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5 results on '"Wang, Yusijia"'

3. Altered S–S Coulomb Interactions in Polysulfides Associated with VS2/S Nanocomposite Electrodes for Na–S Batteries.

Author

Huang, Jianfeng, Wang, Yiting, Wang, Yusijia, Wei, Shiying, Huang, Qingqing, Bai, Shuzhuo, Wang, Fangmin, Liu, Yijun, Li, Zhenjiang, Chen, Guanjun, Cao, Liyun, and Li, Jiayin

Abstract

Despite the abundant reserves and high theoretical capacity of Na–S batteries, it is still limited by the sluggish reaction kinetics of polysulfides during ultrafast charging and discharging to provide stable and high sodium-ion storage performance. Herein, a catalytic strategy is proposed to change the direction of the Coulomb interaction of S–S bonds to achieve high rate reaction kinetics in polysulfides. In this strategy, a NaxVS2 structure is constructed in VS2/S nanocomposite electrodes to support S for superior performance (784 mA h/g at 0.1 A/g and 512 mA h/g at 10 A/g) during sodium storage process. The electrode can still exhibit stable cycling performance at a very high current density (5000 cycles at 20 A/g). The Na-inserted VS2 (NaxVS2) changes the charge distribution of S in polysulfide molecules, altering the Coulomb interaction between S atoms in polysulfide to form repulsion-induced breaking of S–S bond. This altering effect on the atomic Coulomb interaction is essential to promoting the conversion reaction of polysulfides. The above strategy of changing the Coulomb interaction between S atoms not only provides a reference for the design of nanostructures for electrochemical processes with multistep reactions but also inspires angles and ideas for realizing high-performance Na–S batteries. [ABSTRACT FROM AUTHOR]

Published
2024
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4. Binding Molybdenum selenide with dual conductive carbon as Self-Supporting anode for an efficient sodium storage

Author

Luo Xiaomin, Yunfei Hu, Wang Yusijia, Jiayin Li, Jianfeng Huang, Koji Kajiyoshi, Liyun Cao, Guo Penghui, and Xu Peiguang

Subjects
Materials science, General Physics and Astronomy, chemistry.chemical_element, Surfaces and Interfaces, General Chemistry, Conductivity, Condensed Matter Physics, Surfaces, Coatings and Films, Anode, law.invention, chemistry.chemical_compound, chemistry, Chemical engineering, law, Molybdenum, Selenide, Electrode, Calcination, Carbon, Electrical conductor
Abstract

Compounding with conductive carbon is usually an effective strategy to improve the conductivity of TMDCs and alleviate volume expansion. However, single carbon matrix modification may lead to shedding of the electrode material. In this work, a self-supporting electrode structure is proposed that has MoSe2 as the TMDC sandwiched between the carbon cloth(CC) core and the outer carbon layer to form C-C/MoSe2/CC frame. The dual conductive carbon structure not only can suppress volume expansion, but also can form long-range conductive network. The outer carbon layer can provide short-range electron transfer paths, prevent the active materials from falling off, improve the cycling stability. The unique freestanding structure was synthesized via a multi-step solvothermal and calcination approach. With the above advantages, the C-C/MoSe2/CC heterostructure delivers remarkable cycling stability. In detail, a capacity of 355 mAh g−1 was obtained after 700 cycles at 1 A g−1 as the anode of SIBs. The Kinetic results show that most of the Na+ storage in C-C/MoSe2/CC is governed by a pseudocapacitive process.

Published
2021

5. Preparation and antioxidation properties of glass/yttrium silicates/SiC multilayer coating in both air and combustion atmosphere

Author

Jian Feng Huang, Xin-bo Xiong, L. Y. Cao, Xie Rong Zeng, and Wang Yusijia

Subjects
Materials science, Borosilicate glass, chemistry.chemical_element, Surfaces and Interfaces, Yttrium, engineering.material, Condensed Matter Physics, Microstructure, Hydrothermal circulation, Surfaces, Coatings and Films, Electrophoretic deposition, chemistry, Coating, Materials Chemistry, engineering, Composite material, Layer (electronics), Diffractometer
Abstract

Yttrium silicate coating for SiC precoated C/C composite was prepared by a hydrothermal electrophoretic deposition process. The yttrium silicate coating was sealed with a borosilicate glass outer layer. Phase compositions, surface and cross-section microstructures of the as prepared multilayer coatings were characterised by X-ray diffractometer and scanning electron microscopy. The influences of hydrothermal electrophoretic deposition factors on the phase, microstructure and oxidation resistance of the multilayer coated C/C composites were particularly investigated. Results show that the hydrothermal electrophoretic resulting coating is composed of crystallites with a main phase of Y2Si2O7 and Y2SiO5. The thickness and density of the coatings are improved with the increase in deposition voltage and hydrothermal temperature. Compared with the pack cementation SiC monolayer coating, the as prepared multilayer coatings exhibit better antioxidation property. When oxidation in air and combustion atmosp...

Published
2012

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