Article
Chemistry, Physical
Dongyu Lai, Zhonghua Yao, Wei You, Biao Gao, Qinghu Guo, Ping Lu, Amjad Ullah, Hua Hao, Minghe Cao, Hanxing Liu
Summary: Recently, NaNbO3-based ceramics with excellent energy storage performances and fast charge discharge characteristics have been studied. BaTiO3 modified 0.85NaNbO3-0.15Bi(Zn2/3Nb1/3)O3 ceramics were successfully fabricated using solid state synthesis. Compared to pure 0.85NN-0.15BZN ceramics, the modified ceramics exhibit higher discharge storage density and excellent temperature stability, broadening the scope of NaNbO3-based ceramics for energy storage applications.
JOURNAL OF MATERIOMICS
(2022)
Article
Chemistry, Physical
Zhihui Yi, Zhuo Wang, Dan Wu, Ying Xue
Summary: This study proposes a polyvinylidene fluoride (PVDF)-based nanocomposite filled with multi-layer core-shell structured inorganic BaTiO3@BaxSr1-xTiO3@DA nanoparticles (BT@BST@DA NPs) to significantly enhance energy storage density. The optimized composite material exhibits high discharge energy density and excellent discharge efficiency.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Materials Science, Ceramics
Sonu Sarraf, Satyendra Singh
Summary: In this study, the effect of Li doping on the properties of lead-free Ba1-xLixTiO3 ceramics was systematically investigated. The results showed that Li substitution slightly shifted the phase transition temperature and significantly reduced the leakage current. The maximum values of the electrocaloric effect and energy storage density were achieved at x = 0.04 and x = 0.05, respectively. The lead-free Ba1-xLixTiO3 ceramic material has great potential for applications in solid-state refrigeration technology and high-efficiency energy storage devices.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Di Wang, Bingkai Chu, Peng Li, Weifang Han, Yuxia Kong, Peng Fu, Yuchao Li, Jigong Hao, Wei Li
Summary: In this study, high performance energy storage ceramics with large energy storage density and high energy efficiency were designed and synthesized. The modified samples showed good charge-discharge performance and exhibited good thermal and frequency stability. These materials have potential applications in pulse power systems.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Environmental
Wenrong Xiao, Zhen Liu, Chao Zhang, Zhanming Dou, Baoyan Fan, Meng Shen, Ying Yang, Wei Luo, Kanghua Li, Qiuyun Fu, Shenglin Jiang, Yaojin Wang, Guangzu Zhang
Summary: Ferroelectrics with high electric polarization are crucial for dielectric energy storage capacitors, but it is challenging to balance energy density with other important properties. In this study, we used domain engineering to compress the domains of materials into polar nano regions, reducing dielectric loss and maintaining high energy density. By incorporating BZZ into the BN system, we achieved a slim hysteresis loop, an energy efficiency of 91.4%, and an energy storage density of 10.2 J cm-3, exceeding the efficiency requirement of 90% for lead-free ferroelectric ceramics.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Materials Science, Multidisciplinary
Li-Min Wang, Qing-Xiang Liu, Di Zhou
Summary: A series of (1-x)BaTiO3-xBi(Li1/3Hf2/3)O-3 ceramics were prepared and characterized, with the 0.88BaTiO3-0.12Bi(Li1/3Hf2/3)O-3 composition showing the highest energy densities and efficiency.
Article
Materials Science, Ceramics
Yaoyi Qin, Feng Luo, Xile Geng, Junhao Xing, Fei Shang, Guohua Chen
Summary: Glass-ceramic dielectric materials with lead-free niobate were synthesized and their properties were studied. The results showed that at the optimum crystallization temperature, the glass-ceramics exhibited high discharge energy density, power density, dielectric constant, and low dielectric loss.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Ziqi Yang, Bing Wang, Yizhe Li, David A. Hall
Summary: Niobium doping can improve the microstructure and dielectric properties of BF-BT ceramics, making the material suitable for energy storage capacitors and temperature-stable dielectrics.
Article
Materials Science, Ceramics
Fei Shang, Juwen Wei, Yifa Deng, Guixiong Tang, Jiwen Xu, Di Zhou, Huarui Xu, Guohua Chen
Summary: In order to meet the requirements of miniaturization devices in high pulsed power technology, it is crucial to achieve high dielectric breakdown strength (DBS) and large energy storage density in dielectric materials. This study proposes a novel method to precipitate nanocrystals with cubic BaTiO3 phase from glass matrix, which can increase the dielectric constant and maintain high DBS compared to the parent glass. The BaTiO3 glass ceramic demonstrates a high recoverable energy storage density of -3.66 J cm-3 at 1000 kV cm-1 and a high discharge energy density of -3.57 J cm-3, with good thermal stability and an ultra-high peak power density of -910 MW cm-3, making it suitable for high pulsed power technology applications.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Zhihui Yi, Zhuo Wang, Yanxin Li, Dan Wu, Ying Xue, Jinteng Kang, Ting Zhao, Ronghui Ye
Summary: The development of portable electronic equipment, hybrid electric vehicles, and pulse power systems requires new dielectric materials with higher performance, making flexible polymer dielectrics desirable. In this study, Barium strontium titanate nanoparticles were successfully prepared using oxalate, and PVDF/BaxSr1-xTiO3 nanoparticles nanocomposites were synthesized. The micro-structure and electrical properties of the nanocomposites were analyzed to understand the effects of composition and intrinsic properties on their performance. Among all the groups, the 1 vol% PVDF/Ba0.6Sr0.4TiO3@DA NPs exhibited the highest discharge energy density and an excellent discharge energy efficiency of 65% at 300 kV/mm. This research provides experimental guidance and theoretical foundation for the development and application of high energy storage density dielectric materials in energy storage capacitors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Tongtong Fu, Jin Qian, Shufeng Xie, Changshuai Liu, Bo Shen, Jiwei Zhai
Summary: Glass-ceramics have great potential in sustainable development, environmental protection, high temperature, and high voltage resistance. Alkali-free niobate-based glass-ceramics have emerged as prominent energy storage materials. This study optimized the thickness and crystallization temperature of alkali-free glass-ceramics to improve breakdown strength and achieve maximum dielectric constant. An ultra-high theoretical energy storage density of 27.47 J/cm^3 was obtained. Finite element software simulated the electric field distribution and electric potential evolution, demonstrating the role of glass phase in hindering electric branch development. The effective energy storage density obtained through P-E loops was 1.49 J/cm^3 under 850 kV/cm.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Environmental
Yangfei Gao, Xiaopei Zhu, Bian Yang, Peng Shi, Ruirui Kang, Ye Yuan, Qida Liu, Ming Wu, Jinghui Gao, Xiaojie Lou
Summary: A new type of lead-free ceramics with excellent energy storage performance was successfully prepared by controlling the grain size and doping of impurities, providing new possibilities for practical applications of ferroelectric ceramics in energy storage.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Xiqi Chen, Mingkun Wang, Zhongbin Pan, Huanhuan Li, Jinghao Zhao, Luomeng Tang, Jinjun Liu, Peng Li, Hongzhen Xie, Jiwei Zhai
Summary: In this study, (Sr0.7Bi0.2)(Mg1/3Ta2/3)O3 (SBMT) was added as a dopant into 0.75BaTiO3-0.25Na0.5Bi0.5TiO3 (BT-NBT) to form a solid solution, effectively improving the relaxation behavior and insulation performance of the ceramic. This led to an increase in breakdown strength (Eb), reduction in hysteresis loss, and a synergistic improvement in energy storage density (Wrec) and efficiency (eta). The best performing composition was found to be 0.80(BT-NBT)-0.20SBMT, exhibiting superior values compared to BaTiO3 and other BaTiO3-based ferroelectric ceramics.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Xuqing Zhang, Yongping Pu, Yating Ning, Bo Wang, Lei Zhang, Xian Zhang, Yangchao Shang, Zhemin Chen
Summary: This study demonstrates the possibility of achieving high energy storage density and efficiency in dielectric materials through appropriate preparation methods, and improving their breakdown strength and insulation performance. The introduction of Sm3+ and control of oxygen vacancy production effectively enhance the performance and stability of the material.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Nanoscience & Nanotechnology
Kaikai Chen, Hairui Bai, Fei Yan, Xia He, Changshuai Liu, Shufeng Xie, Bo Shen, Jiwei Zhai
Summary: Rare-earth doped NBBN-AS glass ceramics exhibit excellent energy storage properties, with a theoretical energy density of 22.48 J/cm(3) and a giant power density of 220 MW/cm(3), along with an ultrafast discharge speed of 11 ns. Numerical simulation reveals the intrinsic mechanism for increased breakdown strength due to rare-earth doping in this study.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Applied
Krishnamayee Bhoi, Smaranika Dash, Sita Dugu, Dhiren K. Pradhan, M. M. Rahaman, Narendra Babu Simhachalam, A. K. Singh, P. N. Vishwakarma, Ram S. Katiyar, Dillip K. Pradhan
Summary: The study investigates the phase transition and magneto-electric properties of a 70 wt. % PFN-30 wt. % CZFMO multiferroic composite, revealing the complex behavior of magneto-electric coupling mechanisms and phase transitions.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Crystallography
Neeraj Panwar, Kuldeep Singh, Komal Kanwar, Yugandhar Bitla, Surendra Kumar, Venkata Sreenivas Puli
Summary: Rare-earth chromites have been investigated for their potential as substitutes for gas-based refrigeration technology due to their magnetocaloric properties at low temperatures. This study focuses on the low-temperature magnetic and magnetocaloric properties of Gd0.5Er0.5Cr1-xMnxO3 rare-earth orthochromites. Increasing the concentration of Mn ions in the compounds leads to a decrease in the Neel transition temperature. The magnetization versus temperature behavior of certain compounds shows magnetization reversal at a applied magnetic field. The experimental results demonstrate higher magnetocaloric effect values compared to other materials in the liquid helium temperature range.
Article
Chemistry, Multidisciplinary
Ahmad Majed, Manish Kothakonda, Fei Wang, Eric N. Tseng, Kaitlyn Prenger, Xiaodong Zhang, Per O. A. Persson, Jiang Wei, Jianwei Sun, Michael Naguib
Summary: A new family of 2D transition metal carbo-chalcogenides (TMCCs) has been reported. Single sheets were obtained from multilayered Nb2S2C and Ta2S2C. Nb2S2C exhibited superconductivity and delaminated Nb2S2C performed better as an electrode material for Li-ion batteries.
ADVANCED MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Y. D. Guan, C. H. Yan, S. H. Lee, X. Gui, W. Ning, J. L. Ning, Y. L. Zhu, M. Kothakonda, C. Q. Xu, X. L. Ke, J. W. Sun, W. W. Xie, S. L. Yang, Z. Q. Mao
Summary: Tuning the growth conditions and Sb concentration allowed us to obtain a ferromagnetic phase with a chiral crystal structure in Mn (Bi1-xSbx)(4)Te-7, showing the preservation of nontrivial band topology in the doped samples. Additionally, observation of magnetic glassy behavior in the samples suggests the presence of cluster spin-glass phases coexisting with long-range antiferromagnetic/FM orders, while discussions on the impact of antisite Mn ions and stabilized FM interlayer coupling were also made.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Vadla Veenachary, Venkata Sreenivas Puli, S. Narendra Babu, G. Prasad, N. Prasad
Summary: Aurivillius intergrowth multiferroic phases have attracted the interest of researchers due to their scientific and technological applications. In this study, the synthesis and characterization of the intergrowth compound Bi3.25La0.75Ti3O12 (BLT) and Bi4NdTi3Fe0.7Co0.3O15 (BNTF) were conducted. The results showed a signature of intergrowth formation, non-uniform grain morphology, and preferential hopping mechanism. The compound also exhibited weak ferromagnetic order and a high ME coefficient, making it potentially useful for room temperature magnetoelectric sensors.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Review
Materials Science, Multidisciplinary
Ampattu R. Jayakrishnan, Anuj Kumar, Sahana Druvakumar, Rosmin John, Meera Sudeesh, Venkata Sreenivas Puli, Jose P. B. Silva, Maria J. M. Gomes, Koppole C. Sekhar
Summary: Scientific research has shown that ferroelectric materials, particularly inorganic ferroelectric materials, play a crucial role in flexible energy devices. These devices, including energy harvesters, infrared sensors, and energy storage capacitors, focus on self-powered flexible sensors and energy harvesters to promote sustainability. By combining inorganic ferroelectric materials with organic/inorganic polymers, flexible devices can meet the requirements of high mechanical strength, piezoelectric and pyroelectric coefficients, and energy storage properties essential for harvesting, sensing, and storage applications. This review article provides a systematic analysis of flexible inorganic ferroelectric-based energy materials, discussing the importance of inorganic ferroelectrics and their current state-of-the-art in energy harvesting, IR sensing, and energy storage. It also explores the challenges and future prospects of developing high-quality flexible inorganic ferroelectric devices for real-world applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Materials Science, Coatings & Films
Margaret M. M. Brown, Ricardo Ruvalcaba, Katherine M. M. Burzynski, Derek Winner, Krishnamurthy Mahalingam, Venkata S. S. Puli, Ryan P. P. Laing, Tobin C. C. Muratore, Jeff L. L. Brown, Kurt G. G. Eyink, Said Elhamri, Aldo H. H. Romero, Jonathan Guerrero-Sanchez, Joseph P. P. Corbett, Amber Reed
Summary: This study investigates the nucleation, nano-platelet growth, and optical properties of the topological semimetal superlattice Bi-2-Bi2Se3 under quantum confinement. The effects of thickness and Ar+ ion pressure in sputtered growths are analyzed. Density functional theory is used to study the quantum confinement and band structure evolution. The observed optical properties are in agreement with the theoretical predictions. The study also reveals the growth mode of nano-platelets and the ordering statistics of nucleation.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Crystallography
Vadla Veenachary, Eskilla Venkata Ramana, Simhachalam Narendra Babu, Venkata Sreenivas Puli, Adiraj Srinivas, Gopalan Srinivasan, Sujoy Saha, Guduru Prasad, Nandiraju Venkata Prasad
Summary: In this study, intergrowth of multiferroic compounds Bi4RTi3Fe0.7Co0.3O15-Bi3RTi2Fe0.7Co0.3O12-delta (BRTFCO15-BRTFCO12) (rare earth (R) = Dy, Sm, La) were prepared using solid-state reaction method. The X-ray diffraction Rietveld refinement revealed orthorhombic structure with three-layered and four-layered compounds. Magnetic measurements showed that the Sm-modified intergrowth compound had a larger magnetization compared to Dy- and La-doped ones. The higher magnetization can be attributed to distortion in the unit cell, bonding of Fe3+-O-Co3+, and possible mixture of FexCoy-type nanoparticles formed during synthesis of intergrowths. The results demonstrate that the RE-modified intergrowth method is an effective approach for preparing higher-layer Aurivillius multiferroic ceramics.
Article
Chemistry, Multidisciplinary
Claudia C. Zuluaga-Gomez, Christian O. Plaza-Rivera, Balram Tripathi, Rajesh K. Katiyar, Dhiren K. Pradhan, Gerardo Morell, Yi Lin, Margarita Correa, Ram S. Katiyar
Summary: A composite cathode material of sulfur/ferroelectric nanoparticles/holey graphene (S/FNPs/hG) was fabricated to address the limitations of capacity fading in high-mass-loading Li-S batteries. The unique structure of holey graphene enables fast electron and ion transport within the electrode while mitigating volume expansion. Additionally, the ferroelectric polarization induced by FNPs effectively reduces the shuttling effect. The S/FNPs/hG composite cathodes exhibit sustainable high specific capacity, reliable cycle performance, and superior rate capability for potential commercial applications.
Review
Energy & Fuels
Venkata Sreenivas Puli, A. R. Jayakrishnan, Dhiren Kumar Pradhan, Kalpana Madgula, S. Narendra Babu, Douglas B. Chrisey, Ram S. Katiyar, Amber Reed, Michael McConney, Tyson Back, Renee M. Van Ginhoven, Susan Heidger
Summary: With the rapid development of the electronics industry, there is a growing need for dielectric capacitors with higher energy-storage capability for pulsed power electronic devices. However, current dielectric materials face significant challenges in meeting the desired device performance due to their limitations in dielectric permittivity, breakdown strength, and hysteresis loss. Therefore, it is important to thoroughly understand the implementation, optimization, and limitations of ferroelectric, relaxor-ferroelectric, and anti-ferroelectric thin films in high-energy storage dielectric capacitors for future applications.
Article
Chemistry, Physical
Manish Kothakonda, Aaron D. Kaplan, Eric B. Isaacs, Christopher J. Bartel, James W. Furness, Jinliang Ning, Chris Wolverton, John P. Perdew, Jianwei Sun
Summary: A central aim of materials discovery is to accurately describe thermodynamic properties. This study evaluates the accuracy of the r(2)SCAN method in describing solid-state thermodynamics and compares it with other methods. The results show that r(2)SCAN achieves comparable accuracy to SCAN and often improves upon it. The average absolute errors in predicted formation enthalpies decrease by a factor of 1.5 to 2.5 from the GGA level to the meta-GGA level.
Article
Materials Science, Multidisciplinary
Jinliang Ning, Manish Kothakonda, James W. Furness, Aaron D. Kaplan, Sebastian Ehlert, Jan Gerit Brandenburg, John P. Perdew, Jianwei Sun
Summary: This article introduces an optimized van der Waals density functional, r(2)SCAN + rVV10, and tests its performance in molecular interactions and layered materials. Experimental results demonstrate that r2SCAN + rVV10 outperforms its predecessor in terms of efficiency and accuracy.
Article
Energy & Fuels
Venkata Sreenivas Puli, Dhiren K. Pradhan, Kalpana Madgula, S. Narendra Babu, Meena Laad, Douglas B. Chrisey, Ram S. Katiyar, Amber Reed, Tyson Back, Michael E. Mc Conney, Renee M. Van Ginhoven, Susan Heidger
Summary: In this study, epitaxial (Ba0.955Ca0.045)(Zr0.17Ti0.83)O-3 [BCZT] thin films were grown on MgO single crystal substrates coated with La0.67Sr0.33MnO3 (LSMO) using pulsed laser deposition (PLD). The crystal structure, ferroelectric, piezoresponse force microscopy (PFM), and energy storage properties of the BCZT films were investigated. The results showed that the BCZT films had good epitaxial growth, perovskite crystal structure, and high saturation polarization and remanent polarization, making them suitable for capacitor applications.
Article
Materials Science, Multidisciplinary
Shalini Kumari, Dhiren K. Pradhan, Shi Liu, M. M. Rahaman, Peng Zhou, Kevin M. Roccapriore, Dillip K. Pradhan, Gopalan Srinivasan, Qi Li, Ram S. Katiyar, Philip D. Rack, J. F. Scott, Ashok Kumar
Summary: The study focuses on the investigation of multiferroic and ME properties of Ni-doped PZT materials, showing strong ME coupling. Although X-ray diffraction indicates a single-phase material, transmission electron microscopy reveals regions with and without Ni, suggesting the possibility of magnetoelectric coupling between two phases.
Article
Materials Science, Multidisciplinary
Dhiren K. Pradhan, Hari Sankar Mohanty, Shalini Kumari, Krishnamayee Bhoi, Nan Tang, Ravikant, M. M. Rahaman, Dillip K. Pradhan, Ashok Kumar, Dustin A. Gilbert, Philip D. Rack
Summary: This study investigated the structural, electronic, magnetic, and magnetoelectric coupling of BaTiO3 ceramics doped with 3.5, 5, and 7.5% cobalt. The findings suggest that increasing cobalt content decreases tetragonality ratio, lowers ferroelectric transition temperature, and alters electrical properties, leading to ferromagnetic ordering and significant magnetoelectric coupling in the 7.5% cobalt-doped samples.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
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)
