Article
Chemistry, Physical
Hend Kacem, Ah Dhahri, Z. Sassi, L. Seveyrat, L. Lebrun, V Perrin, J. Dhahri
Summary: Ferroelectric materials, such as lead-free BaTi0.91Sn0.09O3 ceramic, are widely used in sensors, transducers, and health monitoring systems due to their multi-physical coupling ability for energy harvesting applications. The structural information of the sample was determined using X-ray diffraction data and Raman spectra, showing ferroelectric behavior in relaxation. The sample exhibited a recovered energy density of 48.18 mJ/cm(3) and an energy efficiency of 41%, making it suitable for energy conversion applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Rajib Mondal, Md Al Mahadi Hasan, Jeong Min Baik, Ya Yang
Summary: Heat energy, which is available in large quantities and often wasted, can be harnessed and converted into electrical energy for use in ultra-low power devices. Pyroelectric energy harvesting technology has gained significant attention in power generation and sensing systems due to its ability to scavenge thermal energy. Various pyroelectric and piezoelectric materials have been explored for their potential in energy harvesting and sensing applications. This review provides a comprehensive summary of the significance and physical applications of pyroelectric materials, including single crystal, inorganic films, ceramics, organic materials, polymers, and composites, for thermal energy harvesting in sensor devices. The potential for next-generation self-powered sensor technologies is also discussed.
Article
Materials Science, Multidisciplinary
Mehak Aggarwal, Arun Kumar Singh, Shobhna Dhiman, Gyaneshwar Sharma, O. P. Thakur, Sanjeev Kumar
Summary: This article highlights the microstructural tuning approach in ferroelectric BSZT ceramics to enhance the figure of merits (FOMs) associated with pyroelectric energy conversion. By introducing porosity using the burning out of polymer sphere technique, a significant improvement in pyroelectric properties was observed compared to dense ceramics. This microstructural engineering opens up a promising route for achieving high piezoelectric and pyroelectric figure of merits.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Pierre Lheritier, Alvar Torello, Tomoyasu Usui, Youri Nouchokgwe, Ashwath Aravindhan, Junning Li, Uros Prah, Veronika Kovacova, Olivier Bouton, Sakyo Hirose, Emmanuel Defay
Summary: A new type of macroscopic thermal energy harvester has been proposed, which can convert heat into electricity, making significant contributions to sustainable energy. This harvester has high efficiency and high electric energy density, capable of sustainably powering microcontrollers and sensors.
Article
Energy & Fuels
Chengbin Yu, Young Seok Song
Summary: 3D porous graphene aerogel has the ability to infiltrate a large amount of phase-change materials into its internal pores. By introducing cysteamine to bind the graphene aerogel, the volume shrinkage problem during infiltration can be reduced and the composite exhibits excellent form stability. The composite can generate electrical energy when connected to a pyroelectric electrode. The finite-element method is used to confirm the experimental results by estimating the temperature profile and electrical peaks.
Article
Materials Science, Multidisciplinary
Jun Zhang, Lijing Peng, Xiaoyang Wang, Dongling Liu, Nan Wang
Summary: Controlling the Zr/(Zr+Ti) molar ratio affected the phase composition, growth orientation, and hardness of TixZr1-xN films. According to the analysis results from the Chinese and English data, two hardness peak values were observed at Zr/Ti molar ratios of 40:60 and 60:40 respectively.
Article
Physics, Applied
Goki Kimura, Sang-Hyo Kweon, Kiyotaka Tanaka, Yukio Sato, Isaku Kanno
Summary: Artificial superlattice thin films of PZT were grown on silicon substrates, and the influence of strain on their piezoelectric properties was studied. Different PZT layers with a 4nm period were observed. The ferroelectric properties varied depending on the composition, and the strain between layers controlled the piezoelectric properties.
APPLIED PHYSICS LETTERS
(2023)
Article
Energy & Fuels
Joshua D. Wilbur, Chris Dames
Summary: Traditional pyroelectric energy conversion research has focused on improving energy output per cycle, but this study analyzes power output optimization for pyroelectric energy harvesting systems. The study highlights the importance of the average temperature amplitude of the pyroelectric material compared to the available thermal resource. By considering different types of thermal energy sources, figures of merit are identified to improve power harvesting performance within different frequency regimes.
Article
Chemistry, Physical
Liangwei Hu, Guanghui Zhang, Yangyang Zhang, Wenfei Zhang, Husheng Wang, Kun Liu, Yifei Zhang, Qifan Li, Yong Chen, Meng Shen
Summary: In this study, (1-x)Bi0.5Na0.5TiO3-xBaNi0.5Nb0.5O3 (BNT-xBNN, x = 0, 0.02, 0.03, 0.04 mol) lead-free ceramics were prepared, and the addition of BaNi0.5Nb0.5O3 improved the lattice cell expansion and decreased the O-B-O bond angles, resulting in micron-sized grains (3.25-6.15 mu m) with good ferroelectric performance (Pr = 42 mu C/cm2, Ps = 47 mu C/cm2). The permittivity (epsilon r) of pristine samples increased from 439 to 723 as the BNN content increased to 0.03 mol. As a result, an enhanced room temperature pyroelectric coefficient of 7.91 x 10-4 C m-2 K-1 with a high depolarization temperature of about 150 degrees C was achieved in BNT-xBNN with x = 0.03 mol, which correspondingly generated an energy density of 22.3 mu J/cm3 with a 90 M omega load. This work contributes to the development of practical applications in pyroelectric properties for energy harvesting.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Yongqiang Tan, Wei Liao, Zhen Teng, Haibin Zhang
Summary: Two types of high-entropy carbides were compared and it was found that the introduction of carbon vacancy can lower the sintering temperature, unaffected the Vickers hardness, but significantly decrease the strength. The nonstoichiometric high-entropy carbide showed a 50% decrease in thermal conductivity, primarily due to the lower electrical conductivity. The oxidation resistance in high temperature water vapor was not sensitive to carbon stoichiometry.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Energy & Fuels
Han Seung Choi, Sunghoon Hur, Ajeet Kumar, Hyunseok Song, Jeong Min Baik, Hyun-Cheol Song, Jungho Ryu
Summary: A novel thermo-magneto-pyroelectric energy generator (TMPyEG) was developed to continuously harvest waste heat and convert it into electric energy without the need for complicated electric bias fields. By utilizing second-order magnetic phase transition, displacement reciprocation was achieved without intervention, and the energy gaps between pyroelectric energy outputs were mitigated by incorporating piezoelectric material. Notably, the generated energy from pyroelectric conversion in TMPyEG outperformed that of thermoelectric generators under similar thermal conditions.
Article
Materials Science, Ceramics
Xianghui Chen, Yan Xue, Bo Zhang, Pengjun Zhao, Yuyu Liu, Xuelian Bai, Bing Wu, Ye Pan, Huimin Zhang, Aimin Chang, Yongxin Xie
Summary: A series of new negative temperature coefficient (NTC) thermal materials based on (Ba0.85Ca0.15)(1-x)Ce-x/2(Zr0.1Ti0.9)O-3 ceramics were synthesized and their crystal structure, morphology, composition and performance characteristics were investigated. It was found that the average grain size of doped ceramic samples experienced a decrease-then-increase trend, and the doping of Ce reduced the sintering temperature. The thermal constant and activation energy initially increased and then decreased with increasing doping amount, and the concentration of oxygen vacancies was influenced by the transition of Ce ions. The (Ba0.85Ca0.15)(1-x)Ce-x/2(Zr0.1Ti0.9)O-3 ceramics exhibited excellent negative temperature characteristics at high temperatures and showed improved temperature resistance linearity after aging.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Vijay Bijalwan, Jiri Erhart, Zdenek Spotz, Dinara Sobola, Vladimir Prajzler, Pavel Tofel, Karel Maca
Summary: This comprehensive study investigated the energy harvesting characteristics and electro-mechanical properties of lead-free (BaZr0.2Ti0.8)O-3-x(Ba0.7Ca0.3Ti)O(3) ceramics, with the 5/5 BZT/BCT composition showing the best performance. The study found that the R-O-T phase boundary region contributed to the outstanding energy conversion efficiency and large mechanical quality factor of the ceramics. These materials show great potential for applications in sensors, actuators, resonators, and energy harvesting.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Chenying Shi, Muzhi Ma, Biaobiao Yang, Yuling Liu, Yushen Huang, Yong Du
Summary: In this study, the effect of Ti content on the microstructure, mechanical, and electrical properties of Cu-Cr-Zr alloys was investigated. The electrical conductivity decreased with increasing Ti content due to electron scattering. The higher hardness/strength was attributed to higher dislocation density and finer FCC-Cr precipitates. Thermodynamic and kinetic calculations showed that increasing Ti content facilitated the nucleation of FCC-Cr but hindered its growth process.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Thermodynamics
Ali Mohammadnia, Alireza Rezania
Summary: This study investigates the performance of a pyroelectric energy harvester (PEH) used as a dielectric substrate in power electronic modules, and develops a comprehensive analytical model in MATLAB software to validate the theoretical results with experimental data. The results show that the pyroelectric substrate can harvest an average power of 50 μW/cm2. It is also found that input heat rate frequency higher than 2 Hz has no significant impact on power generation by the pyroelectric module, and convective cooling density with low heat transfer coefficients can increase power generation.
ENERGY CONVERSION AND MANAGEMENT
(2023)
Article
Engineering, Electrical & Electronic
Hao Pan, Dashi Lu, Lihua Zhu, Mingyu Li, Hongjun Ji
Summary: Thermal behavior and phase ratios optimization of Sn/Cu composite solders were studied. The results showed that increased solid-liquid contact area promoted the formation of IMC, resulting in decreased melting endothermic peak temperature of Sn and its enthalpy change. The in situ temperature rose with higher solid-liquid contact area during ultrasonic-assisted transient liquid phase. The phase ratio of residual Cu and Cu3Sn increased with decreasing solid-liquid contact area after U-TLP, while it increased with more initial Cu content.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Bo Wang, Mingyu Li, Yuxuan Liu, Xinyi Liang, Yang Yang, Xinzheng Lan, Liang Gao, Jianbing Zhang, Jiang Tang
Summary: Researchers have developed a new and simple synthesis method for highly monodisperse and halide passivated PbS quantum dots. This method improves the quality of quantum dots and enhances their optoelectronic properties.
Article
Engineering, Electrical & Electronic
Chunyu Hu, Rongxing Yang, Weimin Shi, Li Li, Ruibin Gao, Zhijiang Dai, Jingzhou Pang, Mingyu Li
Summary: This paper presents a complex combining method for designing wideband Outphasing power amplifiers (OPAs). The method uses complex combining impedance to compensate for the frequency dispersion of the active load modulation in the OPA, extending its bandwidth. It is illustrated for the first time that the load modulation trajectories of the OPA can be corrected over a wide bandwidth by designing the complex combining impedance.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2023)
Article
Engineering, Electrical & Electronic
Yao Yao, Weimin Shi, Jingzhou Pang, Zhijiang Dai, Mingyu Li
Summary: This paper develops a simple dual-input dual-output (DIDO) Doherty power amplifier (DPA) that achieves flexible power transferring and enhanced efficiency by dynamically controlling the input amplitudes and phase difference of two sub-amplifiers. The fabricated DIDO-DPA operates at 2.4 GHz and delivers an output power of over 43.3 dBm, with a maximum drain efficiency (DE) of over 69.5% and a 6-dB back-off DE of over 58% at each output port.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Engineering, Electrical & Electronic
Wenyi Jia, Zefan Feng, Tianfu Cai, Mingyu Li, Weimin Shi, Zhijiang Dai
Summary: In this paper, a robust constrained filtering algorithm called recursive constrained least arctangent (RCLA) adaptive algorithm is proposed. By introducing a novel cost function framework, the proposed RCLA algorithm shows superior convergence performance and better steady-state behavior against impulsive noises compared to other existing recursive methods. The mean square convergence analysis and theoretical transient mean square deviation (MSD) are derived in detail. Computer simulations are conducted to validate the theoretical analysis and verify the superior behavior of the proposed RCLA algorithm compared to known algorithms under non-Gaussian environments.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Engineering, Electrical & Electronic
Jinting Liu, Weimin Shi, Linping Feng, Mingyu Li
Summary: This paper introduces the use of a dual-input technique to improve the conversion efficiency of a broadband Doherty power amplifier (DPA). By dynamically controlling the input power levels and phase difference between the carrier and peaking power amplifiers (PAs), the efficiency between the two peaks in the DPA is enhanced. Experimental results demonstrate the effectiveness of the fabricated dual-input DPA (DI-DPA) operating over the 1.1-2.2 GHz frequency range.
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Yixuan Lin, Xiaoquan Qi, Guoqiang Niu, Qin Sun, Hongjun Ji, Mingyu Li, Yufeng Li
Summary: This study demonstrates the successful surface metallization of Si3N4 ceramic substrate using the thick film method. High-performance silver thick films were formed on the Si3N4 surface, with significantly improved mechanical and electrical properties at higher sintering temperatures. The bonding between the thick film and the substrate was enhanced through interfacial reaction, resulting in the formation of the Bi2Si2O5 phase. This study has great significance for future research on interfacial design.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Computer Science, Information Systems
Mingyu Li, Xiaobing Cheng, Zhijiang Dai, Kang Zhong, Tianfu Cai, Chaoyi Huang
Summary: A novel method to extend the output power back-off (OPBO) range of the Doherty power amplifier (DPA) is proposed. The OPBO range of the DPA can be extended by tuning the output impedance of the peaking stage and changing the phase delay of the output matching network. A large OPBO range high-efficiency asymmetrical DPA is designed and tested within a working band of 1.55 to 2.2 GHz (35% relative bandwidth) to validate the proposed method. The experimental results show that the DPA operates from 1.6 to 2.1 GHz with an OPBO range of 11.1-13.2 dB and efficiency range of 42.2%-52.1% in the OPBO state and 47%-62.7% in the saturation state.
FRONTIERS OF INFORMATION TECHNOLOGY & ELECTRONIC ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Sisi Liu, Meng Wang, Xiong Yu, Hao Li, Haifei Lu, Xiaoyan Wen, Ming-Yu Li, Jianbing Zhang
Summary: A hybrid electron transport layer (ETL) consisting of titanium-based nanomaterials and sol-gel zinc oxide (ZnO) is developed to enhance the infrared power conversion efficiency (PCE) of lead selenide (PbSe) quantum dot solar cells.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yanran Wang, Ming-yu Li, Shijie Liu, Yuan Ma, Bo Sun, Liangyu Wang, Haifei Lu, Xiaoyan Wen, Sisi Liu, Xumin Ding
Summary: Perovskite quantum dot/nanoplate heterostructures show great potential in underwater optical wireless communication systems, with improved photoluminescent efficiency and stability.
Article
Engineering, Electrical & Electronic
Zhijiang Dai, Shuman Kong, Mingyu Li, Tianfu Cai, Yi Jin, Changzhi Xu
Summary: A low-complexity Digital PreDistortion (DPD) method based on Improved Sparse Least Squares Twin Support Vector Regression (ISLSTSVR) modeling theory is proposed in this paper to tackle the resource consumption issue caused by the nonlinearity of the power amplifier in the RF front-end of high-capacity satellite communication. Experimental results show that this method can significantly reduce the coefficients and computational complexity of the DPD model while maintaining its accuracy, providing an effective idea and method for coefficient dimension reduction in the predistortion technology of spaceborne RF front-ends.
JOURNAL OF ELECTRONICS & INFORMATION TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Weiheng Jiang, Yaoxing Duan, Mingyu Li, Yi Jin, Changzhi Xu, Li Li
Summary: In traditional Digital PreDistortion (DPD) models, the same set of polynomial models and memory model are used to linearize the Power Amplifier (PA) at all input signal powers. However, different power levels exhibit different nonlinear characteristics and memory effects in PAs. To solve this problem, a DPD model based on the blind K-Nearest Neighbor (KNN) algorithm with dimension weighting is proposed. The proposed method is experimentally verified using a Doherty PA and a three carrier Long Term Evolution (LTE) signal.
JOURNAL OF ELECTRONICS & INFORMATION TECHNOLOGY
(2023)
Article
Computer Science, Information Systems
Guangwen Yang, Xinpeng Li, Jinting Liu, Xiaojuan Han, Hong Chang, Wei Zhang, Xinquan Yang, Mingyu Li
Summary: In this paper, the analysis and design method for the suboptimum Class-EM/F3 inverter with a duty ratio D =0.5 are presented. By introducing the new design parameter K, the suboptimum degree and the distance from the optimum condition can be defined. The proposed inverter offers lower peak switching voltage and higher efficiency compared to the conventional Class-E-M inverter.
Article
Engineering, Electrical & Electronic
Zixiong Li, Mingyu Li, Xinyi Hou, Lei Du, Lin Xiao, Tianshu Wang, Wanzhuo Ma
Summary: This paper proposes a mode-locked fiber laser based on graphene-coated microfiber. The total length of the fiber laser resonant cavity is 31.34 m. Dual-wavelength tuning is realized by adjusting the polarization controller (PC), and the wavelength tuning range is 11 nm. The effects of polarization states on bright-dark solitons are studied, and it is demonstrated that the mode-locking state can be switched between conventional solitons and bright-dark solitons in the graphene mode-locked fiber laser. Bright-dark soliton pairs with different shapes and nanosecond pulse width can be obtained by adjusting the PC and pump power.
FRONTIERS OF OPTOELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Chunyu Hu, Weimin Shi, Rongxing Yang, Shuaijiang Lin, Zhijiang Dai, Ruibin Gao, Chaoyi Huang, Jingzhou Pang, Mingyu Li
Summary: This letter presents the design and implementation of a broadband outphasing power amplifier (OPA) with complex combining impedance. The complex combining impedance, achieved through a post-matching network (PMN), is used to compensate for the frequency dispersion in the OPA. The results show that the designed OPA achieves high performance in terms of saturation power, saturation drain efficiency, and back-off efficiency over a wide frequency range.
IEEE MICROWAVE AND WIRELESS TECHNOLOGY LETTERS
(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)
