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Exploring the Rate-Control Step of Toluene Oxidation Over the Novel Octahedral Pt/Mn3o4 Catalyst with Stable Low-Temperature Catalytic Performance Via in Situ Drifts

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SSRN 2024年

作者： Fan, Jie Mao, Lutao Fu, Mingli Liu, Peng Wu, Zuliang Ye, Daiqi School of Environment and Resources Taiyuan University of Science and Technology Taiyuan030024 China Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control School of Environment and Energy South China University of Technology Guangzhou510006 China School of Materials Science and Engineering Taiyuan University of Science and Technology Taiyuan030024 China Advanced Plasma Catalysis Engineering Laboratory for China Petrochemical Industry School of Environmental and Safety Engineering Changzhou University Jiangsu213164 China

The high efficiency and stability of catalysts are crucial for their practical application in toluene oxidation. Herein, a novel octahedral Pt/Mn3O4-110 catalyst with excellent structural stability was synthesized and 100% toluene conversion can be achieved at low-temperature 160 ºC. XRD and Raman results indicated that the structure of Pt/Mn3O4-110 can be well maintained after 120 h on-stream reaction, the resistance to H2O (3 or 5 vol.%) and high concentration toluene (3000 ppm)/CO2 (5 vol.%) tests. In situ DRIFTS comparative studies between Pt/Mn3O4-110 and Pt/Mn3O4-100 (30% toluene conversion at 160 ºC) samples demonstrated that the rate-control steps of toluene oxidation on Pt/Mn3O4-110 and Pt/Mn3O4-100 were both the further oxidation of benzoate species in the presence of gas-phase oxygen, while the transformation of benzaldehyde to benzoate species was the rate-control step on Pt/Mn3O4-100 in the absence of gas-phase oxygen. The weaker Mn-O bonds, richer oxygen vacancies and higher mobility of oxygen species on Pt/Mn3O4-110 sample than that of Pt/Mn3O4-100 are beneficial for the easier release of lattice oxygen from the surface of catalyst and then participated in toluene oxidation via Mars-van Krevelen mechanism, contributing to easier oxidation of benzaldehyde to benzoate species and formation of formic acid and bicarbonate species. © 2024, The Authors. All rights reserved.

关键词： Catalytic oxidation

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Light-induced pure spin transportation in twisted atomic wires of transition metal trichalcogenides

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Physical Review B 2024年第23期110卷 235428-235428页

作者： Chanjuan Shang Haoxiang Dong Yanyan Zhao Wei Pei Jijun Zhao Jian Zhou Si Zhou Key Laboratory of Materials Modification by Laser Ion and Electron Beams (Dalian University of Technology) Ministry of Education Dalian 116024 China Center for Alloy Innovation and Design State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong University Xi'an 710049 China Advanced Materials Division Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Suzhou 215123 China College of Physics Science and Technology Yangzhou University Jiangsu 225009 China Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials School of Physics South China Normal University Guangzhou 510006 China Guangdong-Hong Kong Joint Laboratory of Quantum Matter Frontier Research Institute for Physics South China Normal University Guangzhou 510006 China

Twisting of van der Waals layered materials induces numerous exotic quantum phenomena under symmetry reduction and long-range moiré potential with strong correlation, leading to the pursuit of twistronic materials at different dimensionalities. Here we show that twisted one-dimensional (1D) atomic wires also exhibit intriguing electronic and optical features, tunable by twist angles. By analyzing transition metal trichalcogenide atomic wires, which have been synthesized in experiments, we find that a single chain of WTe3 natively favors a helical structure with a short torsional wavelength of 1.58 nm and a twist angle of 24° as its energy minimum. Twisting the atomic wire azimuthally could realize a metal-to-semiconductor transition and a symmetry-protected persistent spin helix texture. In addition, we propose a light-induced pure spin current generation without a net electric charge current, indicating magnetic moment accumulation at the ends of twisted wires and a sizable spin voltage along the axial direction. These results shed light on exploiting 1D materials for twistronics and chiral spintronics.

关键词： Van der Waals forces

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Origami Actuator with Tunable Limiting Layer for Reconfigurable Soft robotic Grasping

Origami Actuator with Tunable Limiting Layer for Reconfigura...

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IEEE/RSJ International Conference on Intelligent robots and Systems (IROS)

作者： Yang Yang Kejin Zhu Yuan Xie Shaoyang Yan Juan Yi Pei Jiang Yunquan Li Yazhan Zhang Yingtian Li School of Automation Nanjing University of Information Science and Technology Nanjing China Jiangsu Province Engineering Research Center of Intelligent Meteorological Exploration Robot Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen China State Key Laboratory of Mechanical Transmission University of Chongqing Chongqing China Shien-Ming Wu School of Intelligent Engineering South China University of Technology Guangzhou China Peng Cheng Laboratory Shenzhen China Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen China

ISBN: (数字)9798350377705

ISBN: (纸本)9798350377712

This paper presents a soft actuator inspired by origami and a tunable strain limiting layer, which is proposed for reconfigurable soft robotic grasping. Main structure of the actuator is based on Miura origami which generates extension under pressurized air while a limiting layer with tunable length enables the actuator with different motion patterns. By driving the limiting layer through a servo motor, the range of motion and trajectory of the actuator can be pre-programed and the gripper’s grasping range will be affected accordingly. This paper discusses the design, fabrication, analysis and experimental verification of the actuator. Then grasping performance of the gripper under objects of different shapes, sizes, and weights is experimentally evaluated. The reconfigurable soft gripper can be applied as an end-effector to accomplish adaptive grasping tasks with various targets.

关键词： Actuators Limiting Grasping Soft robotics robot sensing systems Trajectory Grippers Motion control Tuning Strain

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Selective Adsorption and Electrocatalysis of Polysulfides through Hexatomic Nickel Clusters Embedded in N-Doped Graphene toward High-Performance Li-S Batteries

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Research 2020年第1期2020卷 922-934页

作者： Jiapeng Ji Ying Sha Zeheng Li Xuehui Gao Teng Zhang Shiyu Zhou Tong Qiu Shaodong Zhou Liang Zhang Min Ling Yanglong Hou Chengdu Liang Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China Beijing Key Laboratory for Magnetoelectric Materials and Devices Beijing Innovation Center for Engineering Science and Advanced Technology(BIC-ESAT)Department of Materials Science and EngineeringCollege of EngineeringPeking UniversityBeijing 100871China Institute of Functional Nano&Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesJoint International Research Laboratory of Carbon-Based Functional Materials and DevicesSoochow UniversitySuzhou215123 JiangsuChina

The shuttle effect hinders the practical application of lithium-sulfur(Li-S)batteries due to the poor affinity between a substrate and Li polysulfides(LiPSs)and the sluggish transition of soluble LiPSs to insoluble Li2S or elemental ***,we report that Ni hexatomic clusters embedded in a nitrogen-doped three-dimensional(3D)graphene framework(Ni-N/G)possess stronger interaction with soluble polysulfides than that with insoluble *** synthetic electrocatalyst deployed in the sulfur cathode plays a multifunctional role:(i)selectively adsorbing the polysulfides dissolved in the electrolyte,(ii)expediting the sluggish liquid-solid phase transformations at the active sites as electrocatalysts,and(iii)accelerating the kinetics of the electrochemical reaction of multielectron sulfur,thereby inhibiting the dissolution of *** constructed S@Ni-N/G cathode delivers an areal capacity of 9.43mAhcm^(-2) at 0.1 C at S loading of 6.8 mg cm^(-2),and it exhibits a gravimetric capacity of 1104mAhg^(-1) with a capacity fading rate of 0.045%per cycle over 50 cycles at 0.2 C at S loading of 2.0 mg cm^(-2).This work opens a rational approach to achieve the selective adsorption and expediting of polysulfide transition for the performance enhancement of Li-S batteries.

关键词： sulfide sulfur insoluble

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Buckling of Cassini Oval Pressure Hulls Subjected to External Pressure

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China Ocean Engineering 2019年第4期33卷 503-508页

作者： TANG Wen-xian WANG Wei-min ZHANG Jian WANG Shu-yan Jiangsu Provincial Key Laboratory of Advanced Manufacturing for Marine Mechanical Equipment Jiangsu University of Science and Technology Zhenjiang 212003 China School of Mechanical Engineering Jiangsu University of Science and Technology Zhenjiang 212003 China

The paper focuses on Cassini oval pressure hulls under uniform external pressure. The Cassini oval pressure hull is proposed based on the shape index of Cassini oval. The buckling of a series of Cassini oval pressure hulls with the shape index of 0.09–0.30 and one spherical pressure hull with the diameter of 2 m is devoted. Such hulls are numerically studied in the case of constant volume, material properties, and wall thickness. The results show that Cassini oval pressure hulls with the shape index of 0.10–0.11 can resist about 4% more external pressure than the spherical one. This deviates from the classical mechanics conclusion that spherical shell is the optimal shape for underwater pressure resistant structures.

关键词： pressure hull Cassini oval shell shape index buckling behaviour external pressure

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A safe and efficient process for the preparation of difluoromethane in continuous flow

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Chinese Journal of Chemical Engineering 2020年第7期28卷 1860-1865页

作者： Tao Shen Xin Ge Hengjun Zhao Zhixiong Xu Shaofeng Tong Shaodong Zhou Chao Qian Xinzhi Chen College of Chemical and Biological Engineering Zhejiang UniversityZhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture TechnologyHangzhou 310027China School of Chemical and Material Engineering Jiangnan UniversityWuxi 214122China Jiangsu Sanmei Chemical Co. Ltd.Nantong 226461China

Difluoromethane is typically produced vialiquid-phase fluorination as performed in a batch ***,this process suffers from some problems,e.g.,severe corrosion of the reactor,high safety risk,and the regeneration of the *** this paper,a flow process as performed in the tubular reactor was *** optimum conditions for continuous synthesis of difluoromethane were obtained as follows:the reaction temperature was 100℃,the molar ratio of dichloromethane to hydrogen fluoride was 1.6:1 and the reaction time was 300 *** operation of the cyclic process was stable for 24 h with the conversion per pass of hydrogen fluoride up to 16.2%.The unreacted raw materials were easily *** deactivation of the common catalyst,antimony pentachloride,was investigated by catalyst concentration curve and XPS *** approach proposed in this work is proven to be safe,efficient and low amount of catalyst.

关键词： Tubular reactor Continuous synthesis Difluoromethane Catalyst

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Observation of Electronic Strong Correlation in VTe2-23×23 Monolayer

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Physical Review Letters 2023年第8期131卷 086501-086501页

作者： Wei-Min Zhao Wenjun Ding Qi-Wei Wang Yu-Xin Meng Li Zhu Zhen-Yu Jia Wenguang Zhu Shao-Chun Li National Laboratory of Solid State Microstructures School of Physics Nanjing University Nanjing 210093 China International Center for Quantum Design of Functional Materials (ICQD) Hefei National Research Center for Physical Sciences at the Microscale Department of Physics University of Science and Technology of China Hefei 230026 China Hefei National Laboratory Hefei 230088 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China Jiangsu Provincial Key Laboratory for Nanotechnology Nanjing University Nanjing 210093 China

Strong electron correlation under two-dimensional limit is intensely studied in the transition metal dichalcogenides monolayers, mostly within their charge density wave (CDW) states that host a star of David period. Here, by using scanning tunneling microscopy and spectroscopy and density functional theory calculations with on-site Hubbard corrections, we study the VTe2 monolayer with a different 23×23 CDW period. We find that the dimerization of neighboring Te-Te and V-V atoms occurs during the CDW transition, and that the strong correlation effect opens a Mott-like full gap at Fermi energy (EF). We further demonstrate that such a Mott phenomenon is ascribed to the combination of the CDW transition and on-site Coulomb interactions. Our work provides a new platform for exploring Mott physics in 2D materials.

关键词： Charge density waves Electronic structure Monolayer films Strongly correlated systems Transition metal dichalcogenides Scanning tunneling microscopy Scanning tunneling spectroscopy

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High Performance Frequency Up-Conversion Energy Harvester Based on PZT Thick Film technology for IoT Applications

High Performance Frequency Up-Conversion Energy Harvester Ba...

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Electronics and Electrical Engineering technology (EEET), International Conference on

作者： Manjuan Huang Xiaowei Feng Zhenming Li Huicong Liu School of Mechanical and Electrical Engineering Soochow University Jiangsu Provincial Key Laboratory of Advanced Robotics Suzhou China Energy Storage and Novel Technology of Electrical Engineering Department China Electric Power Research Institute Beijing China

The development of Internet of Things (IoT) technology has greatly contributed to the development of smart cities, from smart homes to smart factories. The quality of human life is enriched by the comprehensive sensing and seamless communication of IoT devices in different spaces. As a foundation, wireless sensor networks, which currently consist of various fixed sensors, are experiencing sustainability and compatibility issues. Here, we report a broadband vibrational piezoelectric energy harvester (PEH) with frequency up-conversion (FUC) function, consisting of a high-frequency piezoelectric cantilever (HF-PC) with a resonant frequency of 214 Hz and a low-frequency stainless-steel cantilever (LF-SC) with a resonant frequency of 36 Hz, and the HF-PC is fabricated by MEMS PZT thick film technology. Under the excitation of external low-frequency vibration, the LF-SC at the bottom impinges on the HF-PC during its motion, and in this way converts the external low-frequency vibration into high-frequency piezoelectric cantilever vibration. The maximum output power of a single HF-PC is 521.5 ȝ: at 214 Hz and 1.0 g acceleration. On the other hand, the FUC-PEH is capable of achieving a maximum voltage output of 26.6 V over a drive frequency range of 26.2 Hz to 48.4 Hz, with an operating bandwidth of 22.2 Hz and a maximum output power of 775.3 μW. The output power is sufficient to power the Bluetooth temperature and humidity sensor, demonstrating the high power output and excellent charging capability of the FUC-PEH.

关键词： Vibrations Temperature sensors Micromechanical devices Wireless sensor networks Resonant frequency Thick films Voltage

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Ligand-rich oxygen evolution electrocatalysts reconstructed from metal-organic frameworks for anion-exchange membrane water electrolysis

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Science Bulletin 2025年第12期70卷 1976-1985页

作者： Li, Shiqi Liu, Weiwei Shi, Yi Wang, Tang Liu, Tianyang Xue, Xiang Li, Rui Qiao, Man Wu, Zhen-Yu Zhang, Wang College of Materials Science and Engineering College of Environment Zhejiang University of Technology Hangzhou310014 China Department of Chemistry Institute of Innovative Material Guangdong Provincial Key Laboratory of Sustainable Biomimetic Materials and Green Energy Southern University of Science and Technology Shenzhen518055 China Jiangsu Co-Innovation Centre of Efficient Processing and Utilization of Forest Resources College of Chemical Engineering Nanjing Forestry University Nanjing210037 China Institute of Advanced Materials and Flexible Electronics School of Chemistry and Materials Science Nanjing University of Information Science & Technology Nanjing210044 China

Organic ligands in metal-organic frameworks (MOFs) play an indispensable role in the reconstruction and catalysis during the alkaline oxygen evolution reaction (OER). However, it is still a big challenge to maintain a high content of ligands in MOF-reconstructed OER electrocatalysts and to study the interaction between ligands and derived (oxy)hydroxides. Herein, a ligand-rich trimetallic amorphous electrocatalyst is fabricated through a two-step mechanochemical and electrochemical reconstruction strategy. Experimental and theoretical studies clearly reveal that the d-π interaction between delocalized π-electrons on the benzene ring of ligands and derived (oxy)hydroxides, can trigger the charge transfer from ligands to the active metal centers, thus optimizing the adsorption energy of the oxygen-containing intermediates and enhancing the OER performance. Moreover, an anion-exchange membrane water electrolyzer using such ligand-rich OER electrocatalyst can be operated steadily at 1.69 V and 55 °C under an industrial-level current density of 500 mA cm−2 for over 200 h. This work provides novel insights into the role of organic ligands in alkaline OER electrocatalysis, with the potential to facilitate the production of green hydrogen at industrial-level current densities. © 2025 Science China Press

关键词： Electrolysis

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Constructing Cu Ion Sites in Mof/Cof Heterostructure for Noble-Metal-Free Photoredox Catalysis

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SSRN 2022年

作者： Han, Wei Shao, Lu-Hua Sun, Xiao-Jun Liu, Yu-Han Zhang, Feng-Ming Wang, Ya Dong, Peng-Yu Zhang, Gui-Ling Heilongjiang Provincial Key Laboratory of CO2 Resource Utilization and Energy Catalytic Materials School of Material Science and Chemical Engineering Harbin University of Science and Technology No.4 Linyuan Road Harbin150040 China Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province Yancheng Institute of Technology Yancheng224051 China

Covalent organic frameworks (COFs) are an emerging type of visible-light-driven photocatalysts, yet the introduction of Pt cocatalyst is inevitable to achieve an efficient activity in most COF-based photocatalysts. Herein, we report a multifunctional MOF/COF heterostructured photocatalyst, Cu-NH2-MIL-125/TpPa-2-COF, with Cu ions immobilized by -NH2 groups of MOF, where the covalently connected heterojunction facilitates the separation of photogenerated charges and the monodispersed transient Cu2+/Cu+ centers serve as effective active sits. The resultant Cu-NH2-MIL-125/TpPa-2-COF (4:6) exhibits a visible-light-driven photocatalytic H2 evolution rate of 9.21 mmol·g-1·h-1, which is 7.3 and 17.7 times higher than that without Cu coordination and the pristine TpPa-2-COF, respectively, and superior to various reported COF and MOF-based photocatalysts without Pt. Moreover, the photocatalyst can efficiently oxidate amines to imines with high conversion rate (91.2%) and selectivity (>99%). The crucial role of Cu centers as active sites and its stability in long-term reaction was determined. © 2022, The Authors. All rights reserved.

关键词： Hydrogen production

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