JOURNAL OF POWER SOURCES
·
2024
·
IF 8.1
Zhengwu Wang,Yannan Zhang,Bao Zhang,Dong Yang,Kai Zhou,Yixue Huang,Fei Wang,Jianguo Duan,Xianshu Wang,Peng Dong,Yingjie Zhang
Spinel LiNi 0.5 Mn 1.5 O 4 (LNMO) has gained significant attention as a promising cathode material for lithium-ion batteries due to its high working voltage (>4.7 V) and energy density . However, challenges such as electrolyte decomposition-induced material interface erosion and transition metal dissolution under high operating voltage hinder its commercial use. In this study, a thin and uniform Sm 2 O 3 layer has been successfully deposited on the surface of LNMO using a wet chemical method . A comprehensive investigation of surface morphology , crystal structure, and electrochemical performance of the modified LNMO is conducted. The results demonstrate that the Sm 2 O 3 surface modification acts as a robust multifunctional protective layer, effectively shielding against hydrofluoric acid-induced chemical attack and enhancing the migration efficiency of lithium ions . Notably, the capacity retention rate of LNMO@Sm 2 O 3 (3 wt%) remains up to 88 % after 280 cycles, significantly surpassing the uncoated counterpart. The coated material exhibits a capacity of 114 mAh g −1 even under 10 C rate conditions. Moreover, the AC impedance values and manganese dissolution of the modified material in the organic electrolyte are considerably lower than those of the uncoated counterpart. Theoretical calculations strongly support the experimental findings, revealing higher Mn vacancy formation energy and density of states at the Fermi energy level for the Sm 2 O 3 -modified electrodes. This research contributes to the field of surface modification and paves the way for further enhancements in the electrochemical performance of other high-voltage manganese-based lithium-ion batteries (LIBs).
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
纳米技术
·
表面工程
·
锂电池
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2024
·
IF 3.3
Yougui Yang,Yan Chen,Junhao Li,Ling He,Meng Wu,Qi Wang,Yong Yang,Zhangwen Long,Yuan Gao,Dacheng Zhou,Jianbei Qiu
All-inorganic perovskite quantum dots (QDs) in glass materials , specifically CsPbX 3 (X = Cl, Br, I), are being considered as the next-generation fluorescent materials due to their impressive luminous performance and stability. However, the crystallization process of quantum dots within the glass presents uncontrollable challenge, leading to uneven crystallinity and subsequent reductions in light efficiency, thereby affecting practical applications. In glass ceramics doped with rare-earth oxides , the introduction of rare-earth ions as nucleating agents can promote the self-precipitation of nanocrystalline crystals within the glass. Building upon this principle, we have doped rare-earth ions into borosilicate glass for the first time to induce the self-crystallization of CsPbBr 3 QDs. This approach effectively enhances the equilibrium distribution of quantum dots within the glass, resulting in a significant improvement in luminosity. Furthermore, the luminescence spectrum range of quantum dot-shaped luminescent glass materials can be finely tuned through rare-earth ion doping. This finding holds both theoretical and practical significance for their application in the field of lighting.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Shuang Ou,Zhifeng Huang,Tang Tang,Binhua Xiang,Guangyi Liu,Yizhen Chu,Qinggang Li,Guanchao Yin,Qiang Shen,Fei Chen
AlN ceramics are widely used in integrated circuit thermal management and packaging materials due to their excellent thermal conductivity, insulating properties, and thermal expansion coefficient similar to silicon. However, traditional hot-press sintering processes often struggle to produce homogeneous AlN ceramics that combine high thermal conductivity with excellent flexural strength. Furthermore, different sintering additives used in AlN ceramics have varying effects on their mechanical and thermal properties. Therefore, this study first conduct a preliminary screening of five different sintering additives and select two specific sintering additives for the laminate design. The Sm 2 O 3 additive demonstrates the highest flexural strength while the Y 2 O 3 additive showcases the highest thermal conductivity. Subsequently, laminated AlN ceramics with Sm 2 O 3 additive in the surface and Y 2 O 3 additive in the intermediate layer are fabricated to synergistically improve the strength and thermal conductivity. The laminated AlN ceramic exhibits a thermal conductivity of 150 W m −1 K −1 and a flexural strength of 458 MPa. These improvements are attributed to enhanced fine-grain strengthening coupled with its dense structure and isolated secondary phase distribution. This work provides a feasible strategy for synergistic enhancement of mechanical and thermal properties in AlN Ceramics via laminated distribution of sintering additives.
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Zhehui Zhang,Xiaohua Zhang,Runkang Li,Jie Zhang,Jinyan Zhao,Wei Ren,Zhenxing Yue
Piezocatalysis has emerged as a promising technology for environmental remediation by harnessing mechanical energy to drive redox reactions. In this study, Sm2O3-doped (Ba0.85Ca0.15)(Zr0.1Ti0.9)O3 (BCZT) solid solutions have been synthesized via a facile solid-state reaction to systematically investigate the effects of Sm3+ doping on the phase structure, defect chemistry, and piezocatalytic activity. Rietveld refinement, transmission electron microscopy, and Raman spectroscopy all confirm the coexistence of rhombohedral, orthorhombic, and tetragonal phases. The morphotropic phase boundary (MPB) promotes polarization rotation and enhances the piezoelectric response. The thermally stimulated depolarization current (TSDC) measurements reveal that the lowest defect (particularly oxygen vacancy) density is found in the BCZT samples doped with 0.02 wt % Sm2O3, which enable the materials to possess exceptional piezocatalytic performance, yielding a high degradation efficiency (96.8%) of rhodamine B within 30 min at a rate constant of 0.1156 min–1. Carrier separation and migration capabilities have been boosted through electrochemical and band structure analyses. This work indicates that Sm2O3 doping introduces local structural heterogeneity and optimizes the defect state for the host materials, providing an effective strategy for designing high-performance eco-friendly piezocatalysts.
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产品关联
DOI
PubMed
高影响因子
Catalysts
·
2019
·Vol. 9
·期 9
·724
·
IF 3.444
Yan Cui,Leilei Xu,Mindong Chen,Chufei Lv,Xinbo Lian,Cai-e Wu,Bo Yang,Zhichao Miao,Fagen Wang,Xun Hu
CuO-based catalysts are usually used for CO oxidation owing to their low cost and excellent catalytic activities. In this study, a series of metal oxide (La2O3, Fe2O3, PrO2, Sm2O3, and MnO2)-doped CuO-based catalysts with mesoporous Ce0.8Zr0.2O2support were simply prepared by the incipient impregnation method and used directly as catalysts for CO catalytic oxidation. These mesoporous catalysts were systematically characterized by X-ray powder diffraction (XRD), N2physisorption, transmission electron microscopy (TEM), energy-dispersed spectroscopy (EDS) mapping, X-ray photoelectron spectroscopy (XPS), and H2temperature programmed reduction (H2-TPR). It was found that the CuO and the dopants were highly dispersed among the mesoporous framework via the incipient impregnation method, and the strong metal framework interaction had been formed. The effects of the types of the dopants and the loading amounts of the dopants on the low-temperature catalytic performances were carefully studied. It was concluded that doped transition metal oxides could regulate the oxygen mobility and reduction ability of catalysts, further improving the catalytic activity. It was also found that the high dispersion of rare earth metal oxides (PrO2, Sm2O3) was able to prevent the thermal sintering and aggregation of CuO-based catalysts during the process of calcination. In addition, their presence also evidently improved the reducibility and significantly reduced the particle size of the CuO active sites for CO oxidation. The results demonstrated that the 15CuO-3Fe2O3/M-Ce80Zr20 catalyst with 3 wt. % of Fe2O3showed the best low-temperature catalytic activity toward CO oxidation. Overall, the present Fe2O3-doped CuO-based catalysts with mesoporous nanocrystalline Ce0.8Zr0.2O2solid solution as support were considered a promising series of catalysts for low-temperature CO oxidation.Keywords:CuO-based catalyst;Fe2O3dopant;mesoporous Ce0.8Zr0.2O2solid solution;low-temperature catalytic activity;CO oxidation
研究领域:
催化化学
·
材料科学
✓ 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）