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1,482 results on '"Xu, Yunhua"'

159. Anisotropic carbon matrix derived from cellulose aerogel decorated wood plate serving as self- supporting hosts for cathodes in lithium sulfur batteries with enhanced cycling stability

Author

Yan, Yinglin, primary, Zhang, Xingsheng, additional, Jing, Wei, additional, Liu, Pufang, additional, Song, Muze, additional, Fan, Chaojiang, additional, Xu, Rongfu, additional, Zou, Yiming, additional, Deng, Qijiu, additional, Wang, Xianhui, additional, Zhong, Lisheng, additional, Yang, Rong, additional, and Xu, Yunhua, additional

Published
2023
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166. Effect of oxygen vacancies injection on the resistance switching properties of Hf0.5Zr0.5O2.

Author

Liu, Jianbo, Li, Xiaohui, Li, Xiaola, Bai, Jing, and Xu, Yunhua

Abstract

The regulation of oxygen vacancies (Vo) concentration has become an important research direction for further improving the resistance switching (RS) performance of materials and developing RS memory devices. In this study, the Pt/Hf0.05Zr0.05O2/LaNiO3 (Pt/HZO/LNO) structure is prepared via a sol-gel method using LNO as the oxide electrode and Vo reservoir layer. Pt/HZO/Pt and Pt/HZO/LiNbO3(LN)/LNO structures are also prepared as a comparison. The current density-voltage (J-V) characteristics and RS effects of these materials are presented in detail. Both the Pt/HZO/Pt and Pt/HZO/LNO structures demonstrate obvious RS effect, and their RS mechanisms can be attributed to the formation of a Vo conductive-filament (CF) channel. However, in the Pt/HZO/LNO structure, Vo originate from two mechanisms under different negative voltages, i.e., from the HZO itself and through injection into HZO from LNO, resulting in its RS characteristics being different from the Pt/HZO/Pt structure. Excessive Vo injected into HZO from the LNO layer leads to a further decrease in the resistance of the Pt/HZO/LNO structure under a negative electric field. Moreover, there is no significant RS effect in the Pt/HZO/LN/LNO structure because it is difficult to form CF channel in the LN film. Highlights: The Hf0.5Zr0.5O2(HZO) film and HZO/LaNiO3 hetero-structures were prepared via sol-gel method. The influence of metal and oxide electrodes on the resistance switching (RS) effect was investigated. Oxygen vacancies (Vo) originate from two mechanisms due to the use of oxide electrodes. [ABSTRACT FROM AUTHOR]

Published
2024
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167. Nonisothermal and Isothermal Hydrogen Storage Behaviors of MgH2‐Based Composites Catalyzed by Carbon Isomeric Catalysts: Lightweight and Efficient Catalysis to Achieve High Capacity of Hydrogen Storage.

Author

Yun, Hui, Wang, Haiyan, Bai, Jing, Wang, Xuesong, Dai, Xiaomin, Hou, Xiaojiang, and Xu, Yunhua

Subjects
HYDROGEN storage, CARBON composites, CATALYSTS, CATALYSIS, SIZE reduction of materials, CARBON nanotubes, MECHANICAL alloying
Abstract

MgH2‐based composites are prepared by high‐energy ball milling surface catalysis with carbon isomeric catalysts to explore isothermal and nonisothermal H2 storage behavior. The reduction particle size and catalysts are conducive to absorption/desorption. The release peak temperatures of MgH2 catalyzed by activated carbon (AC), carbon nanotubes (CNTs), reduced graphene oxide (rGO), and expanded graphite (EG) are 445, 424, 458, and 446 °C, lower than that of MgH2 (≈463 °C). The hydrogenation capacities for the 3rd cycle of MgH2, MgH2–AC, MgH2–CNTs, and MgH2–EG are 3.35, 6.52, 6.66, and 6.92 wt%, corresponding to 47%, 90%, 92%, and 96% conversion rates. The dehydrogenation capacities increase to 5.86, 4.94, 3.18, and 5.74 wt% of MgH2–AC, MgH2–CNTs, MgH2–rGO, and MgH2–EG within 0.5 h, higher than MgH2 (2.29 wt%). The final dehydrogenation capacities of MgH2, MgH2–AC, MgH2–CNTs, MgH2–rGO, and MgH2–EG are 2.84, 6.69, 5.14, 3.65, and 6.61 wt%. The absorption capacities of MgH2, MgH2–AC, MgH2–CNTs, MgH2–rGO, and MgH2–EG within 0.5 h are 2.42, 6.47, 6.21, 3.03, and 4.20 wt%, and the final hydrogenation capacities reach 2.58, 6.65, 6.33, 3.10, and 4.34 wt%. The initial kinetics and the final degrees of absorption/desorption of MgH2 are elevated by carbon isomeric catalysts. [ABSTRACT FROM AUTHOR]

Published
2024
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189. Low‐Cost, Safe, and Ultra‐Long Cycle Life Zn–K Hybrid Ion Batteries.

Author

Zhan, Jialu, Zhu, Wei, Liu, Yuansheng, Li, Mengjie, Zhao, Jiwei, Su, Hai, Ding, Jia, Sun, Jie, and Xu, Yunhua

Subjects
LITHIUM-ion batteries, ENERGY storage, ZINC ions, ELECTRIC batteries, PRUSSIAN blue, RAW materials, DENDRITIC crystals, STORAGE batteries
Abstract

Zinc‐ion batteries (ZIBs) are viewed as a promising energy storage system for large‐scale applications thanks to the low cost and wide accessibility of Zn‐based materials, the high theoretical capacity of Zn anode, and their high level of safety. However, the practical application of ZIBs is hindered by the rapid performance degradation. Herein, a Zn–K hybrid ion battery design is proposed using a high‐quality Prussian blue cathode and a nonflammable Zn–K hybrid ion electrolyte. The electrochemical process is divided into two parts, with K+ insertion/extraction occurring at the cathode side and Zn2+ plating/stripping occurring at the anode side, which avoids structure destruction caused by Zn2+ insertion in the cathode. The non‐flammable electrolyte not only ensures high safety but also effectively suppresses dendrite growth on the Zn anode. The hybrid cells demonstrate a high capacity of 151.0 mAh g−1, a high voltage of 1.74 V (vs Zn2+/Zn), and an ultra‐long cycle life of 15 000 cycles. Combining the nonflammable nature of the electrolyte, the abundance of raw materials, and good electrochemical performance, the Zn–K hybrid ion battery system promises a promising future for renewable energy storage applications. [ABSTRACT FROM AUTHOR]

Published
2023
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191. Electrolytes in Organic Batteries

Author

Li, Mengjie, primary, Hicks, Robert Paul, additional, Chen, Zifeng, additional, Luo, Chao, additional, Guo, Juchen, additional, Wang, Chunsheng, additional, and Xu, Yunhua, additional

Published
2023
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192. Double-Cable Conjugated Polymers Based on Simple Non-Fused Electron Acceptors for Single-Component Organic Solar Cells

Author

Liu, Baiqiao, primary, Liang, Shijie, additional, Karuthedath, Safakath, additional, He, Yakun, additional, Wang, Jing, additional, Tan, Wen Liang, additional, Li, Hao, additional, Xu, Yunhua, additional, Laquai, Frédéric, additional, Brabec, Christoph J., additional, McNeill, Christopher R., additional, Xiao, Chengyi, additional, Tang, Zheng, additional, Hou, Jianhui, additional, Yang, Fan, additional, and Li, Weiwei, additional

Published
2023
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200. Random Double-Cable Conjugated Polymers with Controlled Acceptor Contents for Single-Component Organic Solar Cells

Author

Liu, Baiqiao, primary, Liang, Shijie, additional, Karuthedath, Safakath, additional, Xiao, Chengyi, additional, Wang, Jing, additional, Tan, Wen Liang, additional, Li, Ruonan, additional, Li, Hao, additional, Hou, Jianhui, additional, Tang, Zheng, additional, Laquai, Frédéric, additional, McNeill, Christopher R., additional, Xu, Yunhua, additional, and Li, Weiwei, additional

Published
2023
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