Article
Chemistry, Multidisciplinary
Zixuan Chen, Hong-Hua Cui, Shiqiang Hao, Yukun Liu, Hui Liu, Jing Zhou, Yan Yu, Qingyu Yan, Christopher Wolverton, Vinayak P. Dravid, Zhong-Zhen Luo, Zhigang Zou, Mercouri G. Kanatzidis
Summary: PbS is a highly attractive member of the lead chalcogenides. By introducing GaSb doping, the conduction band of n-type PbS can converge, leading to improved electrical transport performance. This results in record-high power factor and figure of merit values, surpassing other PbS-based thermoelectric materials.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Hanhwi Jang, Jong Ho Park, Ho Seong Lee, Byungki Ryu, Su-Dong Park, Hyeon-Ah Ju, Sang-Hyeok Yang, Young-Min Kim, Woo Hyun Nam, Heng Wang, James Male, Gerald Jeffrey Snyder, Minjoon Kim, Yeon Sik Jung, Min-Wook Oh
Summary: Suppressing Te vacancies by Ag doping can achieve high thermoelectric performance, and the synergy between defect and carrier engineering offers a pathway for enhancing the properties of thermoelectric materials.
Article
Materials Science, Multidisciplinary
Esteban Zuniga-Puelles, Volodymyr Levytskyi, Ayberk oezden, Tanju Guerel, Nebahat Bulut, Cameliu Himcinschi, Cem Sevik, Jens Kortus, Roman Gumeniuk
Summary: X-ray diffraction and energy dispersive x-ray spectroscopic analyses were carried out on a natural galena crystal from Germany, revealing it to be a single phase specimen with a rock salt structure type and stoichiometric composition. It showed an enhanced dislocation density, resulting in an increase in electrical resistivity at high temperatures and the appearance of a phonon resonance with a characteristic frequency of 3.8 THz. At lower temperatures, the thermal conductivity was drastically reduced and a characteristic minimum in thermal conductivity was observed at around 30 K.
Article
Chemistry, Physical
Jiayu Zhou, Yixuan Wu, Zhiwei Chen, Pengfei Nan, Binghui Ge, Wen Li, Yanzhong Pei
Summary: The introduction of point defects and dislocations through alloying and co-doping has been shown to significantly reduce lattice thermal conductivity, leading to a substantial improvement in thermoelectric performance.
Article
Chemistry, Physical
Junsang Cho, Taegyu Park, Ki Wook Bae, Hyun-Sik Kim, Soon-Mok Choi, Sang-il Kim, Sung Wng Kim
Summary: The addition of titanium can effectively reduce the grain size of Hf0.5Zr0.5NiSn0.98Sb0.02 half-Heusler compound, resulting in extremely low lattice thermal conductivity across the entire temperature range, and achieving the maximum thermoelectric figure of merit at 800 K.
Article
Chemistry, Physical
Shibo Liu, Yongxin Qin, Bingchao Qin, Yu Xiao, Li-Dong Zhao
Summary: By alloying Sn in PbTe to decrease its band gap, the average ZT value of n-type Pb0.785Sn0.2Sb0.015Te reaches approximately 0.74 in the temperature range of 300-723 K, showing promising cooling performance.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Multidisciplinary Sciences
Binbin Jiang, Yong Yu, Juan Cui, Xixi Liu, Lin Xie, Jincheng Liao, Qihao Zhang, Yi Huang, Shoucong Ning, Baohai Jia, Bin Zhu, Shengqiang Bai, Lidong Chen, Stephen J. Pennycook, Jiaqing He
Summary: By utilizing entropy-driven structural stabilization, we increased the figure of merit (zT) value to 1.8 in an n-type PbSe-based high-entropy material at 900 kelvin, showcasing a promising method to enhance the performance of thermoelectric materials.
Article
Chemistry, Physical
Christian Moeslund Zeuthen, Lasse Rabol Jorgensen, Lise Joost Stockler, Martin Roelsgaard, Ann-Christin Dippel, Bo Brummerstedt Iversen
Summary: Hierarchical thermoelectric materials have achieved record-breaking thermoelectric figures-of-merit, with PbS nanoinclusions in PbTe growing in size under operating conditions without diminishing the thermoelectric performance. These nanoinclusions primarily affect the electrical properties at elevated temperatures.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Physical
Qingrui Xia, Pengzhan Ying, Zhongkang Han, Xie Li, Liangliang Xu, Jiaolin Cui
Summary: By engineering the chemical compositions of n-type AgBiSe2, the lattice thermal conductivity is reduced and power factor is enhanced, ultimately leading to a significant increase in the ZT value.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Vaithinathan Karthikeyan, Saw Lin Oo, James Utama Surjadi, Xiaocui Li, Vaskuri C. S. Theja, Venkataramanan Kannan, Siu Chuen Lau, Yang Lu, Kwok-Ho Lam, Vellaisamy A. L. Roy
Summary: Optimizing intrinsic defects in polycrystalline SnSe through controlled alpha irradiation can lead to a high zT value of 2.4 at 800 K, along with significantly reducing lattice thermal conductivity. This strategy of intrinsic defect engineering shows great potential in increasing the practical implementation of low-cost and high-performance thermoelectric generators.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Jinchang Sun, Wenjun Cui, Chenghao Xie, Tian Yu, Fan Yan, Zhiquan Chen, Xiahan Sang, Xinfeng Tang, Gangjian Tan
Summary: In this study, the presence of Pb vacancies in Sn-substituted Pb0.98Na0.02Se was effectively inhibited by doping a dilute amount of Te, leading to a remarkable recovery of carrier mobility. Moreover, Te doping resulted in a significant reduction in lattice thermal conductivity by reinforcing phonon scattering. As a result, the average ZT value of Pb0.97Sn0.01Na0.02Se was doubled upon 6 mol % Te doping between 300 and 773 K.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Chao Yong, Ying Lei, Rui Liu, Yu Li, Lei Tao, Feng Gao, Jin Qiu, Yinghui Liu, Huaichuan Hu
Summary: Nearly single-phase Yb-filled and Te-doped YbxCo4Sb11.5Te0.5 were prepared by microwave and further densified by spark plasma sintering. The experimental results show that Yb filling and Te doping significantly improve the electrical properties and reduce the lattice thermal conductivity. The maximum power factor of Yb0.2Co4Sb11.5Te0.5 is 4364.45 mu Wm- 1K-2 at 675 K. Analysis suggests that the resonance scattering from Yb filling and the defect scattering and stress field fluctuation introduced by Te doping effectively limit the thermal transport performance. The total thermal conductivity of Yb0.2Co4Sb11.5Te0.5 is 2.68-3.74 Wm-1 K -1 in the temperature range of 300-775 K, and the maximum ZT is 1.25 at 775 K, indicating that Yb filling and Te doping improve the electrical properties and reduce the thermal conductivity by limiting the mean free path of phonons.
MATERIALS RESEARCH BULLETIN
(2023)
Review
Engineering, Environmental
Wei Liu, Liqing Xu, Yu Xiao, Li-Dong Zhao
Summary: This paper discusses effective strategies to improve the thermoelectric performance of PbS-based materials, including carrier density optimization, band structure manipulations to tune carrier effective mass, band alignment to maintain high carrier mobility, and defect design to block phonon transport. Both n-type and p-type PbS systems are separately discussed due to their different optimizing strategies. Finally, some possible strategies are proposed to further improve the thermoelectric performance of PbS-based materials.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
D. Sidharth, A. S. Alagar Nedunchezhian, R. Rajkumar, K. Kalaiarasan, M. Arivanandhan, K. Fujiwara, G. Anbalagan, R. Jayavel
Summary: Recently, Cu substitution has been found to enhance the thermoelectric performance of GeSe-based materials, resulting in high power factor and figure of merit values. The incorporation of Cu leads to the formation of multiphases in the Ge1-xCuxSe samples, which improves the electrical resistivity and mobility of the material. The study demonstrates the potential of Cu-substituted GeSe as a promising thermoelectric material.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Rui Cheng, Dongyang Wang, Hui Bai, Jinsong Wu, Wei Liu, Li-Dong Zhao, Xinfeng Tang, Gangjian Tan
Summary: The study shows that introducing 30 mol% PbSe successfully bridges the miscibility gap between PbS and PbTe, significantly extending the solubility limit of PbTe in PbS, reducing lattice thermal conductivity. Moreover, the experimental results indicate that the carrier mobility of PbS is negligibly affected by the heavy alloying process, contrary to conventional knowledge.
Article
Chemistry, Physical
Siqi Wang, Cheng Chang, Shulin Bai, Bingchao Qin, Yingcai Zhu, Shaoping Zhan, Junqing Zheng, Shuwei Tang, Li-Dong Zhao
Summary: Fine tuning of defects can significantly enhance carrier mobility and improve thermoelectric performance, resulting in the highest thermoelectric efficiency.
CHEMISTRY OF MATERIALS
(2023)
Review
Engineering, Environmental
Wei Liu, Liqing Xu, Yu Xiao, Li-Dong Zhao
Summary: This paper discusses effective strategies to improve the thermoelectric performance of PbS-based materials, including carrier density optimization, band structure manipulations to tune carrier effective mass, band alignment to maintain high carrier mobility, and defect design to block phonon transport. Both n-type and p-type PbS systems are separately discussed due to their different optimizing strategies. Finally, some possible strategies are proposed to further improve the thermoelectric performance of PbS-based materials.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Multidisciplinary Sciences
Bingchao Qin, Dongyang Wang, Tao Hong, Yuping Wang, Dongrui Liu, Ziyuan Wang, Xiang Gao, Zhen-Hua Ge, Li-Dong Zhao
Summary: Researchers achieve high-performance SnSe crystals with promising device efficiencies by modifying crystal and band structures.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Lizhong Su, Haonan Shi, Sining Wang, Dongyang Wang, Bingchao Qin, Yuping Wang, Cheng Chang, Li-Dong Zhao
Summary: Thermoelectric materials have the potential for refrigeration and power generation through direct heat-to-electricity conversion. Carrier mobility and Seebeck coefficient are crucial properties of these materials. This study emphasizes the importance of modifying the scattering factor to enhance the electrical properties. Anisotropic scattering factor is found to enhance carrier mobility and Seebeck coefficient in anion-doped n-type tin selenide crystals, suggesting the potential for improving electrical properties. Using this strategy, the average dimensionless figure of merit (ZT(ave)) for iodine-doped SnSe crystals is significantly improved from 0.84 to 1.57 in the temperature range of 300-773 K. These results highlight the critical role of scattering factor and propose a novel perspective for enhancing carrier mobility, offering a new strategy for optimizing thermoelectric performance.
ADVANCED ENERGY MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Yuping Wang, Lizhong Su, Haonan Shi, Xiang Gao, Tao Hong, Bingchao Qin, Li-Dong Zhao
Summary: With in-depth research on the thermoelectric properties of 2D and 3D materials, the study explores the relationship between thermoelectric transport and phase structures of 2D-3D heterostructures. Through experimental measurements and theoretical calculations, it is discovered that the reduction in lattice thermal conductivity is more significant in samples with small amounts of heterostructure phases. The presence of low symmetrical-PbSe and high symmetrical-SnSe phases in the heterostructures is experimentally confirmed at the microscopic scale. This study provides a perspective and investigation method to unravel the structural details and transport properties of 2D-3D heterostructure composites.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Lei Wang, Xiao Zhang, Li -Dong Zhao
Summary: Thermoelectric materials play a crucial role in improving energy utilization efficiency and promoting sustainable development. The Seebeck coefficient is a key parameter for conversion efficiency, and researchers have explored various methods to increase it. This article focuses on the physical mechanisms affecting the Seebeck coefficient, traditional and innovative approaches to optimize it, and promising interdisciplinary strategies for further improvement.
ACCOUNTS OF MATERIALS RESEARCH
(2023)
Review
Chemistry, Multidisciplinary
Shulin Bai, Xiao Zhang, Li-Dong Zhao
Summary: This article introduces the recent advancements in developing high-performance thermoelectric SnSe crystals through computational materials science. The research focuses on analyzing the structure and characteristics of materials to identify promising candidates, such as layered SnSe crystals and Pb-alloyed and Cl-doped SnSe crystals. The potential of combining high-throughput calculations and machine learning is also discussed as a promising avenue for future thermoelectrics research and development.
ACCOUNTS OF CHEMICAL RESEARCH
(2023)
Article
Physics, Applied
Yuping Wang, Bingchao Qin, Li-Dong Zhao
Summary: This perspective summarizes the strategies to improve the thermoelectric properties of polycrystal SnSe, including composition control and process control. Recently, a novel structure control strategy was implemented to modulate the crystal structure of SnSe, resulting in significantly different thermoelectric transports and high-ranged overall ZT values. This structure control strategy provides an effective way to enhance the wide-range thermoelectric performance of polycrystal SnSe and offers a new research idea for the development of highly efficient thermoelectric materials.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Si-Ning Wang, Han-Chen Lu, Du-Jiang Li, Yang Jin, Xing-Yi Li, Yan Yan, Kai Gu, Yu-Ting Qiu, Li-Dong Zhao
Summary: This study successfully prepared p-type BiSbSe3 through Pb doping and investigated its thermoelectric transport properties. The results indicate that Pb doping can further reduce the thermal conductivity of BiSbSe3 and maintain stable p-type transmission in the mid-temperature region.
Article
Chemistry, Multidisciplinary
Zhiyue Tang, Cheng Wu, Shurong Wang, Yu Xiao, Liming Ding, Feng Hao
Summary: Aniline was introduced into a solution of tin halide perovskite precursor to interact with formamidinium iodide (FAI) through hydrogen bonding, improving the crystal orientation and leading to enhanced charge transport and structural stabilization in lead-free tin halide perovskite solar cells. These cells achieved a power conversion efficiency of 12.04% and a high open-circuit voltage of 788 mV.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Haonan Shi, Lizhong Su, Shulin Bai, Bingchao Qin, Yuping Wang, Shan Liu, Cheng Chang, Li-Dong Zhao
Summary: Researchers have successfully increased the carrier mobility of n-type SnSe crystals to & SIM;445 cm(2) V-1 s(-1) at room temperature by alloying, achieving unobstructed in-plane electrical transport and a high power factor of & SIM;15.3 & mu;W cm(-1) K-2 at 300 K. Combined with suppressed thermal conductivity, a ZT of & SIM;0.4 at 300 K and an average ZT of & SIM;0.74 at 300-773 K are obtained. These results demonstrate the notable potential of the in-plane performance of n-type SnSe crystals in thermoelectric cooling devices.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Physical
Yuping Wang, Shulin Bai, Haonan Shi, Qian Cao, Bingchao Qin, Li-Dong Zhao
Summary: In recent years, the thermoelectric properties of SnSe crystals have shown remarkable performance, however, the polycrystalline SnSe has been hindered by grain boundary scattering, which leads to reduced carrier mobility and electrical transport. This research introduces the tetragonal-structure AgInSe2 and Ge alloying to modify the crystal structure and band structure of SnSe, enhancing carrier mobility and suppressing phonon transport. This systematic approach effectively decouples phonon-electron transport, resulting in significantly improved thermoelectric performance.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Materials Science, Multidisciplinary
Ruihuan Cheng, Xingchen Shen, Stefan Klotz, Zezhu Zeng, Zehua Li, Alexandre Ivanov, Yu Xiao, Li-Dong Zhao, Frank Weber, Yue Chen
Summary: In this study, the high-pressure lattice dynamics of PbTe were investigated using molecular dynamics simulations. The results show that the transverse-optical mode and the frequency of the transverse-acoustic phonon exhibit non-monotonic pressure dependence under high pressure. The theoretical predictions were compared with experimental data, and the phonon transport mechanisms were revealed by calculating the pressure-dependent lattice thermal conductivity.
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)
