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Multiscale structural engineering of carbon nitride for enhanced photocatalytic H2O2 production

Nano Research 2023年第4期16卷 4524-4530页

作者： Qing He Bounxome Viengkeo Xuan Zhao Zhengyuan Qin Jie Zhang Xiaohan Yu Yongpan Hu Wei Huang Yanguang Li Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou 215123China National Laboratory of Solid State Microstructures School of Physicsand Collaborative Innovation Center for Advanced MicrostructuresNanjing UniversityNanjing 210093China Macao Institute of Materials Science and Engineering Macao University of Science and TechnologyMacao 999078China

Carbon nitride(C_(3)N_(4))holds great promise for photocatalytic H_(2)O_(2)production from oxygen *** spite of great research efforts,they still suffer from low catalytic efficiency primarily limited by the fast recombination of photogenerated charge *** this work,we report the multiscale structural engineering of C_(3)N_(4)to significantly improve its optoelectronic properties and consequently photocatalytic *** product consists of porous spheres with high surface areas,abundant nitrogen defects,and alkali metal *** visible light irradiation,our catalyst shows a remarkable H_(2)O_(2)production rate of 3,080μmol·g^(−1)·h^(−1),which is more than 10 times higher than that of bulk C_(3)N_(4)and exceeds those of most other C_(3)N_(4)-based ***,the catalyst exhibits great stability,and can continuously work for 15 h without obvious activity decay under visible light irradiation,eventually giving rise to a high H_(2)O_(2)concentration of ca.45 mM.

关键词： photocatalytic H_(2)O_(2)production oxygen reduction carbon nitride multiscale structural engineering

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Trinuclear Dy(III)Single-Molecule Magnets with Two-Step Relaxation

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Chinese Journal of Chemistry 2023年第20期41卷 2641-2647页

作者： Yi-Shu Jin Cai-Ming Liu Yi-Quan Zhang Hui-Zhong Kou Engineering Research Center of Advanced Rare Earth Materials(Ministry of Education) Department of ChemistryTsinghua UniversityBeijing100084 China Beijing National Laboratory for Molecular Sciences Center for Molecular ScienceInstitute of ChemistryChinese Academy of SciencesBeijing100190 China Jiangsu Key Lab for NSLSCS School of Physical Science and TechnologyNanjing Normal UniversityNanjingJiangsu210023 China

The reaction of DyCl_(3)·6H_(2)O with a rigid diacylhydrazone ligand(H_(2)L)afforded a trinuclear precursor[Dy_(3)L_(2)Cl_(3)(H_(2)O)_(2)(CH_(3)OH)]Cl_(2)·3CH_(3)OH(1).The replacement of the Cl-ions and the coordinating solvents by the aryloxides ligands(Lx)-yields three trinuclear complexes[Dy_(3)L_(2)(Lx)_(5)]·nsol(x=1,2-naphthol(2);x=2,7-hydroxycoumarin(3);and x=3,phenol(4)).In complexes 2-4,two end Dy^(3+)centers adopt almost identical N_(4)O_(4) coordination sphere of D6h geometry while the central one adopts N_(4)O_(5) coordination sphere in Cs *** measurements reveal weak antiferromagnetic interactions in the hydrated samples 2e-4e and two-step slow relaxation process under zero dc field with effective energy barriers Ueff of 439 and 91 K,353 and 40 K,466 and 89 K for SR and FR in 2e-4e,*** dynamic magnetic behaviour for 4 persists in the magnetically diluted sample of 4@*** 4 possesses the short Dy-O_(aryloxide) bond distance of 2.055(18)Å,and the largest Ueff among the reported linear trinuclear dysprosium ***,the functionalized aryloxides ligands(Lx)-show photoluminescence via intramolecular energy transfer,making 2e-4e luminescent Dy^(3+)SMMs with high energy barriers.

关键词： Coordination modes Lanthanides Crystal structure Ab initio calculations Magnetic properties Luminescence

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Wear-resistant HfCx film with infrared-visible compatible stealth property

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Ceramics International 2025年

作者： Zou, Gaopeng Wang, Qianqian Sheng, Ruixin Sun, Ligang Shao, Qiyue Zhang, Xuhai Jia, Zhe Shen, Baolong School of Materials and Engineering Jiangsu Key Laboratory for Advanced Metallic Materials Southeast University Nanjing211189 China School of Materials Science and Engineering Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing Institute of Technology Nanjing211167 China School of Science Harbin Institute of Technology Shenzhen518055 China

Ultra-high temperature ceramic films have offered a combination of low infrared emissivity and durability in extremely harsh environments. However, desired applications have been limited by high visible light reflectivity. Herein, a novel strategy, by adjusting C stoichiometry and energy input, is proposed to construct a HfC0.91 film consisted of HfC columnar nanograins with a width of 14.3 ± 0.4 nm and a-C phase at triple junctions, as well as exhibiting significantly increased surface roughness. The resulting microstructure simultaneously achieved excellent infrared-visible compatible stealth and tribo-mechanical properties. The infrared reflectivity/emissivity in the wavelength band of 8–14 μm is 0.9/0.1 primarily attributed to a reduction in lattice vibration absorption, while the low visible reflectivity (0.33) is mainly dominated by reduced plasma energy and enhanced multiple scattering absorption. Furthermore, the HfC0.91 film exhibited improved wear-resistance due to the self-lubricating properties of a-C phase. Thus, this work offers a new strategy for designing wear-resistant HfCx film with infrared-visible compatible stealth property for application in extreme thermo-mechanical service environments. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Multiple scattering

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Co-wavelength-channel Integration of Ultra-low-frequency Distributed Acoustic Sensing and High-Capacity Communication

Co-wavelength-channel Integration of Ultra-low-frequency Dis...

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2024 Asia Communications and Photonics Conference, ACP 2024 and International Conference on Information Photonics and Optical Communications, IPOC 2024

作者： Gu, Long Xiang, Meng Zhang, Zebing Liu, Chaocheng Xu, Pengbai Sun, Wei Yang, Jun Fu, Songnian Wang, Yuncai Qin, Yuwen Institute of Advanced Photonics Technology School of Information Engineering Guangdong University of Technology Guangzhou510006 China Key Laboratory of Photonic Technology for Integrated Sensing and Communication Ministry of Education of China Guangdong University of Technology Guangzhou510006 China Guangdong Provincial Key Laboratory of Information Photonics Technology Guangdong University of Technology Guangzhou510006 China Jiangsu Alpha Optic-electric Technology Co. Ltd. Suzhou215200 China

ISBN: (纸本)9798350379266

We experimentally demonstrate, for the first time, the co-wavelength-channel integration of ultra-low-frequency distributed-acoustic-sensing and high-capacity communication over a 38-km weakly-coupled-seven-core fiber, achieving a sensitivity of 3.89 - nΕ Hz @0.1-Hz with 20-m spatial-resolution and a transmission capacity of 241.85-Tb/s. © 2024 IEEE.

关键词： Optical fiber communication

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Tactile-Based Object Pose Estimation Employing Extended Kalman Filter 8

Tactile-Based Object Pose Estimation Employing Extended Kalm...

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8th IEEE International Conference on advanced robotics and Mechatronics, ICARM 2023

作者： Lin, Qiguang Yan, Chaojie Li, Qiang Ling, Yonggen Zheng, Yu Lee, Wangwei Wan, Zhaoliang Huang, Bidan Liu, Xiaofeng College of IoT Engineering Hohai University Jiangsu Key Laboratory of Special Robotic Technology Jiangsu Changzhou213022 China Zhejiang University Institute of Cyber-System and Control State Key Laboratory of Industrial Control and Technology Hangzhou China Bielefeld33619 Germany Tencent Robotics X Shenzhen China School of Computer Science and Engineering Sun Yat-sen University Guangzhou China

ISBN: (纸本)9798350300178

In this paper, we present a new approach to estimate the pose of an object being manipulated by a multi-fingered robotic hand. The method utilizes advanced tactile sensors with high spatial resolution to optimize the estimation of the object's pose using an Extended Kalman Filter (EKF) based approach. We defined and derived the state and measurement equations, as well as evaluated the estimation accuracy in grasping tasks. The approach is able to effectively account for the pose transition caused by tactile pushing, and the mapping from the object's pose to the contact position and normal direction as measured by the tactile sensor. The method was evaluated in multiple grasping experiments in simulation scenarios. Results show that the estimation can converge towards the ground truth in a relatively short period of time, with displacement and rotation errors remaining within acceptable levels. This new method has the potential to improve the accuracy and reliability of robotic grasping and manipulation tasks. © 2023 IEEE.

关键词： Extended Kalman filters

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NFSI-catalyzed S–S bond exchange reaction for the synthesis of unsymmetrical disulfides

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Chinese Chemical Letters 2022年第9期33卷 4269-4272页

作者： Mengjie Song Qingyue Hu Zheng-Yi Li Xiaoqiang Sun Ke Yang Jiangsu Key Laboratory of Advanced Catalytic Materials&Technology School of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China Institute of Urban&Rural Mining Changzhou UniversityChangzhou 213164China

The metal-free S–S bond exchange reaction of symmetrical disulfides catalyzed by NFSI is described. This novel protocol provides a facile and efficient approach to accessing important unsymmetrical ***, this strategy could also be utilized in the late-stage functionalization of amino acids, drugs,and natural products. The broad substrate scope, good functional group tolerance and easy accessibility of catalyst indicate that this strategy affords a green and practical complementary method to various unsymmetrical disulfides.

关键词： Metal-free Ssingle bond S bond exchange NFSI Unsymmetrical disulfides Organic synthesis

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Efficient rejuvenation of heterogeneous{[(Fe_(0.5)Co_(0.5))_(0.75)B_(0.2)Si_(0.05)]_(96)Nb_(4)}_(99.9)Cu_(0.1) bulk metallic glass upon cryogenic cycling treatment

引用

Journal of Materials Science & technology 2022年第2期97卷 20-28页

作者： Siyi Di Qianqian Wang Yiyuan Yang Tao Liang Jing Zhou Lin Su Kuibo Yin Qiaoshi Zeng Litao Sun Baolong Shen School of Materials Science and Engineering Jiangsu Key Laboratory for Advanced Metallic MaterialsSoutheast UniversityNanjing211189China SEU-FEI Nano-Pico Center Key Laboratory of MEMS of Ministry of EducationSoutheast UniversityNanjing210096China Institute of Massive Amorphous Metal Science China University of Mining and TechnologyXuzhou221116China

The effects of cryogenic thermal cycling on deformation behaviour and structural variation of{[(Fe_(0.5)Co_(0.5))_(0.75)B_(0.2)Si_(0.05)]_(96)Nb_(4)}_(99.9)Cu_(0.1) bulk metallic glass(BMG)were studied and compared with Cufree[(Fe_(0.5)Co_(0.5))_(0.75)B_(0.2)Si_(0.05)]_(96)Nb_(4) *** thermal-cycled treatment between 393 K and cryogenic temperature,the{[(Fe_(0.5)Co_(0.5))_(0.75)B_(0.2)Si_(0.05)]_(96)Nb_(4)}_(99.9)Cu_(0.1)BMG obtained a plastic strain of 7.4%combined with a high yield strength of 4350 *** excellent soft magnetic properties were maintained after CTC *** minor addition of Cu element results in an initial nano-sized heterogeneity in the matrix,which facilitates the rejuvenation process during thermal cycling,and brings to a low optimal thermal temperature of 393 K,making the{[(Fe_(0.5)Co_(0.5))_(0.75)B_(0.2)Si_(0.05)]_(96)Nb_(4)}_(99.9)Cu_(0.1) BMG more attractive in industrial *** thermal cycling,the formation of more soft regions leads to the increase of structural heterogeneities,which is beneficial to the initiation of shear transition zones and the formation of multiple shear bands,and thus results in the enhancement of *** study links the subtle variation of specific structure with macroscopic mechanical properties,and provides a new insight of composition selection for cryogenic thermal cycling treatment.

关键词： Bulk metallic glass Plasticity Cryogenic thermal cycling Rejuvenation Structural heterogeneity

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Motion Planning of Mobile Robot with Non-holonomic Constraints 18

Motion Planning of Mobile Robot with Non-holonomic Constrain...

引用

18th IEEE Conference on Industrial Electronics and Applications, ICIEA 2023

作者： Zhang, Kewen Liu, Weilong Wang, Jin Chen, Leijie Lu, Guodong Zhejiang University of Technology Key Laboratory of Special Purpose Equipment and Advanced Processing Technology Ministry of Education College of Mechanical Engineering Hangzhou310023 China Robotics Institute of Zhejiang University Hangzhou310027 China Zhejiang University State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical Engineering Hangzhou310027 China Robotics Research Center of Yuyao City Ningbo315400 China

ISBN: (纸本)9798350312201

This paper proposes a modified spatio-temporal A∗ path planning algorithm for the trajectory planning of mobile robots with non-holonomic constraints. Most path planning algorithms treat mobile robots as to be with holonomic constraints. However, wheeled mobile robots are affected by non-holonomic constraints, which leads to trajectory unreachability. To solve this problem, an improved spatio-temporal A∗ algorithm based on non-holonomic constraints is given, which considers the efficiency, completeness and smoothness of the path. At the same time, by improving the construction form of collision constraint and adding spatio-temporal constraints to the path, the success rate and solving speed of the path planning algorithm for non-holonomic constrained mobile robot are increased. Finally, simulation experiments are given to indicate that the proposed planning algorithm provides an optimized path, while improving the planning success rate and reducing the computational time. © 2023 IEEE.

关键词： Motion planning

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Ternary Heterostructure Cu-Znin2s4/Wo3/Ws2 Flower-Like Microspheres for Highly-Effificient Photocatalytic Hydrogen Evolution Under Visible-Light Irradiation

SSRN

引用

SSRN 2023年

作者： Liu, Fengjiao Zeng, Danni Tian, Yaxi Shen, Tingzhe Gao, Yan Guan, Rongfeng Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of Technology Jiangsu China

Developing a new composite photocatalyst is the key to achieving efficient photocatalytic decomposition of aquatic hydrogen. In this study, Cu-ZnIn2S4/WO3/WS2 nanostructures were prepared by a two-step hydrothermal method. The unique charge transfer mechanism of Cu-doped and mixed heterojunctions (Z-scheme heterojunctions and Type-I heterojunctions) significantly enhances charge transfer and separation, resulting in excellent photocatalytic hydrogen evolution performance of Cu-ZnIn2S4/WO3/WS2. The hydrogen evolution rate of Cu-ZnIn2S4/WO3/WS2 is 93032.29µmol·g-1·h-1, 37.82 and 3.33 times that of ZnIn2S4 and Cu-ZnIn2S4, respectively, and the quantum efficiency at 430nm is 37.04%. It is also superior to Pt-modified Cu-ZnIn2S4 (71654.39µmol·g-1·h-1) and most reported ZnIn2S4-based photocatalysts. In addition, the density functional theory (DFT) calculation results further show that the absolute value of ∆GH* of the composite photocatalyst is significantly reduced to 0.08eV, and the adsorption-desorption potential barrier is reduced considerably, indicating that the Cu-ZnIn2S4/WO3/WS2 photocatalytic system is more favorable to H* adsorption. This excellent performance is attributed to the unique transfer mechanism of Cu doping and mixed heterojunctions. This study provides a new idea for photocatalytic hydrogen production and can provide a valuable reference for future research on photocatalytic hydrogen production technology. © 2023, The Authors. All rights reserved.

关键词： Density functional theory

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Clos-based All-optical Switching Architecture Supporting Mixed Unicast & Multicast Datacenter Services

Clos-based All-optical Switching Architecture Supporting Mix...

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2023 Opto-Electronics and Communications Conference, OECC 2023

作者： Lin, Jiemin Li, Yongcheng Shen, Gangxiang Soochow University School of Electronic and Information Engineering Jiangsu Engineering Research Center of Novel Optical Fiber Technology and Communication Network Suzhou Key Laboratory of Advanced Optical Communication Network Technology Suzhou China

ISBN: (纸本)9781665462136

We design a new multicast-enabled Clos optical switching (MCOS) architecture for datacenter networks. Simulation results show that the proposed architecture can significantly reduce the blocking probabilities of both unicast and multicast services compared with the conventional WSS-based Clos network. It is also found that when the ratio of splitters in the MCOS network is set to be the same as the proportion of multicast services, the proposed architecture can achieve an optimal blocking performance. © 2023 IEEE.

关键词： Blocking probability

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