Article
Chemistry, Inorganic & Nuclear
Zhan Gao, Guo-ge Lu, Liu-cheng Cao, Zong-xiu Zhu, Ying-xin Li, Fu-xiang Wei, Zhe Ji, Yan-wei Sui, Ji-qiu Qi, Qing-kun Meng, Yao-jian Ren
Summary: Core-shell structured Mn2O3@ZnMn2O4/C hollow microspheres are reported as an ideal cathode material for AZIBs, addressing the problems of capacity decline and low-rate performance. Its application in AZIBs demonstrates satisfactory rate performance, high cycle stability, and excellent reversibility. With a high reversible capacity reaching 289.9 mA h g(-1) and maintaining 203.5 mA h g(-1) after cycling 700 times at 1000 mA g(-1), this material shows great potential for AZIBs.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Analytical
Shichao Wang, Xiaohu Wang, Gaoqun Qiao, Xiaoyan Chen, Xinzhen Wang, Hongzhi Cui
Summary: Core-double shell-structured ZnO@In2O3@ZnO microspheres were successfully synthesized by decorating In2O3 and ZnO on the surface of ZnO hollow microspheres, exhibiting excellent gas sensing properties with high response to gases like ethanol, especially at low concentrations. This superior gas sensing performance was attributed to its high specific surface area, abundant surface defects, and radial electronic modulation mechanism.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Materials Science, Ceramics
Kedong Xia, Chuangchuang Li, Hui Zhang, Siyu Zhao, Weichen Li, Fang Han, Yuwei Li, Xiao Liu
Summary: Hollow silicon oxycarbide (SiOC) ceramic microspheres were synthesized by solvothermal process and subsequent high-temperature pyrolysis. Increasing the synthesis temperature leads to a decrease in Si-C bond and C content in SiOC ceramics, and transforms amorphous SiOC ceramics into cristobalite SiO2. The rearrangement reaction of oxygen-enriched structural units increases the SiO2C2 unit. SiC nano-crystals mainly come from the carbothermal reduction reaction of SiO2 with free C at 1400 degrees C without phase separation. The size change of SiO2 nanograins was investigated by HF etching, resulting in the obtaining of porous carbon after removal of SiO2.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Analytical
Hao Zhang, Jianghan Hu, Mingwei Li, Zhenhua Li, Ye Yuan, Xueli Yang, Lanlan Guo
Summary: A facile solvothermal method was employed to synthesize hollow urchin-like core-shell spinel structured ZnO/ZnFe2O4 composite and pure ZnFe2O4 sensing material. Different ratios of Zn to Fe in the precursor resulted in different final components of the products. Gas sensors based on these materials exhibited high gas response to toluene, with the pure ZnFe2O4 sensor showing a lower operating temperature and higher gas response. The sensing mechanism was analyzed in detail in combination with BET and XPS results.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Physical
Leila Raafat, Fanny Thorimbert, Achim M. Diem, Bernhard Fenk, Joachim Bill, Zaklina Burghard
Summary: This study investigates the synthesis and electrochemical performance of a novel high operating potential cathode material, lithium nickel phosphate (LNP). LNP synthesized by the polyol-mediated method exhibits high electrochemical activity, achieving high capacity and energy density.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Chemistry, Physical
Chenxi Han, Xiqing Xu, Hao Mu, Qiang Tian, Qiang Li, Yitong Liu, Xuan Zhang, Zhenhuan Zhao, Xinghua Su
Summary: The construction of binder-free electrodes with hierarchical core-shell nanostructures has been shown to be an effective way to enhance the electrochemical performance of supercapacitors. The electrode prepared in this work exhibited high specific capacitance, excellent rate performance, and outstanding cycle stability due to the advantages brought by unique porous architecture and synergistic effect of the multi-component composites. Additionally, the assembled asymmetric supercapacitor achieved high energy density and long durability.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Juan Wang, Mingwang Pan, Jinfeng Yuan, Gang Liu, Lei Zhu
Summary: A one pot nanoengineering strategy inspired by the automatic transport behavior of water in plants was successfully developed to fabricate spheres-on-sphere (SOS) microspheres with hollow cavities and hierarchical structure. By removing the polystyrene (PS) phase in SOS particles, particles with multiscale hollow structure (SOS-MH) were obtained, reducing the thermal conductivity of composite fibrous membranes and improving moisture resistance.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Linhe Yu, Qihao Yang, Guozhen Zhu, Renchao Che
Summary: Core-shell honeycomb-like Co3O4@C microspheres were synthesized and exhibited long cycling life and excellent rate capability, providing a new idea for the development of high-performance lithium-ion battery anode materials.
Article
Chemistry, Inorganic & Nuclear
Ping Luo, Wen Tang, Wanyue Cai, Jing Yang, Wenwei Zhang, Chunli Zuo, Gangyuan Liu, Yao Xiao, Shijie Dong
Summary: The lack of suitable cathode materials has been a critical factor hindering the development of aqueous zinc-ion batteries (AZIBs). This study successfully designed and fabricated ZnO/ZnV2O4 composite hollow microspheres as cathode materials for AZIBs, demonstrating excellent performance and providing a new direction for the application of low valent vanadium-based materials in multivalent-ion batteries.
JOURNAL OF SOLID STATE CHEMISTRY
(2021)
Article
Chemistry, Analytical
Bin Jiang, Wei Tao, Liupeng Zhao, Tianshuang Wang, Xiaomin Liu, Fangmeng Liu, Xu Yan, Yanfeng Sun, Geyu Lu, Peng Sun
Summary: Oxide semiconductors with multi-shell hollow architecture have great potential as sensing materials in high-performance gas sensors. In this study, solid, core-shell, and double-shell zinc oxide (ZnO) microspheres were successfully synthesized using a template-free method. Compared to the other two structures, the gas sensor based on the double-shell structure exhibited the highest response to 100 ppm ethanol at 275 degrees C (-47.4), which was 4.8 times higher than that of the solid structure (-9.8) under the same conditions. Furthermore, the detection limit of the double-shell ZnO microsphere was as low as 1 ppm. The enhancement mechanism of the ethanol gas-sensing performance was systematically discussed.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Multidisciplinary
Chengjie Yin, Cheng-Ling Pan, Yusong Pan, Jinsong Hu
Summary: Novelhollow Mn-Co-O@C yolk-shell microspheres with carbon shells were synthesized from self-assembled Mn-Co-MOF. The hollow structure with high specific surface areas and mesoporous structure effectively buffered the large volume change, providing additional storage sites and rapid electron/ion transfer. Cobalt doping decelerated the dissolution of Mn2+, maintained good structural stability, and improved the specific capacity due to the multielectron redox reaction of cobalt. The carbon coating further inhibited the dissolution of manganese and exhibited high conductivity and thermal stability. The Mn-Co-O@C hybrid showed promising potential as a cathode material for AZIBs, achieving an excellent specific capacity and capacity retention after cycling.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Chemistry, Multidisciplinary
Ruling Huang, Jiao Lin, Jiahui Zhou, Ersha Fan, Xixue Zhang, Renjie Chen, Feng Wu, Li Li
Summary: Hierarchical MnCo2O4 hollow microspheres with three porous shells have been fabricated as anode materials for potassium-ion batteries, showing enhanced rate performance and demonstrated substance transformation during charging/discharging processes using in situ X-ray diffraction strategy.
Article
Chemistry, Physical
Ruyue Guo, Yan Bao, Qiaoling Kang, Chao Liu, Wenbo Zhang, Qian Zhu
Summary: Hollow titanium dioxide (TiO2) microspheres are important metal oxide nanomaterials whose properties are significantly influenced by the properties of organic solvents. This study synthesized hollow TiO2 microspheres using a mixture of different organic solvents and found that acetone played a crucial role in the construction of hollow structures, resulting in enhanced controllability and degradation performance.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2022)
Article
Chemistry, Physical
Liang Chai, Yiqun Wang, Nifan Zhou, Yu Du, Xiaodong Zeng, Shiyi Zhou, Qinchuan He, Guanglei Wu
Summary: ZnFe2O4@PHCMS composite material with excellent microwave absorption properties was successfully synthesized in this study, with a maximum adsorption capacity of -51.43 dB. Through mechanisms such as suitable impedance characteristic, dipole polarization, and interfacial polarization, effective electromagnetic wave absorption was achieved.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2021)
Article
Chemistry, Inorganic & Nuclear
Xuefei Zhang, Tao Lei, Miao Xia, Qiao-Hua Wei, Zailai Xie
Summary: In this study, Mo2C@NC/Mo2C hollow microspheres with outstanding catalytic activity and fast kinetics in hydrogen evolution were synthesized via a hydrothermal self-assembly process. The improved activity of Mo2C@NC/Mo2C can be attributed to the large ratio of exposed active sites and abundant interfacial structures. This work provides a new template-free strategy for the design of highly active Mo2C@NC/Mo2C hollow microsphere HER catalysts.
DALTON TRANSACTIONS
(2023)
Article
Nanoscience & Nanotechnology
Shengqing Xue, Guohua Gao, Zenghai Zhang, Xiaodi Jiang, Jun Shen, Guangming Wu, Hanyu Dai, Yuyang Xu, Yao Xiao
Summary: Nanoporous WO3 films with pore sizes ranging from 10 to 16 nm were prepared through sol-gel methods with an organic template, showing good thermal stability, fast coloring/bleaching ability, and excellent cycling performance after annealing at 200 degrees C. Gasochromic windows with nanoporous films have high energy-saving potential.
ACS APPLIED NANO MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Guohua Gao, Mingze Ji, Kun Zhang, Guangming Wu
Summary: By using the ex-situ composite method, graphene-coated vanadium oxide nanotubes were successfully prepared, showing improved stability and alleviation of volume changes during charge and discharge processes. The experimental results demonstrated that VNT/rGO exhibited a higher capacity retention rate.
ELECTRONIC MATERIALS LETTERS
(2022)
Article
Materials Science, Ceramics
Guohua Gao, Shengqing Xue, Haoran Wang, Zenghai Zhang, Jun Shen, Guangming Wu
Summary: In this study, the medium-scale production process of tungsten oxide gasochromic windows was systematically studied, and a large-scale gasochromic window was successfully prepared. Furthermore, an energy-saving evaluation method for gasochromic windows was proposed, which can be used to assess the annual energy-saving performance of the windows.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Guohua Gao, Shengqing Xue, Haoran Wang, Zenghai Zhang, Guangming Wu, Tekalign Terfa Debela, Hong Seok Kang
Summary: Although smart energy-saving windows have promising applications, such as electro-chromic, thermochromic, and gasochromic windows, they are still delayed due to the lack of suitable manufacturing methods. Printing methods have been widely studied for cost-effective electrochromic film deposition, but the porosity of gasochromic films limits the use of traditional inks. A novel WO3/SiO2 ink with suitable rheological characteristics for gasochromic windows was developed in this study by prehydrolyzing and condensing SiO2 in a neutral solution. By using automated printing methods, porous SiO2 skeletons supporting WO3 gasochromic films were synthesized, exhibiting high transmittance, solar energy shielding, and annealing stability.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Nanoscience & Nanotechnology
Wenchao Bi, Xiaodi Jiang, Chao Li, Yuan Liu, Guohua Gao, Guangming Wu, Muhammad Atif, Mohamad AlSalhi, Guozhong Cao
Summary: This study focuses on the preparation and investigation of nanomaterials tailored for supercapacitors. It is found that Na+ ions exhibit faster diffusion in the nanomaterials, leading to better charge storage capability and stability.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Jiabao Wang, Zhenkai Ji, Xiuzhen Xu, Tiantian Chen, Bo Chen, Guohua Gao, Jiwei Ma, Xipeng Nie, Xiaobin Xu
Summary: This work presents a hybrid lithographic method for growing TiO2 nanorod arrays with arbitrary patterns. The method combines top-down soft lithography and bottom-up hydrothermal approach. The morphology and density of the nanorods can be controlled by adjusting the precursor concentration, reaction time, temperature, and patterns. The work provides a new strategy for the low-cost and facile preparation of patterned TiO2 nanorod arrays and has potential applications in micro-nano-optoelectronic devices and other fields.
Article
Chemistry, Multidisciplinary
Mingze Ji, Jie Ni, Xing Liang, Qian Cheng, Guohua Gao, Guangming Wu, Qiangfeng Xiao
Summary: This study reports the synthesis of VOx@C yolk-shell nanospheres using biomimicking prey-predation and demonstrates their potential application as a regenerative polysulfide-scavenging layer for high-loading Li-S batteries.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Xiaoyu Zhang, Zhenyu Hu, Qi Sun, Xing Liang, Puzhong Gu, Jia Huang, Guoqing Zu
Summary: This paper reports a method for preparing wearable electronics with a gradient porous structure and an ultrabroad detection range. These electronics exhibit excellent strain transfer and resistance variation under high pressures, making them suitable for electronic skins and monitoring automobile tire pressure. Furthermore, the gradient aerogels used in this method can also be used for water purification.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Energy & Fuels
Min Guo, Yawei Zhang, Shaohong Qi, Tiancun Liu, Jiadi Ying, Yeqing Wang, Yanfu Chai, Guohua Gao, Zhixin Yu
Summary: This work presents a modified NASICON-type Na3V2(PO4)(3) cathode material for sodium-ion batteries, with Ni2+ doping and hierarchical porous morphology design to enhance ion migration and improve electronic conductivity. The as-synthesized material exhibits large surface area, short transport distance, easy electrolyte infiltration, and rapid electron/ion transportation, resulting in superior rate capability and cycling stability compared to the bare counterpart. The NVP-Ni0.05 cathode shows impressive rate capability (88.1 mAh g(-1) at 20C) and excellent cycling stability (93.8% capacity retention after 1500 cycles at 10C). This study provides a feasible strategy for developing high-rate and long cycle-life electrode materials and may inspire research into other sodium-based cathode materials.
Article
Physics, Applied
Xiaodi Jiang, Mingze Ji, Guohua Gao, Xu Yan, Zheng Xu, Wenchao Bi, Qian Cheng, Guangming Wu
Summary: A double high-elastic-modulus modification (DHEMM) method is proposed to improve the stability of lithium-ion batteries. TiO2/V2O5/polypyrrole (PPy) nanofibers are synthesized, leading to significantly enhanced rate capacity and electrochemical stability.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Multidisciplinary
Xiaoyu Zhang, Sheng Zeng, Zhenyu Hu, Xing Liang, Qi Sun, Jia Huang, Guoqing Zu
Summary: This article reports on the preparation of a highly flexible pressure sensor based on a gradient PIL (poly(ionic liquid)) ionogel. The sensor exhibits an ultrabroad detection range of 10 Pa to 1 MPa and is able to monitor both low and high pressures during human body movements. This work provides a powerful strategy for the preparation of flexible gradient materials for wearable electronics with wide pressure detection range.
ACS MATERIALS LETTERS
(2022)
Article
Chemistry, Physical
Xing Liang, Guohua Gao, Xiaodi Jiang, Wenjie Zhang, Wenchao Bi, Jichao Wang, Yuchuan Du, Guangming Wu
ACS APPLIED ENERGY MATERIALS
(2020)
Article
Chemistry, Multidisciplinary
Qilang Wang, Xing Liang, Bohai Liu, Yihui Song, Guohua Gao, Xiangfan Xu
Article
Chemistry, Physical
Jiandong Wu, Guohua Gao, Guangming Wu, Limeng Liu, Jinfu Ma, Yuhong Chen
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2019)
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)