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1,018 results on '"Sun, Xuhui"'

4. Research on tripartite evolutionary game and simulation of cold chain food traceability system

Author

Zhang, Yunfeng, Zhang-Sun, Xuhui, Liu, Yang, Qin, PengHui, Li, Kan, Editor-in-Chief, Li, Qingyong, Associate Editor, Fournier-Viger, Philippe, Series Editor, Hong, Wei-Chiang, Series Editor, Liang, Xun, Series Editor, Wang, Long, Series Editor, Xu, Xuesong, Series Editor, Subramaniyam, Kannimuthu, editor, Leng, Lu, editor, Li, Jing, editor, and Wheeb, Ali Hussein, editor

Published
2024
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33. Real-time interface investigation on degradation mechanism of organic light-emitting diode by in-operando X-ray spectroscopies

Author

Nie, Kaiqi, Zhang, Hui, McLeod, John A, Zhang, Duo, Zhou, Dongying, Xia, Yujian, Zhong, Jun, Liao, Liangsheng, Guo, Jinghua, and Sun, Xuhui

Subjects
Engineering, Macromolecular and Materials Chemistry, Materials Engineering, Chemical Sciences, Organic light-emitting diode, In-operando, X-ray absorption spectroscopy, Interface interaction, Degradation mechanism, Physical Sciences, Applied Physics, Chemical sciences, Physical sciences
Abstract

Understanding the chemical evolution at the interface of organic light-emitting diodes (OLEDs) under working conditions is critical for addressing device failure and further improving performance. In this work, an in-operando approach was developed employing synchrotron-based X-ray absorption spectroscopy (XAS) to investigate the electronic structures and chemical degradation mechanisms of a model tris(8-hydroxyquinoline) aluminum (Alq3)-based OLED device under working condition. The results identify that Mg atoms from the electrode migrate into the Alq3 organic layer under a potential bias and replace Al atom sites, forming the unstable Mgq3 species which lead to device degradation. The findings from the classic and simple model device elucidate the degradation mechanisms occurred at the interface of OLED devices, which may facilitate the development of more efficient and stable OLED devices with complex structures.

Published
2020

43. Lithium nitrate: A double-edged sword in the rechargeable lithium-sulfur cell

Author

Ye, Yifan, Song, Min-Kyu, Xu, Yan, Nie, Kaiqi, Liu, Yi-sheng, Feng, Jun, Sun, Xuhui, Cairns, Elton J, Zhang, Yuegang, and Guo, Jinghua

Subjects
Engineering, Materials Engineering, Chemical Sciences, Physical Chemistry, Lithium-sulfur cell, Lithium nitrate, Cathode-electrolyte interface, X-ray absorption spectroscopy, Double-edged sword effect, Chemical Engineering, Electrical and Electronic Engineering
Abstract

Lithium nitrate (LiNO3) has been the most studied electrolyte additive in lithium-sulfur (Li-S) cells, due to its known function of suppressing the shuttle effect in Li-S cells, which provides a significant increase in the cell's coulombic efficiency and cycling stability. Previous studies indicated that LiNO3 participated in the formation of a passive layer on the lithium electrode and thus suppressed the redox shuttle of the dissolved polysulfides. However, the effects of the LiNO3 on the positive electrode materials have rarely been investigated. By combining scanning electron microscopy, element-selective X-ray absorption spectroscopy, and electrochemical characterizations, we performed a comprehensive study of how the LiNO3 altered the properties of the sulfur electrode/electrolyte interface in Li-S cells and thus influenced the cell performance. We found that LiNO3 is a double-edged sword in the Li-S cell: on one hand, it increased the consumption of the active sulfur; on the other hand, it promoted the survival of the carbon matrix constituent in the sulfur electrode. These two competitive effects indicated that a proper moderate concentration of LiNO3 is required to achieve an optimized cell performance.

Published
2019

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