Article
Polymer Science
Ruchita Jani, Niall Holmes, Roger West, Kevin Gaughan, Xiaoli Liu, Ming Qu, Esther Orisakwe, Lorenzo Stella, Jorge Kohanoff, Hongxi Yin, Bartlomiej Wojciechowski
Summary: Thermoelectric materials can convert thermal energy into electrical energy, and can be used to harvest the heat energy generated by temperature differences between the inside and outside of buildings. This paper presents research on the development and characterization of a cement-based thermoelectric material, which is doped with metal oxides to enhance its thermoelectric properties. The study also discusses the positive impact of moisture content on the electrical conductivity of the material.
Article
Materials Science, Multidisciplinary
Wenjie Tan, Jiarui Zhang, Fukun Ma, Min Jing, Ningning Xing
Summary: Ca2Si was synthesized using a high-temperature melting furnace and spark plasma sintering process for studying its thermoelectric properties. The use of high-temperature melting furnaces prevented Ca element volatilization during preparation, ensuring high-purity Ca2Si production. Ca2Si showed a gradual increase in resistivity with rising temperature, reaching 12 mO.cm at 873K, indicating semi-metallic characteristics. With relatively low thermal conductivity of 1.1 to 1.7 W.m(-1).K-1 in the temperature range of 323K-873K, Ca2Si achieved a maximum thermoelectric figure of merit (ZT) of 0.1 due to its atypical behavior and electrical properties of semiconductors. In contrast, Mg2Si attained a higher ZT value of 0.32 at 873K, primarily because of its exceptional Seebeck coefficient.
Article
Chemistry, Physical
Vikash Sharma, Divya Sharma, Ranu Bhatt, Pankaj K. Patro, Gunadhor Singh Okram
Summary: We report on the thermoelectric properties of nickel-doped Ag2-xNixTe nanostructures in a certain temperature range. The material undergoes a metal-insulator transition with increasing nickel doping concentration. The electrical resistivity and Seebeck coefficient show linear relationships with temperature. The material achieves higher thermoelectric coefficient through a sharp decrease in thermal conductivity associated with a structural phase transition.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Yan Yan, Shuo Zhang, Qun Ma, Ziyang Wang, Tao Feng, Qi Chen, Bo Shi, Fangyuan Sun, Meng Liang, Junxi Wang, Xiaoyan Yi, Jinmin Li, Zhiqiang Liu
Summary: A new two-dimensional InGaN/GaN SL structured TE device was developed, which successfully improved the TE performance parameter by reducing the thermal conductivity without deteriorating the power factor. This research provides a new material system for improving the performance of nitride TE materials at high temperatures and extends the application fields of electricity harvesting from waste heat.
Article
Materials Science, Multidisciplinary
Wen-yu Fang, Xiao-Xiao Rao, Jun Cheng, Ping Xue, Xiao-fei Sheng, Chun-jing Liu, Peng-cheng Zhang
Summary: In this paper, the stability, elastic, electronic structures and thermoelectric properties of unexplored 2D materials, GeSb2Te4 and GeBi2Te4, were investigated. These materials exhibit high stability, acceptable cleavage energies, and narrow band gaps. The septuple layers of these materials possess anisotropic electron and hole mobilities, resulting in high conductivities and desirable thermoelectric power factors. Furthermore, their low lattice thermal conductivities contribute to their high thermoelectric figure of merit.
Review
Chemistry, Multidisciplinary
Yan Sun, Yue Liu, Ruichuan Li, Yanshuai Li, Shizheng Bai
Summary: This paper reviews the design and research progress of thermoelectric materials around lifting ZT value in recent years, discussing the optimization of carrier concentration, improvement of carrier mobility, and the influence of lattice thermal conductivity on thermoelectric performance. The synergistic effect of different dimensions, scales, and crystal structures to reduce lattice thermal conductivity is also discussed, as well as the new application of electro-acoustic decoupling in thermoelectric materials, providing practical ideas for expanding the application and scale industrialization of thermoelectric devices.
FRONTIERS IN CHEMISTRY
(2022)
Article
Chemistry, Physical
Jun Cheng, Xiao-Xiao Rao, Wen-Yu Fang, Xiao-Fei Sheng, Lei Bao
Summary: In this study, three unexplored 2D materials, ZnAl2S4, ZnGa2S4 and ZnIn2S4, were proposed and their stability, thermoelectric and photocatalytic water splitting performance were investigated. The results demonstrate that these materials possess high stability and excellent performance, providing potential solutions to energy and environmental issues.
Article
Chemistry, Physical
Dmitry Pshenay-Severin, Satya Narayan Guin, Petr Konstantinov, Sergey Novikov, Ekashmi Rathore, Kanishka Biswas, Alexander Burkov
Summary: This study presents the experimental and theoretical investigation of the band structure, phonon spectrum, and thermoelectric properties of jalpaite. The measurements reveal a low thermal conductivity value at room temperature, which is attributed to the complex crystal structure of the material. The influence of intrinsic defects on the transport properties has also been studied.
Article
Chemistry, Physical
Pradeep Kumar Sharma, T. D. Senguttuvan, V. K. Sharma, Pankaj Patro, Sujeet Chaudhary
Summary: In this study, the thermoelectric performance of PbTe compound was significantly improved through bismuth doping and dispersing SiC nanoparticles. Bismuth doping improved the electrical conductivity, while SiC nanoparticles regulated the Seebeck coefficient and suppressed the lattice thermal conductivity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Electrical & Electronic
Yu Liu, Andrey V. Kretinin, Xiaodong Liu, Weichen Xiao, David J. Lewis, Robert Freer
Summary: Cu12Sb4S13 thin films were deposited on various substrates via aerosol-assisted chemical vapor deposition (AACVD), and the addition of a Sb2O3 buffer layer improved the quality and electrical transport properties of the deposited thin film. The films grown on different substrates showed different microstructures and electrical transport properties, with the film deposited on a SiO2-coated Si wafer exhibiting the best performance.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Hyerin Jeong, Samuel Kimani Kihoi, Hyunji Kim, Ho Seong Lee
Summary: In this study, improved thermoelectric performance of GeTe-based materials was achieved through Bi and In co-doping, which tuned the carrier concentration, resonant states, and suppressed thermal conduction. The introduction of Bi induced resonant states near the Fermi energy level, while also significantly reducing lattice thermal conductivity by forming extensive solid solution point defects. Additionally, co-doping with Bi and In lowered the phase transformation temperature and widened the temperature range for better thermoelectric performance of cubic GeTe.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Physical
Sree Sourav Das, Md. Golam Rosul, Mona Zebarjadi
Summary: We propose a first-principles framework to study the electronic properties of SnSe2 and optimize its thermoelectric performance. By using density functional theory and the Boltzmann transport equation, we calculate the thermoelectric power factor considering electron-phonon and ionized impurity interactions. Furthermore, we evaluate the lattice thermal conductivity and find that the SnSe2 layers exhibit ultra-low thermal conductivity, resulting in a high ZT value of 1.1 at 950 K.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
D. Zhao, Q. Jiang, Y. Jia, J. Zhou, N. Zheng, D. Hu, Y. Ma
Summary: This study demonstrates the use of phenyl lithium doping to create a suspension mixed with unsubstituted NDI, which can be drop-cast to prepare dense films for TE applications. By optimizing the doping ratio, impressive electrical conductivity and Seebeck coefficient were achieved in the TE film.
MATERIALS TODAY ENERGY
(2021)
Article
Chemistry, Physical
Muath M. Al Malki, Xun Shi, Pengfei Qiu, G. Jeffrey Snyder, David C. Dunand
Summary: The n-type Skutterudite alloy Yb0.3Co4Sb12 exhibits plastic deformation and creep characteristics under compressive stress at 500 degrees C, showing a moderate creep resistance. The study results indicate that Yb0.3Co4Sb12 can withstand certain pressures and maintain ductility at 500 degrees C, but a decrease in electrical conductivity leads to a slight reduction in its thermoelectric performance.
JOURNAL OF MATERIOMICS
(2021)
Article
Chemistry, Multidisciplinary
Stephane Grauby, Aymen Ben Amor, Geraldine Hallais, Laetitia Vincent, Stefan Dilhaire
Summary: With a specially designed AFM set-up, the research team has developed and validated a prototype capable of detecting both thermal and electrical properties simultaneously. AFM approach allows imaging of nanostructures and extraction of physical properties, paving the way for quantitative estimation of the figure of merit of nanostructures.
Article
Chemistry, Physical
Chen Zhu, Jian Zhang, Hongwei Ming, Lulu Huang, Yuanyue Li, Tao Chen, Di Li, Baoli Zhang, Jingtao Xu, Xiaoying Qin
Summary: The study utilized Bi doping and Cu1.75Te nanophase to enhance the thermoelectric properties of PbTe materials, resulting in n-type PbTe materials with high ZT values at lower temperatures and maintaining high ZT values over a broad temperature range.
JOURNAL OF MATERIOMICS
(2021)
Article
Chemistry, Physical
Bushra Jabar, Xiaoying Qin, Adil Mansoor, Hongwei Ming, Lulu Huang, Mazhar Hussain Danish, Jian Zhang, Di Li, Chen Zhu, Hongxing Xin, Chunjun Song
Summary: Incorporation of nano-sized 3D topological insulator Bi2Se3 in n-type Bi2Te2.7Se0.3 alloy leads to improved electron mobility and electrical conductivity, as well as enhanced Seebeck coefficient due to energy dependent carrier scattering. Additionally, the inclusion of 3D-TI nanoinclusions results in enhanced phonon scattering, leading to a significant increase in power factor and decrease in total thermal conductivity of the material, ultimately increasing the figure of merit ZT.
Article
Chemistry, Physical
Tao Chen, Hongwei Ming, Baoli Zhang, Chen Zhu, Jian Zhang, Qi Zhou, Di Li, Hongxing Xin, Xiaoying Qin
Summary: The thermoelectric properties of CuSb1-xCdxSe2 compounds were studied, with Cd doping leading to a significant increase in the Seebeck coefficient and decrease in lattice thermal conductivity. The enhancement in thermopower is attributed to an increase in electronic density of states, while the decrease in thermal conductivity is due to enhanced phonon scattering by introduced impurity atoms. The substitution of Cd is shown to be a feasible way to improve the thermoelectric performance of the CuSbSe2-based system.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Chen Zhu, Hongwei Ming, Jian Zhang, Di Li, Tao Chen, Xiaoying Qin
Summary: The thermoelectric properties of dually substituted Cu12-xInxSb4S12.8Se0.2 tetrahedrites were investigated. The results showed that the dual substitution of In for Cu and Se for S not only enhanced the thermopower, but also significantly reduced the lattice thermal conductivity. By enhancing phonon scattering through point defects, an ultralow thermal conductivity was achieved, leading to a high figure of merit in the dually substituted sample.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Physical
Hongwei Ming, Chen Zhu, Tao Chen, Shuhuan Yang, Yong Chen, Jian Zhang, Di Li, Hongxing Xin, Xiaoying Qin
Summary: By reducing stacking fault energy and using nanoneedles, the lattice thermal conductivity of Cu2SnSe3 thermoelectric compound is successfully reduced. The aspect ratio of the nanoneedles and stacking faults play important roles in scattering low frequency phonons in multi-component alloys/compounds.
Article
Chemistry, Physical
Li Ai, Hongwei Ming, Tao Chen, Ke Chen, Jinhua Zhang, Jian Zhang, Xiaoying Qin, Di Li
Summary: Cu3-yAgySb1-xGexSe4 (x = 0, 0.04, 0.06, 0.08, 0.10, 0.12; y = 0, 0.1, 0.2, 0.3, 0.4) is fabricated using a high-temperature melting process, and its thermoelectric properties are investigated in the temperature range of 300-700 K. Ge doping increases carrier concentration, reducing electrical resistivity, while Ag alloying significantly reduces thermal conductivity and enhances the power factor. Consequently, a maximum figure of merit of 0.95 is achieved for Cu2.7Ag0.3Sb0.94Ge0.06Se4 and Cu2.6Ag0.4Sb0.94Ge0.06Se4 at 700 K, surpassing most reported Cu3SbSe4-based systems.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Engineering, Environmental
Shuhuan Yang, Hongwei Ming, Di Li, Tao Chen, Shujin Li, Jian Zhang, Hongxing Xin, Xiaoying Qin
Summary: This study investigates the effect of incorporating conductive polyaniline nanoparticles on the thermoelectric performance of Bi2Te3-based alloys. It is found that the inclusion of polyaniline nanoparticles can reduce the lattice thermal conductivity of the composite system by increasing phonon scattering and enhance the thermopower by inducing energy-dependent carrier scattering at the inorganic/organic boundaries. The composite sample with 1.5 wt% PANI inclusions achieves the maximum figure of merit Zmax = 3.57 x 10-3 K-1 (300 K) and the maximum dimensionless figure of merit ZTmax = 1.22 (345 K), which are 42% and 46% higher than those of pristine Bi2Te2.7Se0.3, respectively, demonstrating the effectiveness of incorporating nanophase polyaniline to enhance the thermoelectric performance.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Hongwei Ming, Chen Zhu, Tao Chen, Shuhuan Yang, Yong Chen, Hongxing Xin, Jian Zhang, Di Li, Xiaoying Qin
Summary: Current understanding of the intrinsic point defects and potential extrinsic dopants in p-type Cu2SnSe3 is limited. The dominant intrinsic defects in Cu(2)SnSe(3) are Cu-Sn and V-Cu under different chemical conditions. The substitution of Al, Ga, In, Cd, Zn, Fe, and Mn for Sn can inhibit the formation of V-Cu, while introducing Cu-Sn, Fe-Sn, Mn-Sn, and Ni-Cu defects can enhance electronic density of states. Introducing Ag-Cu, Al-Sn, Zn-Sn, Ge-Sn, and Mn-Sn defects can lower lattice thermal conductivity remarkably, providing insights for improving the thermoelectric properties.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Lulu Huang, Yuanyue Li, Shengmao Sha, Bangzhi Ge, Yucheng Wu, Jian Yan, Yuan Kong, Jian Zhang
Summary: Defect engineering is an effective method to suppress lattice thermal conductivity. By designing multiple microstructural defects, such as vacancies, holes, nano precipitates, dislocations, and strain, in Cu1-xAgxGaTe2 solid solutions, the thermal conductivity is significantly reduced, leading to record-breaking thermoelectric performance.
Article
Nanoscience & Nanotechnology
Mazhar Hussain Danish, Shuhuan Yang, Hongwei Ming, Tao Chen, Qing Wang, Jian Zhang, Di Li, Zhiliang Li, Xiaoying Qin
Summary: By appropriately substituting Nb for W in WSe2, the thermoelectric performance of WSe2 can be significantly improved, with the thermopower (S) increased by about 10 times to 5.44 mu W cm-1 K-2 (at 850 K) and the lattice thermal conductivity (kappa L) reduced from 1.70 to 0.80 W m-1 K-1. The increase in power factor (PF) is attributed to the increased hole concentration and enhanced thermopower (S), while the decrease in kappa L is mainly due to phonon scattering at point defects NbW. A record high figure of merit max of about 0.42 is achieved at 850 K for the doped sample W0.95Nb0.05Se2, which is about 13 times larger than that of pristine WSe2, demonstrating the effectiveness of Nb doping at the W site in improving the TE performance of WSe2.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Weiqun Lu, Hyungseok Lee, Joonil Cha, Jian Zhang, In Chung
Summary: This study demonstrates a facile and reversible single-crystal to single-crystal intercalation process to modify the electronic structure of honeycomb Mott insulator RuCl3. The resulting hybrid superlattice shows a reduced Mott-Hubbard gap and significantly improved electrical conductivity. This approach provides a new strategy to control Mott insulators and explore exotic physical phenomena.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Nanoscience & Nanotechnology
Shujin Li, Tao Chen, Shuhuan Yang, Ke Chen, Mazhar Hussain Danish, Hongxing Xin, Chunjun Song, Yunchen Dou, Di Li, Jian Zhang, Xiaoying Qin
Summary: By dispersing Ag2Te nanophase in BTS, the power factor (PF) is elevated by 14% and the thermal conductivity is reduced by 29%. The incorporation of nanophase Ag2Te leads to a maximum ZT of 1.31 and an average ZT of 1.16, demonstrating the effectiveness of this approach in boosting the thermoelectric performance of BTS.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Inorganic & Nuclear
K. Chen, T. Chen, L. Ai, H. W. Ming, S. J. Li, J. Zhang, X. Y. Qin, H. X. Xin, C. J. Song, D. Li
Summary: In this work, a Bi2Te2.5Se0.5 matrix dispersed with Ag2Se nanoparticles is fabricated, leading to significant improvements in the thermoelectric properties of the material. The increased electron mobility and optimized carrier concentration result in enhanced thermoelectric performance, while the introduction of Ag2Se nanoparticles reduces thermal conductivity. The results show that this strategy effectively enhances the TE performance and mechanical properties of n-type Bi2Te3-based materials.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Multidisciplinary
Wei Wu, Chen Zhu, Hongwei Ming, Tao Chen, Di Li, Xiaoying Qin, Jian Zhang
Summary: The exploration of n-type PbTe materials has been historically behind due to its distinct electronic band structure and lower power factor. In this study, n-type Pb0.97Sb0.03Te-based composites incorporated with Cu12Sb4S13 nanoparticles were synthesized and investigated. The results showed that controlling Sb doping and incorporating Cu12Sb4S13 nanoparticles effectively improved the thermoelectric performance of n-type Pb0.97Sb0.03Te, indicating the promising potential of this method.
Article
Chemistry, Inorganic & Nuclear
Tao Chen, Hongwei Ming, Xiaoying Qin, Chen Zhu, Yong Chen, Li Ai, Di Li, Yongsheng Zhang, Hongxing Xin, Jian Zhang
Summary: The incorporation of Ag9AlSe6 phase into BTS can significantly reduce lattice thermal conductivity and enhance the Seebeck coefficient, leading to an improvement in thermoelectric performance.
INORGANIC CHEMISTRY FRONTIERS
(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)
