dose rate, the characteristic decomposition of Mg2FeH6 into Mg and Fe on the nanometer scale is visualized. The formation and growth of nanostructured Fe clusters in Mg metal during dehydrogenation are verified, and the desorption kinetics of the two coexisting phases are separately evaluated. These findings provide useful guidelines for designing hydrogen sorption conditions and improving solid-state hydrogen storage systems.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Oncology
Bernard Lamien, Helcio Rangel Barreto Orlande, Leonardo Antonio Bermeo Varon, Rodrigo Leite Queiroga Basto, Guillermo Enrique Elicabe, Dilson Silva dos Santos, Renato Machado Cotta
INTERNATIONAL JOURNAL OF HYPERTHERMIA
(2019)
Article
Materials Science, Multidisciplinary
Amanda Ventura Castilho, Dilson Silva dos Santos
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2019)
Article
Chemistry, Physical
J. S. Belo, S. C. Marques, A. Castilho, L. M. de Oliveira, R. A. Simao, D. S. dos Santos
JOURNAL OF ALLOYS AND COMPOUNDS
(2020)
Article
Materials Science, Ceramics
Maria Eliza Steling Rego, Paula Nunes Guimaraes Paes, Fabiana Ribeiro da Silva Schanuel, Paula Mendes Jardim
Summary: The study investigated the effects of the SIE protocol steps on the topography of Y-TZP and its bond strength to resin cement. The results showed that exposure to 10% HF for sufficient time can etch zirconia at room temperature, leading to significant improvement in bond quality.
CERAMICS INTERNATIONAL
(2021)
Article
Multidisciplinary Sciences
Claudia C. R. Cruz, Nilton P. da Silva, Amanda Castilho, Viviane A. Favre-Nicolin, Claudio L. Cesar, Helcio R. B. Orlande, Dilson S. Dos Santos
SCIENTIFIC REPORTS
(2020)
Article
Materials Science, Multidisciplinary
Debora Lima Molter, Mario Augusto Lopes de Castro, Dilson Silva dos Santos
Summary: This paper investigates the hydrogen embrittlement of S13Cr supermartensitic stainless steel under various cathodic potentials through experimental procedures and numerical analyses. The study reveals hydrogen diffusion behavior, deep traps existence, and the impact of hydrogen embrittlement on ductility.
Article
Nanoscience & Nanotechnology
Sara Correa Marques, Amanda Ventura Castilho, Dilson S. dos Santos
Summary: The impact of alloy element concentration on hydrogen diffusivity and trapping for two high-entropy alloys was investigated, with the difference mainly attributed to the decrease in Cr and its strong interaction with hydrogen in solid solution. Comparisons with traditional steels as a function of Cr % further supported this analysis.
SCRIPTA MATERIALIA
(2021)
Article
Environmental Sciences
Beatriz P. de Oliveira, Lorena C. S. Balieiro, Lana S. Maia, Noelle C. Zanini, Ericson J. O. Teixeira, Monique O. T. da Conceicao, Simone F. Medeiros, Daniella R. Mulinari
Summary: The search for sustainable materials in the construction sector has led to the investigation of natural materials with specific properties. This research focuses on the addition of acai waste to castor oil-based polyurethane to improve its properties. The results show that the addition of fiber reduces pore size, improves crystallinity and hydrophobicity, while also decreasing compressive strength and increasing impact resistance.
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
(2022)
Article
Materials Science, Multidisciplinary
Jessica Dornelas Silva, Gisele Fernandes Chaves Macieira, Dilson Silva dos Santos, Leandro de Arruda Santos, Vicente Tadeu Lopes Buono
Summary: Ti52-xNi38Cu10Nbx alloys with Nb additions were produced and their phase constitution and morphology were investigated. The study demonstrated the importance of metastable phases and Nb content in the solidification sequence, phase distribution, and morphology of the alloy.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Physical
Isabela da Rocha Silva, Aline Tavares da Silva Barreto, Renata Santos Seixas, Paula Nunes Guimaraes Paes, Juliana do Nascimento Lunz, Rossana Mara da Silva Moreira Thire, Paula Mendes Jardim
Summary: The modification of topography and chemical composition of titanium implants is crucial for improving their biocompatibility and bioactivity, promoting osseointegration, and determining clinical success. However, bacterial contamination remains a common cause of failure. This study proposed a surface treatment for titanium implants to enhance osseointegration and reduce bacterial colonization by locally releasing antibiotics.
Article
Materials Science, Multidisciplinary
B. B. Freitas, L. R. O. Costa, T. A. A. dos Santos, D. S. dos Santos
Summary: The effect of hydrogen embrittlement on API 5L X70 steel was investigated. The results showed that the steel was able to solubilize hydrogen, reducing its impact on embrittlement.
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jessica Dornelas Silva, Dilson Silva dos Santos, Leandro de Arruda Santos, Vicente Tadeu Lopes Buono
Summary: The solidification process of Ti52-xNi38Cu10Nbx alloys was evaluated using the CALPHAD method and microstructural analyses. TiNi, β-Nb/Ti, and Ti2Ni were observed as the phases. The TiNi phase acted as the matrix phase with similar Ti and Ni contents at different Nb levels. Enrichment of Ti content and depletion of Ni were expected during the solidification of the TiNi phase. The formation of Ti2Ni and β-Ti was related to the excess of Ti, while increasing Nb content hindered the formation of Ti2Ni and favored β-Ti formation. The TiNi/β-Nb eutectic was formed due to Ni depletion and Nb accumulation, and coherent ratios were obtained when Cu was considered as a substitute for Ni and Nb for Ti.
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2023)
Proceedings Paper
Computer Science, Artificial Intelligence
Leonardo A. Bermeo Varon, Bruna R. Loiola, Luiz A. da Silva Abreu, Bernard Lamien, Nilton Pereira da Silva, Helcio R. B. Orlande, Dilson Silva dos Santos
XV MEDITERRANEAN CONFERENCE ON MEDICAL AND BIOLOGICAL ENGINEERING AND COMPUTING - MEDICON 2019
(2020)
Article
Materials Science, Multidisciplinary
Anderson de Farias Pereira, Sidnei Paciornik, Dilson Silva dos Santos, Paula Mendes Jardim
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2019)
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)