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789 results on '"Meng, Yuezhong"'

103. New potential substitute of PVDF binder: poly(propylene carbonate) for solvent-free manufacturing high-loading cathodes of LiFePO4|Li batteries.

Author

Zhang, Zhe, Han, Dongmei, Xiao, Min, Wang, Shuanjin, Feng, Yuhong, Huang, Sheng, and Meng, Yuezhong

Abstract

For decades, the slurry coating has been used to manufacture lithium-ion battery electrodes. The process involves toxic and expensive organic solvents, followed by time- and energy-consuming vacuum drying. Herein, a solvent-free method for LiFePO4 cathode preparation using lithium-ion conductive and biodegradable poly(propylene carbonate) (PPC) as a binder is proposed. The cathode is prepared by simple ball milling and hot-pressing method. PPC with a glass transition temperature of 36.5 ℃ is processed at a rubbery state and PPC work as a binder at glassy state while battery running. Microscopically, amorphous PPC contains more polar carbonate groups that coordinate lithium ion at a medium strength to absorb and desorb lithium-ion, which is good for lithium-ion migration. PPC with good mechanical strength as the binder and artificial cathode electrolyte interface in LiFePO4 cathode reduces the internal resistance of the battery effectively and protects LiFePO4 from deformation, realizing the remarkable improvement of electrochemical performance of battery. The mass loading for the LiFePO4 cathode with PPC binder is up to 20 mg/cm2 and the initial discharge capacity of LiFePO4|Li batteries reach 141.9 mAh/g at 0.5 C, and the capacity retention is 79.1% after 800 cycles. Replacing high-cost and environment-polluting PVDF with low-cost and environment-friendly PPC, this solvent-free method will largely reduce the cost and emission of the lithium-ion battery industry. [ABSTRACT FROM AUTHOR]

Published
2023
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104. Gold nanoparticles immobilized on single-layer α-zirconium phosphate nanosheets as a highly effective heterogeneous catalyst

Author

Zhou, Yingjie, Ding, Hao, Liu, Jingjing, LaChance, Anna, Xiao, Min, Meng, Yuezhong, and Sun, Luyi

Abstract

Gold nanoparticles (Au NPs) were immobilized on single-layered α-zirconium phosphate (ZrP) nanosheets as a highly efficient heterogeneous catalyst. The nanoparticles were characterized by thermogravimetric analysis (TGA), X-ray diffraction (XRD), X-ray photoelectric spectroscopy (XPS), UV–Vis spectroscopy, scanning electron microscopy (SEM), and transmission electron microscopy (TEM) techniques. The characterizations showed that the Au NPs with a size distribution of 2.0 ± 1.0 nm were uniformly dispersed and immobilized on single-layer ZrP nanosheets. The supported AuNPs could serve as an effective catalyst for the reduction of 4-nitrophenol by sodium borohydride (NaBH4). Graphical abstract.

Published
2024
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105. Simulation on Interplay Between Morphological Evolution and Defect in Polycrystalline TSV During EM

Author

Zeng, Xin, Huang, Zhiheng, Wang, Shuanjin, Xiao, Min, Meng, Yuezhong, and Liu, Yang

Abstract

Through-silicon vias (TSVs) have now enabled a variety of state-of-the-art 3-D packaged microelectronic devices. Nevertheless, electromigration (EM) can induce local damages and eventually lead to open-circuit failures (OCFs) inside the Cu-TSVs. Here, a phase field (PF) model is developed to conduct a systematic and detailed study on the interplay between morphological evolution and defects in polycrystalline TSVs during EM. A decisive contribution from the alignment between grain boundaries (GBs) and the EM-induced flux is identified by analyzing three local fluxes and their net sum, i.e., the total flux. Four types of local damages can be classified according to the distribution of the total flux in the grain structure where the damages initiate. TSV models with complex and close-to-real grain structures show that the time to OCF in TSVs with a combined bamboo-like and poly-cluster (PC) structure is about 30% shorter than the counterpart with a combined columnar and PC structure. In addition, both voids and second phase particles (SPPs) can delay the OCF in TSVs under the GB dominant diffusion mechanism. Under the interfacial dominant diffusion mode, however, voids are found to significantly accelerate the OCF.

Published
2024
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112. One-Step Electrochemical Dealloying of 3D Bi-Continuous Micro-Nanoporous Bismuth Electrodes and CO 2 RR Performance.

Author

Lai, Wenqin, Liu, Yating, Zeng, Mingming, Han, Dongmei, Xiao, Min, Wang, Shuanjin, Ren, Shan, and Meng, Yuezhong

Subjects
CARBON dioxide, BISMUTH, ELECTROLYTIC reduction, CARBON dioxide reduction, BINARY metallic systems, NANOPOROUS materials
Abstract

The rapid development of electrochemical CO2 reduction offers a promising route to convert intermittent renewable energy into products of high value-added fuels or chemical feedstocks. However, low faradaic efficiency, low current density, and a narrow potential range still limit the large-scale application of CO2RR electrocatalysts. Herein, monolith 3D bi-continuous nanoporous bismuth (np-Bi) electrodes are fabricated via a simple one-step electrochemical dealloying strategy from Pb-Bi binary alloy. The unique bi-continuous porous structure ensures highly effective charge transfer; meanwhile, the controllable millimeter-sized geometric porous structure enables easy catalyst adjustment to expose highly suitable surface curvatures with abundant reactive sites. This results in a high selectivity of 92.6% and superior potential window (400 mV, selectivity > 88%) for the electrochemical reduction of carbon dioxide to formate. Our scalable strategy provides a feasible pathway for mass-producing high-performance and versatile CO2 electrocatalysts. [ABSTRACT FROM AUTHOR]

Published
2023
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148. Perhydropolysilazane-derived-SiOx coated cellulose: a transparent biodegradable material with high gas barrier property.

Author

Yue, Shuangshuang, Wang, Shuanjin, Han, Dongmei, Huang, Sheng, Xiao, Min, and Meng, Yuezhong

Subjects
BIODEGRADABLE materials, CELLULOSE, SANDWICH construction (Materials), VAPOR barriers, WATER vapor, OXYGEN in water
Abstract

A transparent perhydropolysilazane-derived-SiOx coated cellulose film with high gas barrier properties was fabricated via a facile solution dip-coating followed by UV curing method. The conversion of perhydropolysilazane to SiOx was proved by ATR-FTIR, XPS and TOF–SIMS characterizations. AFM and SEM images revealed the smoothness of the coating and good adhesion between the cellulose substrate and the coating. The thickness of the SiOx coating (50–450 nm) can be tuned by changing the concentration of the perhydropolysilazane precursor solution. The cellulose film (35 µm in thickness) with 450 nm thick SiOx coating exhibits low oxygen transmission rate (OTR) value of 0.82 cm3/m2·day and water vapor transmission rate (WVTR) value of 1.28 g/m2·day. The excellent oxygen and water vapor barrier properties, ultrahigh transparency and complete biodegradability of the SiOx coated cellulose film endow it competitive potential for packaging applications. A transparent perhydropolysilazane-derived-SiOx layer is tightly coated on a cellulose film via a facile solution dip-coating followed by UV curing method. The sandwich structured cellulose-SiOx films show excellent oxygen and water vapor barrier properties as well as ultrahigh transparency and complete biodegradability, which has a great potential for food, medicine and other packaging applications. [ABSTRACT FROM AUTHOR]

Published
2022
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150. A Robust PtNi Nanoframe/N-Doped Graphene Aerogel Electrocatalyst with Both High Activity and Stability

Author

Yang, Jing, Hübner, René, Zhang, Jiangwei, Wan, Hao, Zheng, Yuanyuan, Wang, Honglei, Qi, Haoyuan, He, Lanqi, Li, Yi, Dubale, Amare Aregahegn, Sun, Yujing, Liu, Yuting, Peng, Daoling, Meng, Yuezhong, Zheng, Zhikun, Rossmeisl, Jan, Liu, Wei, Yang, Jing, Hübner, René, Zhang, Jiangwei, Wan, Hao, Zheng, Yuanyuan, Wang, Honglei, Qi, Haoyuan, He, Lanqi, Li, Yi, Dubale, Amare Aregahegn, Sun, Yujing, Liu, Yuting, Peng, Daoling, Meng, Yuezhong, Zheng, Zhikun, Rossmeisl, Jan, and Liu, Wei

Abstract

Insufficient catalytic activity and stability and high cost are the barriers for Pt-based electrocatalysts in wide practical applications. Herein, a hierarchically porous PtNi nanoframe/N-doped graphene aerogel (PtNiNF-NGA) electrocatalyst with outstanding performance toward methanol oxidation reaction (MOR) in acid electrolyte has been developed via facile tert-butanol-assisted structure reconfiguration. The ensemble of high-alloying-degree-modulated electronic structure and correspondingly the optimum MOR reaction pathway, the structure superiorities of hierarchical porosity, thin edges, Pt-rich corners, and the anchoring effect of the NGA, endow the PtNiNF-NGA with both prominent electrocatalytic activity and stability. The mass and specific activity (1647 mA mgPt−1, 3.8 mA cm−2) of the PtNiNF-NGA are 5.8 and 7.8 times higher than those of commercial Pt/C. It exhibits exceptional stability under a 5-hour chronoamperometry test and 2200-cycle cyclic voltammetry scanning.

Published
2021

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