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438 results on '"Liu, Yan-gai"'

24. Study of MOF‐derived Double Hemispherical Nano‐Co3O4/C Composite as Anode Material for Lithium‐Ion Batteries.

Author

Wu, Liming, Liu, Yan‐gai, Zhao, Hang, Zhang, Yujie, Wang, Zekun, Zhang, Xi, Zhu, Bing, He, Peijie, and Liu, Yicen

Subjects
*COMPOSITE materials, *LITHIUM-ion batteries, *CARBON-based materials, *ELECTRODES, *METAL-organic frameworks
Abstract

Co3O4 emerges as a promising substitute in the field of anode electrode materials for the next‐generation of lithium‐ion batteries (LIBs). Nevertheless, challenges such as volumetric effects during cycling and insufficient conductivity have resulted in its subpar cycle stability, which impedes its practical application. In this study, we successfully employed a straightforward method to design and synthesize double hemispherical nano‐Co3O4/C composite materials derived from MOF‐74(Co). Benefiting from its nano‐porous structure combined with carbon materials, the resulting Co3O4/C electrode manifests outstanding electrochemical performance. Specifically, the obtained Co3O4/C electrode exhibits a notably high reversible cycle capacity (1151.9 mAh g−1 at 0.2 A g−1), exemplary rate capability, and outstanding long‐cycle performance (maintaining a capacity of 366.2 mAh g−1 at 1 A g−1 after 1400 cycles). This research introduces a novel approach for the development of innovative anode materials for LIBs. [ABSTRACT FROM AUTHOR]

Published
2024
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36. Multi-site occupancies and dependent photoluminescence of Ca9Mg1.5(PO4)7:Eu2+phosphors: A bifunctional platform for optical thermometer and plant growth lighting

Author

Mi, Ruiyu, Liu, Yan-gai, Mei, Lefu, Huang, Zhaohui, Fang, Minghao, Wu, Xiaowen, and Min, Xin

Abstract

Herein, we demonstrate an optical thermometer based on single Eu2+doped Ca9Mg1.5(PO4)7phosphors, which were prepared by traditional solid-state reaction technique under a reduction atmosphere. Considerations on the bond length obtained by the crystal structure refinement and the dependent photoluminescence performances allow to assign the two distinct emission bands to Eu2+ions occupied Ca1–Ca3 and Mg2 sites. Moreover, the blue and red emitting bands perfectly match with the photosynthetic action spectrum, which can enhance the indoor plant photosynthesis. The optimal doping content of Eu2+ions in this Ca9Mg1.5(PO4)7system is 3 mol%. The corresponding concentration quenching effect is verified as dipole–dipole interaction with the critical distance of 3.315 nm. Furthermore, by exploiting the fluorescence intensity technique, the optical thermal resistance properties of Ca9Mg1.5(PO4)7:Eu2+are identified based on the temperature dependent emission spectra in a range of 303–523 K. In detail, the maximum absolute and relative sensitivity Saand Srof Ca9Mg1.5(PO4)7:Eu2+thermometer are as high as 0.637%/K and 0.3155 K–1, respectively. Consequently, the Eu2+doped Ca9Mg1.5(PO4)7phosphors establish a bifunctional platform for both optical thermometer and plant growth lighting via multi-site occupancies.

Published
2023
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