Article
Chemistry, Physical
Agata Baran, Michal Kniola, Tomasz Rogala, Marek Polanski
Summary: A new route of materials synthesis, high-temperature, high-pressure reactive planetary ball milling (HTPRM), is introduced in this study. It allows for the controlled mechanosynthesis of materials at temperatures up to 450 degrees C and pressures up to 100 bar of hydrogen. The successful synthesis of magnesium hydride is presented as an example of the application, demonstrating the great potential of this technique for the mechanochemical synthesis of materials.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Maria Rodriguez, Franco Niro, Guillermina Urretavizcaya, Jean-Louis Bobet, Facundo J. Castro
Summary: Magnesium-based wastes were reprocessed by mechanical milling and used to produce hydrogen through hydrolysis. The material evolved during reprocessing and hydrogen was generated in a MgCl2 solution at 24 degrees C. The particle size, crystallite size, microstrain, and phase abundance changed during mechanical processing. Hydrogen yields of 70-90% were obtained after 30 min of reaction, depending on milling time. The reaction kinetics improved with milling time, and the hydrolysis curves could be fitted with a model limited by a three-dimensional geometric contraction process. Mg17Al12 and Fe played a role in promoting hydrogen production during the reaction.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Maria Rodriguez, Guillermina Urretavizcaya, Jean-Louis Bobet, Facundo J. Castro
Summary: This paper discusses the reprocessing of Mg scraps from sacrificial anodes manufacturing by mechanical milling for the production of H2 by hydrolysis. The effects of iron and graphite as additives to improve the hydrolysis reaction are presented. It has been found that pre-milling the scraps with 1.5 wt% of Fe for 10 hours followed by an extra milling with 5 wt% of graphite for 1 hour produces the best results. The addition of Fe accelerates the reaction rate by inducing microgalvanic coupling with Mg, while graphite acts as a process control agent during milling and contributes to size reduction of the material, resulting in faster H2 production.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Chun-Liang Chen, Sutrisna
Summary: The study found that the binder phase of NiFeCoCr medium entropy alloy dispersed in W-Mo heavy tungsten alloy has a single FCC solid solution structure, and a lower Cr content encourages the dissolution of Cr into the tungsten matrix; as the sintering temperature increased to 1450 degrees C, liquid phase sintering became dominant in the model alloys, resulting in a decrease in hardness.
Article
Engineering, Chemical
N. B. Pradeep, M. M. Rajath Hegde, Shashanka Rajendrachari, A. O. Surendranathan
Summary: Nanostructured TiMgSr alloy with small crystallite size and low lattice strain was synthesized using ball milling, cold compaction, and microwave sintering. The alloy exhibited suitable densification and elastic modulus for biomedical applications.
Article
Chemistry, Physical
Jiri Cermak, Lubomir Kral, Pavla Roupcova
Summary: The study investigates the effect of the chemical composition of Mg-xCu based alloys modified by KCl on their hydrogen storage performance. It was found that an unknown Cu-rich phase exhibited a catalytic effect on desorption, and the activation energy of hydrogen desorption decreased with increasing Cu content x.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Mengru Hu, Xin Sun, Bo Li, Peng Li, Meichai Xiong, Jun Tan, Zhangze Ye, Juergen Eckert, Chu Liang, Hongge Pan
Summary: This study presents a low-cost, time-saving, and low-carbon method for synthesizing Mg(NH2)(2) through mechanochemical reaction of metallic Mg with ammonia. The synthesized Mg(NH2)(2) shows comparable hydrogen storage performance as the conventional method, providing a potential large-scale synthesis route for hydrogen storage.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Crystallography
Halit Subutay, Ilyas Savkliyildiz
Summary: By investigating the ball-milling mechanism in the Mg-6Sn-1Na ternary materials system, a suitable mechanical alloying method was found. Different structures were observed during the milling process, ultimately resulting in samples with homogeneously distributed smaller particles, which exhibited the highest density, modulus of elasticity, and hardness values.
Article
Energy & Fuels
Adam Revesz, Roman Paramonov, Tony Spassov, Marcell Gajdics
Summary: A high-energy ball milling method was used to synthesize nanocrystalline MgH2 powder samples catalyzed by Fe2Ti with different milling times (1 h, 3 h, and 10 h). The morphology and microstructure of the powders were characterized by scanning electron microscopy and X-ray diffraction. The diffraction profiles were analyzed using a convolutional multiple whole profile fitting algorithm to determine microstructural parameters of the composites. The dehydrogenation characteristics of the alloys were investigated using differential scanning calorimetry. An optimal milling time of 3 h was found to result in desorption at the lowest temperature. X-ray diffraction of partially dehydrided states confirmed a two-step H-release. The effect of milling time on the hydrogenation performance was evaluated using a Sievert-type apparatus, and the composite milled for 3 h exhibited the best overall performance.
Article
Materials Science, Multidisciplinary
Amol Kamble, Pratibha Sharma, Jacques Huot
Summary: Zirconium addition through arc-melting enables rapid hydrogen absorption, while addition through ball-milling slows down the kinetics.
FRONTIERS IN MATERIALS
(2022)
Article
Chemistry, Physical
Nilufer Kucukdeveci, Isin Akay Erdogan, Alanur Binal Aybar
Summary: The electrochemical hydrogen storage properties of 25 h milled Mg0.80Ti0.175Mn0.025ZrxNi1-x (x = 0, 0.025, 0.05, 0.1) quinary alloys were investigated. The substitution of Zr for Mg or Ni leads to an increase in structural disorder and amorphization. The Mg0.80Ti0.175Mn0.025Zr0.10Ni0.90 alloy exhibited the best discharge capacity of 604 mA h g-1 at the initial charge/discharge cycle. Using multi-component compositions is beneficial for enhancing the structural and cyclic stability of MgNi-based alloys, and substituting additive elements for Mg or Ni may offer impressive performance for efficient hydrogen storage applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Shixuan He, Guangxu Li, Ye Wang, Liu Liu, Zhaoqiu Lu, Li Xu, Peng Sheng, Xinhua Wang, Haiqiang Chen, Cunke Huang, Zhiqiang Lan, Wenzheng Zhou, Jin Guo, Haizhen Liu
Summary: TiB2 was introduced by ball milling to improve the decomposition performance of AlH3, forming Al-Ti-B solid solution through reaction. The AlH3 + 2.5 wt% TiB2 ball milled at 225 rpm for 108 min showed the best decomposition performance, starting decomposition at 78°C and stopping at 130°C with 8.5 wt% hydrogen released. This study provides an efficient strategy to achieve high hydrogen capacity and low decomposition temperature of metastable AlH3 through proper ball milling with metal borides.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Materials Science, Multidisciplinary
Sergio Gonzaga, Arturo Molina, Rene Guardian, Horacio Martinez, Edna Vazquez Velez, Jesus Santa-Olalla Tapia
Summary: Ternary Mg-Zn-Ca alloys were manufactured using mechanical alloying for potential biomedical applications. The effect of milling time, degradation in synthetic human fluids, and cytotoxicity were studied. The alloys showed improved corrosion resistance compared to pure Mg and exhibited no cytotoxicity towards human fibroblast cells. Mg65-Zn30-Ca5 and Mg70-Zn25-Ca5 alloys have good potential for biomedical applications.
Article
Chemistry, Physical
Karina Suarez-Alcantara, Nadia Isabel Flores-Jacobo, Mayara del Pilar Osorio-Garcia, Jose Gerardo Cabanas-Moreno
Summary: In this study, a mixture of Mg-15wt.% VCl3 was prepared by cryogenic ball milling and tested for hydrogen storage. The mixture displayed hydrogen uptake even at near room temperature and achieved about 5 wt.% hydrogen in 1 minute at elevated temperature and pressure. Cryomilling and VCl3 significantly improved the hydriding/dehydriding performance of Mg/MgH2.
Article
Chemistry, Physical
Magdalena Rzeszotarska, Julita Dworecka-Wojcik, Adam Debski, Tomasz Czujko, Marek Polanski
Summary: The synthesis of a complex hydride Mg-2(Fe, Cr, Ni)H-x via reactive ball milling process of AISI 316 L stainless steel and magnesium hydride was presented. The results show that the reaction between magnesium hydride and 316 L steel proceeded faster than with pure iron, resulting in a material with a cubic K2PtCl6 structure. Additionally, the obtained samples had a hydrogen content of around 4 wt% and the synthesized sample was able to absorb 1% of hydrogen at -50 degrees c through the formation of magnesium hydride.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Yanshan Lu, Hyunjeong Kim, Keiko Jimura, Shigenobu Hayashi, Kouji Sakaki, Kohta Asano
Summary: This study demonstrates that utilizing the immiscible Mg-Cr system can improve the thermodynamic and kinetic properties of Mg hydrides/deuterides. The formation of nanometer-sized MgD2 domains embedded in a Cr matrix lowers the reaction temperature and reduces the activation energy for hydrogen desorption. This novel strategy of nanostructuring MgH2 by an immiscible matrix shows promise in altering the thermodynamic and kinetic properties for solid-state hydrogen storage applications.
JOURNAL OF POWER SOURCES
(2021)
Article
Chemistry, Inorganic & Nuclear
Yanshan Lu, Kohta Asano, Herman Schreuders, Hyunjeong Kim, Kouji Sakaki, Akihiko Machida, Tetsu Watanuki, Bernard Dam
Summary: By chemically segregating Mg and Mn domains in MgxMn1-x thin films, the desorption pressure of hydrogen from MgH2 can be elevated at a certain temperature, achieving thermodynamic destabilization of metal hydrides. This strategy enables reversible hydrogen absorption and desorption by MgH2 even at room temperature.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Physical
V. Charbonnier, H. Enoki, K. Asano, H. Kim, K. Sakaki
Summary: The Ti1+yCr2-xMnx compounds with a hexagonal MgZn2-type structure were studied for potential use in metal-hydride compressor applications, with an increase in Mn content leading to higher critical temperatures and plateau pressures.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Inorganic & Nuclear
Riki Kataoka, Kohta Asano, Kouji Sakaki, Mitsunori Kitta, Kohei Tada, Tetsu Kiyobayashi, Hiroyuki Ozaki, Nobuhiko Takeichi, Shigenobu Hayashi, Toru Kimura, Atsunori Kamegawa
Summary: The stability and hydrogen distribution of a zirconium-substituted face-centered cubic yttrium hydride phase were investigated experimentally and theoretically. The study found that Zr substitution effectively reduces the occupancy of hydrogen at O-sites in the FCC YH3 structure. The experimental results were supported by theoretical analyses.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Lars J. Bannenberg, Herman Schreuders, Hyunjeong Kim, Kouji Sakaki, Shigenobu Hayashi, Kazutaka Ikeda, Toshiya Otomo, Kohta Asano, Bernard Dam
Summary: The study reveals that the nanostructuring and nanoconfinement of metal hydrides have significant impacts on their structural response to hydrogen, leading to higher hydrogen-to-metal ratio, reduced tetragonality of the fct phase, and suppressed phase coexistence. These effects ensure a hysteresis free response of hafnium to hydrogen, demonstrating remarkable performance as a hydrogen-sensing material.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Ryota Gemma, Yanshan Lu, Sascha Seils, Torben Boll, Kohta Asano
Summary: Hydrogen- and deuterium-loaded Mg0.25Mn0.75 nanocomposites were prepared by a ball-milling process. The APT analysis showed the formation of non-uniform and interconnected Mg-rich domains in the composites, likely induced by cold-rolling effects.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
V. Charbonnier, H. Enoki, K. Asano, H. Kim, K. Sakaki
Summary: Metal-hydride compressors are considered as an alternative to mechanical compressors in Hydrogen Refueling Stations. In this study, Ti-based AB(2) compounds were synthesized and their hydrogen sorption properties were evaluated. The results showed that these compounds exhibit high sorption pressure and low hysteresis. It was also found that the substitution of Al and Nb in the compounds plays an important role in reducing hysteresis and increasing sorption pressure.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Sho Takeda, Yoshikazu Ohara, Tetsuya Uchimoto, Hirotoshi Enoki, Takashi Iijima, Eri Tokuda, Takumi Yamada, Yuzo Nagatomo
Summary: This study investigated the feasibility of fusion sensing of eddy current testing (ECT) and ultrasonic testing (UT) as effective tools to clarify the hydrogen-embrittlement mechanism of austenitic stainless steels. Fatigue testing was conducted on hydrogen-charged and uncharged AISI 304 specimens. The effects of hydrogen exposure on martensitic transformation, crack closure, and crack face morphology were examined using ECT and UT.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Physics, Applied
Kohta Asano, Shigenobu Hayashi, Yumiko Nakamura, Etsuo Akiba
Summary: The diffusion and site occupation of hydrogen in the monohydride phase (β phase) of the V1-x-yCrxMoy-H (x + y <= 0.15) system were investigated using proton nuclear magnetic resonance. It was found that the substitution of both Cr and Mo offsets the change in the activation energy for hydrogen diffusion, while our previous study showed that Cr increases the activation energy and Mo decreases it. The diffusion behavior can be explained by the dimension of the interstitial sites and the weighted mean atomic radius of the substitutional metal elements, independent of their affinities for hydrogen and the lattice strain.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Ceramics
Takumi Hamaguchi, Ryusuke Nakamura, Kohta Asano, Takeshi Wada, Takeyuki Suzuki
Summary: A thin-film diffusion couple consisting of amorphous iron-boron (a-FeB) alloys with different ratios of stable isotopes of B was prepared using a sputtering technique, and the interdiffusion profiles were obtained by secondary-ion mass spectrometry to evaluate the diffusion coefficient of B in a-FeB at temperatures ranging from 533 K to 653 K. The activation energy and pre-exponential factor for diffusion were determined to be 1.51 eV and 3.0 x 10-8 m2 s-1, respectively. Comparison with reported data showed that boron is the fastest diffusing element in a-FeB, and the activation energy for B diffusion is similar to that for the crystallization of iron in alpha-FeB, suggesting that B diffusion is the rate-determining process.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2023)
Article
Chemistry, Physical
M. Legree, V Charbonnier, S. Al Bacha, K. Asano, K. Sakaki, I Aubert, F. Mauvy, J. Sabatier, J-L Bobet
Summary: Hydrolysis of Magnesium with water is a promising method for high-rate H2 production, especially when alloyed with nobler elements. This study investigated the hydrogen generation properties of Magnesium-based alloys with Long Period Stacking Ordered (14 H-LPSO) structures. The results indicated that the rare earth and transition metal elements in the LPSO structure significantly influenced the corrosion and hydrolysis properties of the alloys.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Lars J. Bannenberg, Larissa Blom, Kouji Sakaki, Kohta Asano, Herman Schreuders
Summary: Nanostructured metal hydrides have a crucial role in a hydrogen economy, as the nanostructuring or confinement of these materials significantly affects their structural and functional properties. We demonstrate that confining tantalum as a thin film extends its solubility limit, suppressing the phase transition observed in bulk upon hydrogenation. The continuous elastic deformation of the tantalum unit cell with unequal lattice constants and angles ensures volumetric expansion in the out-of-plane direction, resulting in superb performance as a hysteresis-free optical hydrogen sensor over a wide hydrogen pressure/concentration range.
ACS MATERIALS LETTERS
(2023)
Article
Chemistry, Physical
V. Charbonnier, R. Utsumi, Y. Nakahira, H. Enoki, K. Asano, H. Kim, T. Sato, S. Orimo, H. Saitoh, K. Sakaki
Summary: For high pressure MH compressor applications, it is important to understand the hydrogenation properties of MH forming compounds under high pressure and temperature conditions, which are still little studied. This study investigated a Ti0.90V0.30Mn1.00Ni0.80 compound with an AB2 structure using Sieverts' method, providing experimental evidence of the non-ideal behavior of hydrogen in the high-pressure region. The study also demonstrated the estimation of high-sorption pressures using low-pressure data and monitored the structural evolution of the compound under ultra-high hydrogen pressure.
JOURNAL OF ALLOYS AND COMPOUNDS
(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)
