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SSRN 2024年

作者： Liu, Fei-Yan Xu, Su-Yong Triki, Houria Choudhuri, Amitava Zhou, Qin Research Group of Nonlinear Optical Science and Technology School of Mathematical and Physical Sciences Wuhan Textile University Wuhan430200 China College of Optical Mechanical and Electrical Engineering Zhejiang A&F University Lin’an 311300 China Radiation Physics Laboratory Department of Physics Faculty of Sciences Badji Mokhtar University P. O. Box 12 Annaba23000 Algeria Department of Physics The University of Burdwan West Bengal Golapbag 713104 India State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Wuhan430200 China

In this paper, we investigate the nonautonomous bright/dark solitons in a quasi-one-dimensional spin-1 Bose-Einstein condensates through a three coupled Gross-Pitaevskii (GP) system with space-time-dependent external potential and temporally modulated gain/loss distributions. Based on the Hirota bilinear method, we analytically construct the bright soliton solutions when the coupled GP system exhibits attractive interactions, while we obtain the dark soliton solutions when the coupled GP system exhibits repulsive interactions. The influence of spatiotemporal modulated external potentials, such as the gain/loss distribution Γ(t), on bright/dark soliton dynamics is analyzed in detail via the analytical solutions. By taking different Γ(t), we obtain different types of bright solitons, including periodic, dromion-like and parabolic solitons, and also derive dark solitons on different backgrounds, such as periodic, parabolic and kink backgrounds. We analyze the regulatory effects of different wavenumber ratios on the attraction and squeezing of bound-state solitons. Through the asymptotic analysis, we find that the interactions between two solitons are elastic. In addition, we conduct research on the forward and inverse problems of the above results via the parallel hard-constraint physical informed neural network (phPINN) method. The predicted solitons and potential functions are in good agreement with the exact solitons and potential in the system. © 2024, The Authors. All rights reserved.

关键词： Solitons

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Single-Atom Engineering of Covalent Organic Framework for Photocatalytic H2 Production Coupled with Benzylamine Oxidation

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Small 2023年第35期19卷

作者： Xia, Yang Zhu, Bicheng Li, Liuyi Ho, Wingkei Wu, Jinsong Chen, Haoming Yu, Jiaguo The Education University of Hong Kong Tai Po New Territories 999077 Hong Kong State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Laboratory of Solar Fuel Faculty of Materials Science and Chemistry China University of Geosciences 388 Lumo Road Wuhan430074 China Key Laboratory of Eco-materials Advanced Technology College of Materials Science and Engineering Fuzhou University New Campus Fujian Minhou350108 China State Key Laboratory of Marine Pollution City University of Hong Kong Tat Chee Avenue Kowloon999077 Hong Kong Department of Chemistry National Taiwan University Taipei10617 Taiwan

In photocatalysis, reducing the exciton binding energy and boosting the conversion of excitons into free charge carriers are vital to enhance photocatalytic activity. This work presents a facile strategy of engineering Pt single atoms on a 2D hydrazone-based covalent organic framework (TCOF) to promote H2 production coupled with selective oxidation of benzylamine. The optimised TCOF-Pt SA photocatalyst with 3 wt% Pt single atom exhibited superior performance to TCOF and TCOF-supported Pt nanoparticle catalysts. The production rates of H2 and N-benzylidenebenzylamine over TCOF-Pt SA3 are 12.6 and 10.9 times higher than those over TCOF, respectively. Empirical characterisation and theoretical simulation showed that the atomically dispersed Pt is stabilised on the TCOF support through the coordinated N1-Pt-C2 sites, thereby induing the local polarization and improving the dielectric constant to reach the low exciton binding energy. These phenomena led to the promotion of exciton dissociation into electrons and holes and the acceleration of the separation and transport of photoexcited charge carriers from bulk to the surface. This work provides new insights into the regulation of exciton effect for the design of advanced polymer photocatalysts. © 2023 Wiley-VCH GmbH.

关键词： Oxidation

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Sponge-based FeS x triggers enhanced and durable water decontamination from Cr(VI): Accelerated electron transfer and slow-releasing property

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Environmental Research 2025年 283卷 122119页

作者： Shou Mei Longjie Liu Yiqing Du Rongling Wang Ziyi Zhan Aoxue Qin Shenglan Zhao Yuxuan Ye Yuwei Deng Qiang Li Fei Pan School of Resources and Environment Wuhan Textile University Wuhan 430200 China State Key Laboratory of New Textile Materials and Advanced Processing Wuhan Textile University Wuhan 430200 China

Developing strategies for efficient and durable reduction of Cr(VI) in wastewater is still a desirable and challenging task. Herein, we successfully load the iron-sulfur composite (FeS x ) uniformly on the melamine sponge (MS) through in-situ deposition to form a three-dimensional composite FeS x /MS. Compared with typical iron minerals (e.g., FeS 2 ), FeS x /MS was significantly better at removing Cr(VI) in water, with the removal rate increased from 14.78 % to 99.44 %. The reaction kinetics of FeS x /MS (0.1011 min −1 ) was 37 times that of FeS 2 (0.0027 min −1 ). SEM-EDS results showed that FeS x was uniformly loaded on the sponge, forming a high density of active sites. XPS analysis displayed that the proportion of SO 4 2− was increased from 39.22 % to 61.18 %, implying the involvement of FeS x /MS in the reduction of Cr(VI). Tafel scanning and cyclic voltammetry (CV) results confirmed that the enhanced reduction performance was attributed to the accelerated electron transfer and sufficient electron supply capability. Additionally, the deposition of Cr(OH) 3 on FeS x /MS is evidenced to be responsible for eliminating total Cr from water. The influence of water chemistry, i.e., pH, Cr(VI) concentration, and co-existed substances, on Cr(VI) removal during FeS x /MS treatment was systematically examined. The removal capacity of Cr(VI) in tap water, natural water, and industrial wastewater, is more than 90 %, suggesting a strong anti-interference ability of FeS x /MS. The rapid flow dynamic simulation experiment demonstrates that FeS x /MS can achieve efficient removal of Cr(VI) and slow-releasing of Fe. The removal rate of Cr(VI) reached 100 % in the first 10 cycles, whereas the final effluent concentration was only 0.14 mg/L. This study provides a rational design of corresponding approaches to deal with Cr(VI) pollution.

关键词： Cr (VI) removal FeS(x) Slow-release Sponge Water treatment

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Enhancement of oxygen reduction activity and stability via introducing acid-resistant refractory Mo and regulating the near-surface Pt content

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Journal of Energy Chemistry 2020年第12期29卷 246-252页

作者： Shouquan Feng Jiajia Lu Lin Luo Guangfu Qian Jinli Chen Hanna SAbbo Salam JJTitinchi Shibin Yin College of Chemistry and Chemical Enginering.School of Physical Science and Technology.Key Laboratory of New Processing Technology for Nonferrous Metals and Materials State Key Laboratory of Processing for Non Ferrous Metal and Featured MaterialsGuangxi UniversityNanning 530004.GuangxiChina Department of Chemitry University of the Western Cape7535 Cape TownSouth Africa

Although Pt Ni catalyst possesses good oxygen reduction activity, its poor stability is the main obstacle for the commercialization of proton exchange membrane fuel cells(PEMFCs). In this work, we introduce the acid-resistant refractory Mo to enhance the structure stability and modify the electronic structure of Pt in the prepared PtNi catalyst, improving the catalytic activity for oxygen reduction reaction(ORR). In addition, near-surface Pt content in the nanoparticle is also optimized to balance the ORR activity and stability. The electrochemical results show that the alloy formed by Mo and Pt Ni is obviously more stable than the PtNi alloy alone, because the acid-resistant Mo and its oxides effectively prevent the dissolution of Pt. Especially, the Pt3 Ni3 MoN/C exhibits the optimal ORR catalytic performance in O2-saturated 0.1 mol L^(-1) HClO4 aqueous solutions, with mass activity(MA) of 900 m A mg^(-1) Pt at 0.90 V vs. RHE, which is 3.75 times enhancement compared with the commercial Pt/C(240 mA mg^(-1) Pt). After 30 k accelerated durability tests, its MA(690 m A mg^(-1) Pt) is still 2.88 times higher than the pristine Pt/C. This study thus provides a valuable method to design stable ORR catalysts with high efficiency and has great significance for the commercialization of PEMFCs.

关键词： Oxygen reduction reaction Surface platinum content regulate Ternary alloy catalyst Activity Stability

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Tellurium Filled Carbon Nanotubes Cathodes for Li-Te Batteries with High Capacity and Long-Term Cyclability

SSRN

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SSRN 2023年

作者： Rao, Shaoqing Wu, Ruizhe Zhu, Zhu Wu, Jinsong Ding, Yao Mai, Liqiang School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Collaborative Innovation Center for Advanced Organic Chemical Materials Co-constructed by the Province and Ministry Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules College of Chemistry and Chemical Engineering Hubei University Wuhan430062 China

Li-Te batteries, compared with traditional lithium-ion batteries and Li-other group VIA elements (including O, S, Se) batteries, have shown overwhelming features of high specific volumetric capacity and superior electrical conductivity. These features make the Li-Te batteries possess great importance in modern portable electronics and electric vehicles with limited battery package size. However, the Achilles' Heel in Li-Te batteries is the huge volume change and inevitable shuttle effect of polytellurides during cycling. Herein, we synthesize a cathode material based on polycrystalline Te encapsulated in N-doped multiwall carbon nanotubes (Te-filled CNTs) by physical vapor transport (PVT) method. With unique spatial restriction of the CNT hosts, the electrochemically active Te content can be well preserved, and the prepared Te-filled CNTs cathodes deliver a high specific capacity of 590 mAh g-1 based on Te content. More importantly, the reaction kinetics and electrochemical reversibility of the cathodes have been significantly improved by using nanoscale cavities (4-6 nm) by which the polytellurides are stabilized. Meanwhile, a series of in situ Raman, XRD and TEM characterizations are carried out to reveal a two-step discharge/charge mechanism for Te-filled CNTs, which is the key for the excellent cycling stability. In addition, theoretical calculations prove that the encapsulated Te ensure a lower energy barrier for lithiation compared with bare CNT. This work sheds light on the nanoconfinement effect of CNT for improving the utilization and cycling stability of Te in Li-Te batteries, and provides a new strategy of designing high-performance group VIA element based cathodes. © 2023, The Authors. All rights reserved.

关键词： Cathodes

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Modulating the Valence of in on the Thermoelectric Properties of Pb0.99in0.01te1-Xsx Compounds

SSRN

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SSRN 2023年

作者： Hu, Qin Liu, Keke Wu, Jinsong Su, Xianli Zhang, Qingjie Tang, Xinfeng Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Xiangyang441000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Nanostructure Research Center Wuhan University of Technology Wuhan430070 China

In dopant demonstrates a distinct role in PbTe and PbS compounds though they possess the same crystal structure. Therefore, to unravel how the thermoelectric performance evolves in the In-doped PbTe1-xSx solid solution is crucial. Herein, a series of Pb0.99In0.01Te1-xSx samples were synthesized by conventional melting methods. It is found that doping In in PbTe introduces a shallow level impurity state In3+ and a deep level associated with the In+ state simultaneously. Alloying PbS in Pb0.99In0.01Te1-xSx compounds modulates the valence of In dopant, increasing the relative ratio of In3+ content due to the stronger oxidation capacity of S in comparison with that of Te. This augments the room temperature carrier concentration from 3.03×1018 cm-3 for Pb0.99In0.01Te compound to 6.51×1018 cm-3 for Pb0.99In0.01Te0.88S0.12 compound. Therefore, an improved power factor of 17.4 μW cm−1 K−2 for Pb0.99In0.01Te0.91S0.09 sample is obtained at room temperature. Additionally, alloying PbS in Pb0.99In0.01Te1-xSx compounds enhances the point defect phonon scattering and lowers the lattice thermal conductivity from 1.99 W m-1 K-1 for Pb0.99In0.01Te compound to 1.09 W m-1 K-1 for Pb0.99In0.01Te0.88S0.12 compound at room temperature. As a consequence, a maximum ZT value of 1.12 at 723 K is attained for Pb0.99In0.01Te0.95S0.05 compound, which is improved by 19% in comparison with that of Pb0.99In0.01Te compound. This work provides a new path for modulating the doping behavior of cation site dopant via alloying on anion site to further improve the ZT value in thermoelectric materials. © 2023, The Authors. All rights reserved.

关键词： Alloying

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Phase Boundary Mapping for High Thermoelectric Performance Β-Zn4sb3 in Zn-in-Sb Ternary System

SSRN

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SSRN 2023年

作者： Zhong, Shenlong Liu, Keke Duan, Yusong Zhang, Qingjie Wu, Jinsong Su, Xianli Tang, Xinfeng Hubei Longzhong Laboratory Wuhan University of Technology Xiangyang Demonstration Zone Xiangyang441000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China Nanostructure Research Center Wuhan University of Technology Wuhan430070 China

Zn4Sb3 with complex structure shows excellent thermoelectric performance in the low temperature region. Herein, three batches of In doped Zn4Sb3 were synthesized and the influence of In dopant and Zn content on the thermoelectric properties of Zn4Sb3 was systematically investigated by using a phase boundary method. The isothermal ternary phase diagram of Zn-In-Sb is explored at 623 K. The solubility limit of In in the single phase region with β-Zn4Sb3 structure is strongly related to the ratio between Zn+In and Sb. In atoms preferentially occupy C interstitial of 48f site in the crystallographic Wyckoff position and Zn deficiency increases the concentration of Zn vacancies on this site, enhancing the solubility limit of In in the system. The modification of structure via doping with In hinders the movement and diffusion of Zn interstitial in Zn4Sb3, accompanying with the disappearance of the low temperature phase transitions from α' to α phase and from α to β phase. The regulation of Zn and In contents in single phase region with β-Zn4Sb3 structure effectively optimizes the thermoelectric performance. A maximum ZT value of 1.43 is attained at 673 K for (Zn0.96In0.04)4.15Sb3 compound, which demonstrate a 47 % improvement in comparison with that of Zn4.15Sb3 compound. This work provides a new avenue to further improve thermoelectric properties of Zn4Sb3 compounds. © 2023, The Authors. All rights reserved.

关键词： Solubility

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Remarkable De/Hydrogenation Kinetics and Long-Term Cycling Stability for 2libh4-Mgh2 System Via 2d Tinb2o7 Nanoflake Catalyzing

SSRN

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SSRN 2024年

作者： Li, Zhenglong Xian, Kaicheng Gao, Mingxia Qu, Shanqing Wu, Meihong Gan, Jiantuo Yang, Yaxiong Zhang, Xin Sun, Wenping Liu, Yongfeng Pan, Hongge Institute of Science and Technology for New Energy Xi’an Technological University Xi’an710021 China State Key Laboratory of Silicon and Advanced Semiconductor Materials School of Materials Science and Engineering Zhejiang University Hangzhou310027 China North University of China China

To solve the problem of large-scale hydrogen energy storage, 2LiBH4-MgH2 has been widely studied owing to its high hydrogen storage capacity. However, sluggish kinetics and insufficient reversibility impeded its practical application. Herein, the layered bimetallic titanium-niobium oxide (2D-TiNb2O7) nanoflake was added to introduce highly dispersed ultra-fine TiB2 and NbB2 in the Li-Mg-B-H system as catalysts. As a result, excellent kinetic properties with long-term cycling stability were achieved. For the LMBH-5TNO system with 5 wt% 2D–TiNb2O7 added, 9.8 wt% H2 can be released within 20 min at 400 °C, after which the system can be fully hydrogenated in less than 5 minutes at 350 °C and 10 MPa H2. Moreover, after cycling for 50 times, capacity of 9.4 wt% H2 can be maintained showing a high capacity retention of 96%. Furthermore, it was found out that TiB2 and NbB2 served as heterogeneous nucleation sites for MgB2, reducing the apparent activation energy by 47% and inhibiting the materials coarsening. Meanwhile, the formation of Li2B12H12 was hampered, contributing to maintaining the reversible capacity. This work developed a Li-Mg-B-H system with remarkable kinetics and reversibility, providing an application prospect in high-capacity and reversible hydrogen energy storage systems. © 2024, The Authors. All rights reserved.

关键词： Catalysts

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Adaptive model predictive control of mobile robot with local path refitting

Adaptive model predictive control of mobile robot with local...

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IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Liquan Jiang Yuanlong Xie Zhihui Jiang Jie Meng Wenbin Li State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Wuhan China School of Mechanical Science and Engineering Huazhong University of Science and Technology Wuhan China School of Computer Science Yangtze University Jingzhou China Intelligent Transportation Systems Research Center Wuhan University of Technology Wuhan China

ISBN: (纸本)9781665409858

Path planning and tracking control are important modules of mobile robots, which have outstanding advantages in improving the flexibility of mobile robots. However, in the existing applications, these two modules are usually processed separately, which makes the obstacle avoidance process of the mobile robot uncontrollable and reduces the adaptability of the application scenario. In order to realize collision-free high-precision trajectory tracking control of mobile robots in dynamic scenes, this paper proposes an adaptive MPC control method based on curvature constraints, which can improve the safety of operation and reduce the chattering caused by unreasonable paths in the process of operation. Firstly, according to the kinematic constraints of general mobile robots, the constraint model of mobile robot path planning is constructed. At the same time, the adaptive parameter adjustment rules are adopted to realize the balance between the calculation efficiency and the control cycle. Finally, a smooth safe path is obtained by re-fitting the planned path and reprocessing the nodes with excessive curvature. Compared with traditional methods, the proposed method has better advantages.

关键词： Industrial electronics Electric potential Trajectory tracking Kinematics Safety Planning Mobile robots

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Ultra-high-amplitude Peregrine solitons induced by helicoidal spin-orbit coupling

arXiv

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arXiv 2024年

作者： Ding, Cui-Cui Zhou, Qin Malomed, B.A. Research Group of Nonlinear Optical Science and Technology Research Center of Nonlinear Science School of Mathematical and Physical Sciences Wuhan Textile University Wuhan430200 China State Key Laboratory of New Textile Materials and Advanced Processing Technologies Wuhan Textile University Wuhan430200 China Department of Physical Electronics School of Electrical Engineering Faculty of Engineering The Center for Light-Matter University Tel Aviv University Tel Aviv Israel Instituto de Alta Investigación Universidad de Tarapacá Casilla 7D Arica Chile

In the framework of the model of a spatially non-uniform Bose-Einstein condensate with helicoidal spin-orbit (SO) coupling, we find abnormal Peregrine solitons (PSs) on top of flat and periodic backgrounds, with ultra-high amplitudes. We explore the roles of the SO coupling strength and helicity pitch in the creation of these anomalously tall PSs and find that their amplitude, normalized to the background height, attains indefinitely large values. The investigation of the modulation instability (MI) in the same system demonstrates that these PSs exist in a range of relatively weak MI, maintaining the feasibility of their experimental observation. Copyright © 2024, The Authors. All rights reserved.

关键词： Solitons

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