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Your search keyword '"Liu, Yan'gai"' showing total 250 results
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250 results on '"Liu, Yan'gai"'

28. Progress of Prussian Blue and Its Analogues as Cathode Materials for Potassium Ion Batteries.

Author

Bai, Yue, YuChi, Ke'er, Liu, Xu, Tian, Shinuo, Yang, Shujie, Qian, Xi, Ma, Bin, Fang, Minghao, Liu, Yan'gai, Huang, Zhaohui, and Min, Xin

Subjects
PRUSSIAN blue, POTASSIUM ions, ENERGY storage, CATHODES, ENERGY shortages, ENERGY development
Abstract

Environmental pollution and the energy crisis have promoted the development of clean energy as well as new‐generation energy storage systems. Potassium ion batteries (PIBs) have emerged as a possible alternative to lithium‐ion batteries due to their abundant reserves, low cost, and impressive electrochemical performance. However, the search for suitable cathode materials has become particularly crucial. Recently, Prussian blue (PB) has been investigated as a potential cathode material for PIBs, which has an open three‐dimensional framework to accommodate a large volume of potassium ions and adjustable composition for different applications. In this review, Prussian blue and its analogues (PBAs) and their application in PIBs were summarized detailly. We presented the composition, structure, potassium ion storage mechanism, preparation process of PBAs, and then focus on the performance optimization methods of the PBAs, including transition metal doping and conductive material adding into PBAs. Finally, the challenges as well as the outlook on the future development of PBAs were proposed for further application in this battery system. [ABSTRACT FROM AUTHOR]

Published
2023
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50. Energy transfer properties of a single-phase Na3Gd(PO4)2:Eu2+,Mn2+ phosphor with excellent thermal stability for w-LEDs.

Author

Xie, Meiling, Wu, Meihua, Fang, Minghao, Huang, Zhaohui, Liu, Yan'gai, Wu, Xiaowen, and Min, Xin

Subjects
PHOSPHORS, ENERGY transfer, THERMAL stability, LIGHT emitting diodes, TERBIUM, GADOLINIUM, PHOTOLUMINESCENCE measurement, BLUE light
Abstract

A high temperature solid state method was used to prepare Na3Gd(PO4)2:Eu2+,Mn2+ phosphors with good thermal stability. The phosphor shows a broadband excitation region of 250–430 nm, which can be matched with the emissions of ultraviolet (UV)/near-ultraviolet (NUV) LED chips for white light emitting diodes (w-LEDs). The energy transfer efficiency is 74.46% from the sensitizer Eu2+ ions to the activator Mn2+ ions, which enhances the intensities of the Na3Gd(PO4)2-based phosphor. In addition, by increasing the Mn2+ doping level in the phosphor, the Na3Gd(PO4)2:Eu2+,Mn2+ phosphor first shows blue light, then turns to white light, and finally emits red light under 365 nm excitation. Besides, the temperature-dependent photoluminescence measurements indicate that the prepared phosphors exhibit good thermal stability. W-LEDs fabricated by combining a 365 nm chip with the Na3Gd(PO4)2:Eu2+,Mn2+ phosphor exhibit bright white light, which has a high color rendering index (CRI) = 91.5, and a relatively low correlated color temperature (CCT) = 5198 K. Moreover, the CIE point is calculated to be at (0.3337, 0.3465), which is located in the white light region. These results indicate that the as-prepared phosphors can be considered as potential candidates for UV/NUV light-excited w-LED applications. [ABSTRACT FROM AUTHOR]

Published
2022
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