Article
Chemistry, Physical
J. L. Snider, T. M. Mattox, Y-S Liu, L. F. Wan, P. Wijeratne, M. D. Allendorf, V Stavila, B. C. Wood, L. E. Klebanoff
Summary: The study reveals that LiH/MgB2 and TiH2 have different effects on the hydrogen storage properties of MgB2, with LiH/MgB2 showing higher reactivity in the surface and near-surface regions, while TiH2 does not significantly aid MgB2 hydrogenation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Viktor N. Kudiyarov, Roman R. Elman, Nikita E. Kurdyumov
Summary: Magnesium hydride is a promising hydrogen storage material, and adding nanocarbon materials like carbon nanotubes can reduce the activation energy of hydrogen desorption and improve hydrogen storage properties. It is important to investigate the effect of nanocarbon additives on the hydrogen desorption temperature and activation energy under various synthesis parameters.
Article
Chemistry, Physical
Soufiane Bahou, Hicham Labrim, Marwan Lakhal, Mohamed Bhihi, Bouchaib Hartiti, Hamid Ez-Zahraouy
Summary: By studying the effect of magnesium vacancies and hydrogen doping on magnesium hydride, it is found that they contribute to enhancing the hydrogen storage properties of the hydride by reducing desorption temperature and stability. It is noteworthy that controlling the concentrations of magnesium vacancies and hydrogen dopant atoms can regulate the desorption temperature, optimizing the practical application of the hydride in fuel cell vehicles.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
J. L. Snider, T. M. Mattox, Y-S Liu, L. F. Wan, P. Wijeratne, M. D. Allendorf, V Stavila, B. C. Wood, L. E. Klebanoff
Summary: LiH significantly improves the hydrogenation of MgB2, lowering the temperature and without forming undesirable intermediates, while TiH2 is essentially inert when mixed with MgB2 during high-pressure hydrogenation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Hui Luo, Yunshu Yang, Liwen Lu, Guangxu Li, Xinhua Wang, Xiantun Huang, Xiaoma Tao, Cunke Huang, Zhiqiang Lan, Wenzheng Zhou, Jin Guo, Haizhen Liu
Summary: In this study, a two-dimensional Ti3CN MXene was synthesized and added to the Li-Mg-B-H composite, resulting in a reduction in the dehydrogenation temperature and induction period of the composite. The reversible capacity and capacity retention ratio of the composite were maintained at high levels. Micro-structure studies revealed the transformation of Ti3CN into highly-dispersed nano-TiB2, which acted as an active catalyst to improve the kinetics and reversibility of the composite. This research provides insights into the role of MXene in tailoring the hydrogen storage properties of metal borohydride-based composites.
APPLIED SURFACE SCIENCE
(2023)
Article
Energy & Fuels
N. S. C. Mazlan, F. A. Halim Yap, M. S. Yahya, S. B. Mohamed, N. A. Sazelee, N. A. Ali, I. Jusoh, M. Ismail
Summary: This study focuses on the catalytic effect of TiF3 on the hydrogen storage properties of the MgH2-Na3AlH6-LiBH4 system produced by ball milling. The addition of TiF3 catalyst results in a faster hydrogen uptake and release rate compared to the catalyst-free system. The apparent activation energy for the dissociation of Li3AlH6, MgH2, and NaBH4 in the TiF3-doped composite is significantly reduced. TiF3's catalytic performance is attributed to the in-situ production of Al-Ti and Al-F phases during the dehydrogenation process.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Physical
Jonathan T. Lyon
Summary: Transition metal doped magnesium hydride solids are a promising candidate for hydrogen storage materials. Through theoretical studies on MgScHn clusters using density functional theory and Moller-Plesset perturbation theory, it was found that hydrogen binds successively to the MgSc diatomic metal center up to MgScH13 before dissociating from larger clusters. The analysis of frontier orbitals and natural bonding supports the logical dissociation pathway observed in these clusters.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Joshua Adedeji Bolarin, Zhao Zhang, Hujun Cao, Zhi Li, Teng He, Ping Chen
Summary: This research focuses on the catalytic behavior of ferroelectric BaTiO3 nanomaterial in the separation of MgH2, improving sorption kinetics and reversibility. The study highlights the significance of titanium states and oxygen vacancies in BaTiO3 twin boundaries for Mg/MgH2 system improvement. Additionally, the anomalous ferroelectric character of barium around Ti-O post-milling of BaTiO3 enhances MgH2 desorption enthalpy slightly.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
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
Chemistry, Physical
Fatemeh Zahra Akbarzadeh, Mohammad Rajabi
Summary: This study utilized mechanical alloying to synthesize magnesium-based nanocomposites for hydrogen storage, and investigated the hydrogen desorption properties of the prepared nanocomposites through experiments and molecular dynamics simulations.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Zhongliang Ma, Jinlian Ni, Zhao Qian, Jiangchuan Liu, Yunfeng Zhu, Jiguang Zhang, Hai-Wen Li, Yana Liu, Zhixin Ba, Liquan Li
Summary: Doping a catalyst can improve the hydrogen reaction kinetics of MgH2, but the hydrogen desorption behaviors in different MgH2-catalyst systems are complicated. A carbon-encapsulated nickel (Ni@C) core-shell catalyst is synthesized to enhance the hydrogen storage properties of MgH2. The study provides new insights into the hydrogen desorption behaviors and reveals the short-range nanoreaction effect in the MgH2-catalyst system.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Zhonghui Sun, Jia Zhou, Qingan Zhang
Summary: A new MgH2-PrF3-Al-Ni composite was prepared by ball milling under hydrogen atmosphere. The composite exhibited improved hydrogen absorption-desorption properties and cycle stability, attributed to the synergetic effect of the in situ formed nanoparticles. This work provides inspiration for enhancing hydrogen storage properties in Mg-based materials.
PROGRESS IN NATURAL SCIENCE-MATERIALS INTERNATIONAL
(2021)
Article
Engineering, Environmental
Yongyang Zhu, Shaoyang Shen, Liuzhang Ouyang, Jiangwen Liu, Hui Wang, Zhenguo Huang, Min Zhu
Summary: This study reports an economical method to synthesize Mg(BH4)(2) by converting B-O bonds in widely available borates or boric acid to B-H. This method avoids expensive boron sources and high pressure and temperature conditions, significantly reducing costs, and could be an alternative to the current synthesis processes of Mg(BH4)(2).
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Keisuke Yoshida, Kosuke Kajiwara, Hisashi Sugime, Suguru Noda, Nobuko Hanada
Summary: The study proposes using hydrogen as a heat transfer medium to supply waste heat to hydrogen storage tanks, with hot hydrogen flowing through porous MgH2 sheets for efficient convective and conductive heat transfer. Numerical verification confirmed the feasibility of hydrogen desorption reaction, which was found to be affected by MgH2 sheet thickness and hot hydrogen flow speed.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Physical
Anish Tiwari, Shivani Agarwal, Kriti Shrivastava, Takayuki Ichikawa, Ankur Jain, Rini Singh
Summary: The KSiH3 system has superior hydrogen storage properties, making it a potential material for practical hydrogen storage. However, the activation barrier of the reaction restricts its reversible absorption and desorption of hydrogen at elevated temperatures. Catalysts can be used to enhance its kinetic properties, and in this work, Zr-based catalysts were used to reduce the activation energy.
Article
Chemistry, Physical
Shashi Sharma, Rini Singh, Takayuki Ichikawa, Ankur Jain, Shivani Agarwal
Summary: Hydrogen as an energy carrier has great potential for future energy infrastructure. The storage of hydrogen in solid state materials, such as KSiH3, has been proposed as a safe method. In this study, vanadium-based catalysts, particularly V2O5, were added to enhance the kinetics and reduce the activation energy of the KSiH3 system. The addition of V2O5 catalyst enabled hydrogen desorption at lower temperatures and achieved a high weight loss close to the theoretical value, indicating improved reversibility and hydrogen storage capacity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Pratibha Pal, Shivani Agarwal, Ajay Tiwari, Takayuki Ichikawa, Ankur Jain, Ambesh Dixit
Summary: The catalytic effects of exfoliated graphite and graphene nanoballs on the dehydrogenation kinetics of magnesium hydride were investigated. The results showed that the addition of catalysts significantly improved the dehydrogenation kinetics and reduced the activation energy. Graphene nanoballs modified magnesium hydride system exhibited the lowest onset dehydrogenation temperature, indicating better dehydrogenation performance compared to pure magnesium hydride.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Fangqin Guo, Hikaru Oyama, Hiroyuki Gi, Kyohei Yamamoto, Shigehito Isobe, Tomoyuki Ichikawa, Hiroki Miyaoka, Takayuki Ichikawa
Summary: The corrosion of carbide/nitride/oxide-based reactor materials was investigated to address the corrosion problems in sodium redox reactions for thermochemical hydrogen production. Different types of materials were evaluated for their corrosion resistance, and it was found that AlN exhibited the highest resistance among all the nitrides.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Keita Shinzato, Kentaro Tagawa, Koki Tsunematsu, Hiroyuki Gi, Pankaj Kumar Singh, Takayuki Ichikawa, Hiroki Miyaoka
Summary: The pseudo-catalytic properties of lithium-based alloys with group 14 elements were investigated for ammonia synthesis. The reaction temperature and the formation of products depend on the composition of the alloy, and the metallic feature of lithium species plays a significant role in the reaction. Furthermore, ammonia synthesis can also be achieved at lower temperatures through a catalytic process using a mixture of hydrogen and nitrogen.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Biochemistry & Molecular Biology
Pranjal Pathak, Kriti Shrivastava, Takayuki Ichikawa, Ankur Jain, Rini Singh
Summary: This paper investigates the issues of solid-state hydrogen absorption systems in hydrogen storage technology, and finds that combining LiNH2 with KH and NaH can lower the hydrogenation temperature. Through thermal and morphological studies, the eutectic phenomenon is observed and a phase diagram is constructed.
Article
Energy & Fuels
Yu Jin, Hongliang Luo, Gengxin Zhang, Chang Zhai, Yoichi Ogata, Yukihiko Matsumura, Takayuki Ichikawa, Yutaka Nakashimada, Wookyung Kim, Keiya Nishida
Summary: Nowadays, reducing carbon emissions is a global concern. To achieve carbon neutrality by the mid-21st century, a regional energy system has been designed to develop a carbon recycling system using fermented gaseous fuels for electricity generation. Hydrogen (H-2) addition is commonly used to improve the efficiency of methane (CH4) combustion in engines. However, the varying ignition timings for maximum brake torque (MBT) and brake thermal efficiency (BTE) have not received much attention. This study examines the effect of ignition timing on CH4 combustion with H-2 addition using experiments conducted on a spark ignition engine. The results show that advancing the ignition timing can achieve higher efficiency when using CH4 alone at higher air ratios (lambda). However, when H-2 is added, retarding the ignition timing results in higher BTE from 10% to 50% H-2 addition. The study also maps the working and optimal regions for the co-combustion of H-2 and CH4 under various conditions.
Article
Chemistry, Physical
Anish Tiwari, Shivani Agarwal, Kriti Shrivastava, Takayuki Ichikawa, Ankur Jain, Rini Singh
Summary: The KSiH3 system has superior hydrogen storage properties, making it a potential material for practical hydrogen storage. However, the activation barrier of the reaction restricts its reversible absorption and desorption of hydrogen at elevated temperatures. Catalysts can be used to enhance its kinetic properties, and in this work, Zr-based catalysts were used to reduce the activation energy.
Article
Chemistry, Physical
Hiroyuki Gi, Yuki Kashiwara, Yuki Itoh, Khushbu Sharma, Norio Ogita, Hiroki Miyaoka, Tomofumi Ogawa, Marolop Simanullang, Laurent Prost, Takayuki Ichikawa
Summary: A systematic study was conducted on the cryogenic H2 adsorption properties below the critical point of H2 on various adsorbents, comparing the density of adsorbed H2 and its temperature dependence with liquid H2. While most studies focus on new porous materials for H2 storage, this study investigated the density of adsorbed H2 below the critical point for metal-organic frameworks, super-activated carbon, and graphene nanoplatelets. It was found that the adsorption of superdense H2 in a monolayer state had a much higher density than liquid H2.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Electrical & Electronic
Jyoti Yadav, M. D. Anoop, Nisha Yadav, N. Srinivasa Rao, Fouran Singh, Takayuki Ichikawa, Ankur Jain, Kamlendra Awasthi, Rini Singh, Manoj Kumar
Summary: The effects of Ni7+ ion irradiation on Bi2Te3 thin films synthesized by e-beam evaporation were investigated. The films exhibited a polycrystalline rhombohedral structure. Irradiation caused a decrease in crystallite size and an increase in lattice strain. Raman spectra showed changes in A(1u)(1) modes with ion fluence. Surface roughness decreased due to the formation of nanocrystallites. XPS analysis confirmed the near stoichiometric composition of the films. The resistivity increased with ion fluence, resulting in a crossover behavior from n to p-type carriers. Compensation of bulk charge carriers was observed in the ion-irradiated films by adjusting the Fermi level.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Koki Tsunematsu, Keita Shinzato, Hiroyuki Gi, Kentaro Tagawa, Masakuni Yamaguchi, Hitoshi Saima, Hiroki Miyaoka, Takayuki Ichikawa
Summary: In this study, the catalytic performance of sodium alloys for ammonia production was systematically investigated. The results showed that ammonia could be synthesized at lower temperatures using sodium alloy catalysts under atmospheric pressure, with stable catalytic activity. The thermal stability and metallic feature of sodium atoms in the alloys were found to be related to the ammonia synthesis temperature and catalytic performance.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Masakuni Yamaguchi, Tomoyuki Ichikawa, Yoshitsugu Kojima, Hiroki Miyaoka
Summary: In this study, the equilibrium pressure of zirconium phosphate during ammonia ab/desorption was measured using cavity ring-down spectroscopy (CRDS). Two-step equilibrium plateau pressure was observed during the ammonia desorption. Hysteresis in zirconium phosphate at different equilibrium pressures during ammonia desorption and absorption was also observed.
Article
Chemistry, Physical
Pankaj Kumar Singh, Keita Shinzato, Hiroyuki Gi, Takayuki Ichikawa, Hiroki Miyaoka
Summary: This study systematically investigates the catalytic properties of group 4-6 element oxides, including TiO2, ZrO2, HfO2, V2O5, Ta2O5, CrO3, MoO3, and WO3, on magnesium hydride (MgH2). The dispersion of each oxide on the MgH2 surface is achieved through ball-milling. The hydrogen desorption properties are analyzed, and the oxides on MgH2 are characterized structurally and spectroscopically. Among the oxides, TiO2, V2O5, ZrO2, and CrO3 exhibit higher catalytic activity, enabling hydrogen desorption at around 200°C. The dispersion of the oxides on Mg is found to be closely related to the catalytic process, except for MoO3. Multi oxide states, particularly the 2+ and 3+ oxidation states of transition metals, contribute to the high catalytic activity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Yingtong Lv, Xiang Zhang, Wei Chen, Shunlong Ju, Zhenhua Liu, Guanglin Xia, Takayuki Ichikawa, Tengfei Zhang, Xuebin Yu
Summary: Nano-crystallization of MgH2 as an anode in all-solid-state lithium-ion batteries (ASSLIBs) using LiBH4 as a solid-state electrolyte is applied to improve cycling stability. The self-assembly designed MgH2 electrode on graphene effectively alleviates volume expansion, prevents agglomeration of active substances, improves electron transfer, and enhances electrochemical performance. The study demonstrates reversible capacity of 1214 mAh g-1 after 50 cycles and significantly enhanced cycle life with a capacity of 597 mAh g-1 after 200 cycles at a current density of 400 mA g-1. Full cell investigation also shows great application potential for ASSLIBs.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Masakuni Yamaguchi, Yoshitsugu Kojima, Hiroki Miyaoka
Summary: This study investigates the regeneration process of ammonia-absorbed zirconium phosphate and finds that it can be regenerated at 473K by reabsorbing ammonia and water, allowing for repeated use.
Proceedings Paper
Materials Science, Multidisciplinary
Nisha Yadav, M. D. Anoop, Jyoti Yadav, Rini Singh, Nabarun Bera, Ankur Jain, Takayuki Ichikawa, Kamlendra Awasthi, Manoj Kumar
Summary: This study presents the effective single crystal growth of (BiSb)2-xDyxTe3 and investigates its structural, morphological, electrical, and Hall properties. The results demonstrate that the lattice parameters decrease, the resistivity increases, and the Fermi level shifts with Dy doping.
MATERIALS TODAY-PROCEEDINGS
(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)
