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205 results on '"Gao, Daowei"'

20. Ultra‐Narrow Alkane Product Distribution in Polyethylene Waste Hydrocracking by Zeolite Micro‐Mesopore Diffusion Optimization.

Author

Wang, Shuai, Wang, Weichen, Chu, Mingyu, Gao, Daowei, Wang, Yong, Lv, Yipin, Wang, Rongyao, Song, Lianghao, Zhao, Huaiqing, Chen, Jinxing, and Chen, Guozhu

Abstract

Plastic pollution poses a pressing environmental challenge in modern society. Chemical catalytic conversion has emerged as a promising solution for upgrading waste plastics into valuable liquid alkanes and other high value products. However, the current methods yield mixed products with a wide carbon distribution. To address this challenge, we present a bifunctional catalytic system consisting of β zeolite mixed hierarchical Pt@Hie‐TS‐1, designed for the conversion of low‐density polyethylene (LDPE) into liquid alkanes. This system achieves a 94.0 % yield of liquid alkane, with 84.8 % of C5−C7 light alkanes. Combined with in situ FTIR and molecular dynamics simulation, the shape‐selective mechanisms is elucidated, which ensures that only olefins of the appropriate size can diffuse to the encapsulated Pt sites within the zeolite for hydrogenation, resulting in an ultra‐narrow product distribution. Furthermore, by optimizing the micro‐mesopores of Pt@Hie‐TS‐1, the scaling relationship between the pore structure and the conversion/selectivity is identified. The rapid diffusion of olefins within these micro‐mesopores significantly enhances the catalytic efficiency. Our findings contribute to the design of efficient catalysts for plastic waste valorization. [ABSTRACT FROM AUTHOR]

Published
2024
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23. Analysis of Motor Functions of Hemiplegic Patients Based on Dual-Mode Signal Fusion

Author

Qin, Sichao, Gao, Daowei, Chen, Xi, Ning, Shuangqian, Liu, Zhonghua, and Li, Pengfei

Abstract

Accurate assessment of mobility is of great significance for disease diagnosis and rehabilitation guidance. In response to the needs of hemiplegic patients (HPs) for accurate quantitative assessment of mobility during disease diagnosis and rehabilitation, this article proposes a gait analysis method based on the fusion of bimodal gait signals from human electrostatic field and Kinect, which can objectively and quantitatively assess the gait abnormalities of HPs. Kinematic data and human electrostatic gait signals were recorded simultaneously during the walking process of the subjects, and ten quantitative indexes of motion ability and symmetry of hip, knee, and ankle joint, muscle force control ability, gait symmetry, gait balance, and gait stability were extracted. The gait index of HPs was quantitatively assessed by an improved principal component analysis method, which was used to quantitatively assess the lower limb motor function of HPs. The results showed that the hemiplegic gait index was effective in differentiating HPs with different Brunnstrom stages and showed a significant negative correlation with the Fugl-Meyer lower extremity motor function scale scores ( ${P} \lt 0.05$ ), with an absolute value of the correlation coefficient as high as 0.96. This article suggests that the hemiplegic gait index is a reliable mobility assessment tool to better support traditional clinical decision-making and improve the efficiency of rehabilitation therapy.

Published
2024
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25. Cascaded p–d Orbital Hybridization Interaction in Ultrathin High‐Entropy Alloy Nanowires Boosts Complete Non‐CO Pathway of Methanol Oxidation Reaction

Author

Lv, Yipin, primary, Liu, Pei, additional, Xue, Ruixin, additional, Guo, Qiudi, additional, Ye, Jinyu, additional, Gao, Daowei, additional, Jiang, Guangce, additional, Zhao, Shiju, additional, Xie, Lixia, additional, Ren, Yunlai, additional, Zhang, Pengfang, additional, Wang, Yao, additional, and Qin, Yuchen, additional

Published
2024
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31. Electronegativity Induced d‐Band Center Offset for Pt‐Rh Dual Sites in High‐Entropy Alloy Boosts Liquid Fuels Electrooxidation.

Author

Lv, Yipin, Lin, Liangliang, Xue, Ruixin, Zhang, Pengfang, Ma, Fengya, Gan, Tao, Zhang, Jiawei, Gao, Daowei, Zheng, Xiaobo, Wang, Ligang, Qin, Yuchen, Zhao, Hui, Dong, Yuming, Wang, Yao, and Zhu, Yongfa

Subjects
LIQUID fuels, LIQUID alloys, ELECTRONEGATIVITY, OXIDATION of methanol, PLATINUM group, ORBITS (Astronomy)
Abstract

Investigating the catalytic behavior of the liquid fuels on well‐defined dual sites is crucial in understanding electrocatalytic reactions. Herein, concept holding bidirectional electronegativity dominant d‐band center regulation on Pt‐Rh dual sites is proposed to tailor the catalytic behaviors toward methanol oxidation reaction (MOR). The Pt‐Rh dual sites are engineered by introducing the low‐electronegativity Ga/Ni and high‐electronegativity W elements in PtRhGaNiW high‐entropy alloy (HEA), which can drive the electron cloud of Pt‐Rh dual sites redispersing over a wide orbit window. The optimized Pt‐Rh dual sites in PtRhGaNiW HEA nanowire achieve a high current density of 5.61 mA cm−2 toward MOR, which is 3.38 and 9.75 times than that of PtRh alloy (1.66 mA cm−2) and Pt/C (0.57 mA cm−2), as well as remarkably stability and COads poisonous resistance. The theoretical calculations further disclose that the redistribution of surface localized electron around Pt‐Rh dual sites can promote direct oxidation of ─OH, and accelerate the COads oxidation/removal. This work presents a breakthrough in designing advanced dual site electrocatalysts for complex catalytic reactions. [ABSTRACT FROM AUTHOR]

Published
2024
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39. Synergistic effects of p-d orbital hybridization and CeO2surface engineering on PtBi nanoplates for methanol electro-oxidation

Author

Zhang, Yan’ao, Wang, Shuai, Si, Feiyan, Xue, Ruixin, Lv, Yipin, Chen, Guozhu, and Gao, Daowei

Abstract

Modulating the electronic structure of Pt is an effective strategy for enhancing the activity and durability of Pt-based electrocatalysts. Herein, we reported a type of intermetallic CeO2/PtBi nanoplates (NPs), which possessed enhanced activity and durability for methanol electro-oxidation reaction (MOR) through strong p-d hybridization between the Pt and Bi. The surface-deposited CeO2can further optimize the electronic structure of Pt, while providing more hydroxyl adsorption sites. Specifically, the CeO2/PtBi NPs exhibited excellent mass activity for MOR in both acidic and alkaline environments, which were 1.62 and 7.65 times higher than those of commercial Pt/C, respectively. After 1000 durability tests in acidic and alkaline environments, the activities of CeO2/PtBi NPs only decreased by 20.1% and 39.8%, respectively, while the activities of commercial Pt/C decreased by 55.4% and 78.5%, respectively. The excellent activity and durability can be attributed to the modulation of the electronic structure through p-d orbital hybridization between Pt, Bi and the surface-deposited CeO2. This study provides new insights into the electronic structure regulation of Pt-based electrocatalysts.

Published
2024
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40. Room‐Temperature Aerobic Oxidation of Amines to Nitriles over Ruthenium Oxide Supported on CeO2 Derived from MOFs.

Author

Huang, Decai, Sun, Hao, Li, Jingwen, Zheng, Junhao, Yang, Darun, Chen, Guozhu, Gao, Daowei, and Zhao, Huaiqing

Subjects
RUTHENIUM oxides, NITRILES, AMINES, ALIPHATIC amines, CATALYTIC activity, NITRILE oxides, AROMATIC amines
Abstract

Heterogenous BPDC−RuO2−CeO2 catalyst derived from Ce−BPDC MOFs can successfully enable the oxidation of amines to nitriles under mild conditions (1 atm O2, H2O as a solvent, room temperature). The catalytic system has the good compatibility with benzylic and aliphatic amines. Lewis acid‐base pairs [Ru−O−Ce−Vö] formed by the combination of acidic oxygen vacancy and basic oxygen pair Ru−O−Ce on the surface of the catalyst is the key factor for the catalytic activity. The mechanical experiments indicate that amines adopt the step‐by‐step dehydrogenation process to nitriles in this transformation. Moreover, the catalyst could be recycled up to six times without the evident loss of catalytic activity and the change of morphology. [ABSTRACT FROM AUTHOR]

Published
2023
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