International Journal of Minerals Metallurgy and Materials
·
2025
·Vol. 32
·期 3
·668-677
·
IF 7.2
Huo Yuying,Wang Zhengyan,Zhang Yanlan,Wang Yongzhen
High-entropy design is attracting growing interest as it offers unique structures and unprecedented application potential for materials. In this article, a novel high-entropy ferrite (CoNi) x /2 (CuZnAl) (1− x )/3 Fe 2 O 4 ( x = 0.25, 0.34, 0.40, 0.50) with a single spinel phase of space group \(Fd\bar{3}m\) was successfully developed by the solid-state reaction method. By tuning the Co–Ni content, the magnetic properties of the material, especially the coercivity, changed regularly, and the microwave absorption properties were improved. In particular, the effective absorption bandwidth of the material increased from 4.8 to 7.2 GHz, and the matched thickness decreased from 3.9 to 2.3 mm, while the minimum reflection loss remained below −20 dB. This study provides a practical method for modifying the properties of ferrites used to absorb electromagnetic waves.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 94
·91394-91400
·
IF 3.289
Jie Xue,Jizhong Song,Yousheng Zou,Chengxue Huo,Yuhui Dong,Leimeng Xu,Jianhai Li,Haibo Zeng
Compared to monometallic counterparts, core–shell structured nanowires may possess additional performances or even new properties because of synergistic effects between two components. Particularly, the alloying shell may bring the advantage that we can adjust its components and sizes to achieve the desired performance. Here, we mainly study Ni-dependent electric stability and opto-electrical performances of Cu@CuNi NW electrodes. And we find that the increase of nickel content has little effect on optical performance, but effectively improves the stability of Cu@CuNi NW electrodes. We can also achieve ideal performance through regulating the nickel content and outstanding performance may come from the particular structure. Hence we studied Ni-dependent microstructure variations of Cu@CuNi NWs with the corresponding properties. The high stability NWs with a high nickel content have smooth CuNi alloying shells which effectively protect the NWs from oxidation. At the same time, the large length diameter ratio and high degree of crystallinity of Cu@CuNi NWs are the reasons for good transparent conductive properties. These demonstrations of controlling the composition of alloying shells for oxidation resistance of the NWs could bring forth great opportunities for transparent, flexible, stretchable, and wearable electronic and optoelectronic devices.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Junbin Lu,Yurun Feng,Jie Liu,Chunmiao Liu,Yanchun Tong,Shigang Wu,Haibin Sun,Hongyu Gong,Xue Guo
The PDCs (polymer-derived ceramics)-SiCN(Ni) fibers with multiple loss mechanisms were prepared by electrospinning. Influenced by the in-situ formed CNTs and Ni 2 Si at the high treatment temperature, the impedance matching performance of fibers was enhanced obviously. In addition, the electromagnetic wave (EMW) absorbing performance was further improved by unique one-dimensional structure of fibers, interfacial polarization, dipole polarization and magnetic loss. Because of good impedance matching and multiple losses, fibers possessed admirable EMW characteristic with strong absorbing ability of the minimum reflection loss (RL) reaching −44.88 dB and the widest effective absorption band (EAB) reaching 4.8 GHz (13.2–18 GHz) at 1.42 mm. Hence, SiCN(Ni) ceramics prepared had a wide application in the field of electromagnetic absorption.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Communications
·
2021
·
IF 3.383
Xiao-Hui Yang,Kai-Fei Wang,Kuo-Chih Chou,Guo-Hua Zhang
Fine grained WC-Co-Ni cemented carbides with a low binder content have been successful manufactured via the powder metallurgy method. The WC-Co-Ni composite powder with homogeneous distributions of Co and Ni was synthesized by chemical co-precipitation with the raw materials of WC powder, oxalic acid and chlorides of Co and Ni. In this study, the effects of cobalt and nickel contents on the properties of cemented carbides were investigated systematically. The experimental results demonstrated that the alloy prepared by vacuum sintering had uniform grain size distribution and no abnormal growth of WC grains. When the cobalt content was 4 wt% and 5 wt%, the obtained composites almost completely consolidated with excellent hardness and fracture toughness. Among them, for the sample WC-4 wt%Co, the relative density could reach 99.37%, and the Vickers hardness and fracture toughness were 2010 HV 30 and 8.55 MPa·m 1/2 , respectively. When Ni was added to replace part of Co, the relative density of WC-Co-Ni decreased and the fracture toughness was improved without basically sacrificing the hardness. For the sample WC-2 wt%Co-2 wt%Ni, the hardness decreased to 1921 HV 30 , while the fracture toughness increased to 8.97 MPa·m 1/2 .
研究领域:
材料科学
·
粉末冶金
✓ 已验证
DOI
高影响因子
Nano Energy
·
2024
·
IF 16.8
Yuxin Rao,Xue Li,Shangquan Zhao,Pengfei Liu,Fanglin Wu,Xiang Liu,Naigen Zhou,Shan Fang,Stefano Passerini
The poor compatibility of carbonate-based electrolytes with lithium metal anodes results in unstable solid electrolyte interphase, leading to lithium dendrite formation, low Coulombic efficiency, and short cycle life. To address this issue, we propose a novel fluorinated electrolyte that leverages lithium bis(fluorosulfonyl)imide (LiFSI), along with fluorinated solvents. An extremely low concentration of lithium nitrate exerts a substantial impact on the Li ion solvation structure, inducing an anions-rich solvation structure, results in an inorganic-rich electrolyte interphase layer mainly composed of Li 3 N and LiF, which effectively inhibits lithium dendrite formation, enhances the interfacial stability between the electrode and electrolyte, and yields excellent cycling performance in lithium metal batteries. When coupled with a high nickel content cathode (LiNi 0.8 Co 0.1 Mn 0.1 O 2 ), the cells exhibit impressive cycling performance with 1000 cycles at 4 C, retaining 68.6 % capacity (with charge times under 15 min). Despite the relatively low oxidation stability of Dimethoxyethane in the electrolyte, the cell demonstrates exceptional high-voltage electrochemical performance, even up to 4.5 V, the cells do not show extensive electrolyte decomposition and structural changes, preserving 79.2 % capacity retention after 300 cycles. Using 50 µm lithium foil in the cells, remarkable capacity retention of 89.5 % is achieved after 400 cycles at 1 C. This remarkable compatibility between the anode and cathode represents a significant breakthrough in enhancing the reliability and performance of lithium metal batteries.
研究领域:
电化学
·
材料科学
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2023
·Vol. 27
·期 10
·2727-2736
·
IF 2.5
Wu Bingxue,Zhang Jian,Yang Zhi,Lu Xuanlin,Zhao Xin,Liu Wen,Chen Jiaxuan,Zhao Yicheng,Li Yongdan
Ni-based cermets are the most widely used anode materials for solid oxide fuel cells. Reducing the content of Ni is beneficial to anode stability but usually unfavorable for the catalytic activity. In this study, Ni-Ce 0.8 Sm 0.2 O 2-δ anode with a low Ni content is synthesized through a polymer-directed evaporation-induced self-assembly strategy. Ni distributes evenly in the anode, resulting in an enlarged triple-phase boundary region and improved reactivity of lattice oxygen in the oxide phase. The anode containing 5 wt.% Ni possesses the highest amounts of oxygen vacancies and Ce 3+ /Ce 4+ redox pairs that facilitates the charge transfer process, which is one of the rate-determining steps of anode reaction. Consequently, that anode shows the lowest polarization resistance of 0.014 Ω cm 2 at 700 °C, much lower than those of other Ni-based anodes prepared through conventional techniques such as impregnation and solid-mixing. With that anode, a single cell supported by a 480-μm-thick Ce 0.8 Sm 0.2 O 2-δ electrolyte layer exhibits the maximum power density of 270 mW cm −2 at 700 °C. The anode also shows a promising stability.
研究领域:
材料科学
·
电化学
·
能源材料
·
燃料电池
✓ 已验证
DOI
高影响因子
Nature Energy
·
2024
·
IF 49.7
Jie Yulin,Wang Shiyang,Weng Suting,Liu Yue,Yang Ming,Tang Chao,Li Xinpeng,Zhang Zhengfeng,Zhang Yuchen,Chen Yawei,Huang Fanyang,Xu Yaolin,Li Wanxia,Guo Youzhang,He Zixu,Ren Xiaodi,Lu Yuhao,Yang Ke,Cao Saichao,Lin He,Cao Ruiguo,Yan Pengfei,Cheng Tao,Wang Xuefeng,Jiao Shuhong,Xu Dongsheng
The development of practical lithium metal cells is plagued by their limited lifespan, primarily due to the poor interfacial stability of the electrolytes. Here we present a compact ion-pair aggregate (CIPA) electrolyte that enables high-performance Li metal pouch cells under lean electrolyte conditions. The electrolyte features a unique nanometre-scale solvation structure in which ion pairs are densely packed to form large CIPAs, in contrast to conventional electrolytes that comprise small aggregates. Notably, the CIPAs facilitate fast interfacial reduction kinetics on the Li metal anode via a collective electron-transfer process, leading to the formation of a stable interface. A 505.9 Wh kg −1 Li metal pouch cell with a high-nickel-content cathode (LiNi 0.905 Co 0.06 Mn 0.035 O 2 ) exhibited a 91% energy retention after 130 cycles. This work demonstrates nanostructured electrolyte design for realizing high-performance Li metal batteries. It also showcases the importance of understanding interfacial reaction mechanisms in the design and development of electrolytes.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）