CERAMICS INTERNATIONAL
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2025
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IF 5.6
Ke Song,Liyan Xue,Minzhong Huang,Kaixian Wang,Zhiyi Wang,Haiying Xin,Fan Yang,Fengzhi Tan,Heng Chen
The development of multifunctional protective materials with electromagnetic wave absorption and (n, γ) radiation shielding properties is urgently required to guarantee secure functioning of space nuclear power sources. In this work, the multicomponent perovskite ferrites (Ca 0.2 Nd 0.2 Gd 0.2 Yb 0.2 Bi 0.2 )FeO 3 (RE-1), (Ca 0.2 Nd 0.2 Gd 0.2 Ho 0.2 Bi 0.2 )FeO 3 (RE-2), and (Ca 0.2 Nd 0.2 Gd 0.2 Ho 0.2 Bi 0.2 ) (Fe 0.9 Ti 0.1 )O 3 (RE-3) were prepared by the sol-gel method. Through multicomponent regulation, the dipole polarization and interfacial electronic transitions can be affected by the lattice distortion effect, which enhances the electromagnetic wave absorption characteristics. With an effective absorption bandwidth of 2.92 GHz and a minimum reflection loss of −46.94 dB, RE-3 exhibits the most efficient electromagnetic wave absorption of the three manufactured samples. Regarding the shielding of neutrons, the shielding efficiency of the RE-3 (45 wt%)-polypropylene (RE-3/PP 3 ) reached 99.78 %, which is mainly due to the large neutron absorption cross section of the rare-earth element Gd. With respect to the γ-ray protection capabilities, the lead equivalent values for the RE-3/PP 3 composites are 0.5083 mmPb at a 65 keV energy when narrow-band filtered X-rays are used and 1.1977 mmPb at a 1250 keV energy when a 60 Co gamma source is used. These findings indicate that multicomponent regulation can enhance the Compton effect by altering the valence electron coverage space and that rare-earth elements significantly improve the γ-ray shielding effectiveness of a material in the weak absorption region of lead. In this work, the integration of electromagnetic wave absorption and (n, γ) radiation shielding properties was achieved by multicomponent regulation, which provides a novel tactic for the developing multifunctional protective materials used in the field of deep space exploration.
研究领域:
材料科学
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核物理学
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电磁学
✓ 已验证
产品关联
DOI
高影响因子
ACS Nano
·
2024
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IF 15.8
Zhiqiang Hao,Xiaoyan Shi,Wenqing Zhu,Zhuo Yang,Xunzhu Zhou,Chenchen Wang,Lin Li,Weibo Hua,Chang-Qi Ma,Shulei Chou
Na3V2(PO4)3 (NVP) based on the multielectron reactions between V2+ and V5+ has been considered a promising cathode for sodium-ion batteries (SIBs). However, it still suffers from unsatisfactory stability, caused by the poor reversibility of the V5+/V4+ redox couple and structure evolution. Herein, we propos a strategy that combines high-entropy substitution and electrolyte optimization to boost the reversible multielectron reactions of NVP. The high reversibility of the V5+/V4+ redox couple and crystalline structure evolution are disclosed by in situ X-ray absorption near-edge structure spectra and in situ X-ray diffraction. Meanwhile, the electrochemical reaction kinetics of high-entropy substitution NVP (HE-NVP) can be further improved in the diglyme-based electrolyte. These enable HE-NVP to deliver a superior electrochemical performance (capacity retention of 93.1% after 2000 cycles; a large reversible capacity of 120 mAh g–1 even at 5.0 A g–1). Besides, the long cycle life and high power density of the HE-NVP∥natural graphite full-cell configuration demonstrated the superiority of HE-NVP cathode in SIBs. This work highlights that the synergism of high-entropy substitution and electrolyte optimization is a powerful strategy to enhance the sodium-storage performance of polyanionic cathodes for SIBs.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MEASUREMENT
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2024
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IF 5.2
Yanyan Wang,Kaikai Zhang,Shengzhe Shi,Qingqing Wang,Chun Wang,Sheng Liu
To better utilize the spectral features of near-infrared and visible light and address issues in traditional suspension particle size detection, such as long measurement cycles, high costs, and complex operation, we propose a new method that combines multispectral sensor characterization technology with machine learning algorithms for rapid particle size measurement. By integrating a lab-designed light source driving circuit and spectral data acquisition device, we obtained 15 spectral data points for visible light, near-infrared, and red–blue–green (RGB) values to build a prediction model. The near-infrared-based model obtained a coefficient of determination (R 2 ) of 0.9130, whereas models combining RGB-near-infrared and visible-near-infrared features performed best, with R 2 values of 0.9670 and 0.9845. These models improved performance by 5.91% and 7.83%, effectively overcoming the limitations of single spectral features in different suspensions. This combination of visible and near-infrared light with machine learning proves effective for detecting average particle size in suspensions.
研究领域:
光学检测
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机器学习应用
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2022
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IF 9.794
Chunhui Wang,Shuangshuang Zhao,Wei Shen,Xiaoming Xi,Lishan Yang,Lixiong Bai,Yahui Yang,Chenghuan Huang,Jian Zhu,Youyuan Zhou,Yitai Qian,Zhongliang Tian,Yanqing Lai,Liqiang Xu
Layered high-temperature LiCoO 2 (HT-LiCoO 2 ), a mature commercial cathode for 3C electronic devices, has been unable to satisfy the new and ever-growing battery demands due to its high price and the structural instability at high temperature or high voltage conditions. The practical strategies mainly conclude introducing even dopants and functional modifications to LiCoO 2 crystals, but lacking explorations on the precise-control of non-equilibrium intermediates and preferred crystal planes during the solid-solid-gas (SSG) synthesis process. Here, the structure-optimal HT-LiCoO 2 micro-bricks are synthesized via coherent pyrolysis followed by a SSG reaction from Co–Al-mixed oxalate precursors, forming layered phase, ideal crystal morphology and uniformly distributed Al-dopants. In particular, we observe both of the phase progression and morphology evolution during the synthesis process of LiCo 1-x Al x O 2 micro-bricks. Integrating the superiorities of the nanosized intermediates and Al-doping regulation, smaller crystalline size and less salt-rock defects are realized in the target cathodes, ultimately achieving promoted Li + diffusion kinetic and electrochemical stability. Combined with the theory calculation, the optimized LiCo 1-x Al x O 2 with possible ion channels and the dopant-affected band gap have been simulated. These insights can help to guide the SSG synthesis of layered cathode materials with preferential orientations, precise doping and tailored phase compositions .
研究领域:
材料科学
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电化学
✓ 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）