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Phase control and stabilization of 1T-MoS_(2) via black TiO_(2-x)nanotube arrays supporting for electrocatalytic hydrogen evolution

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Journal of Energy Chemistry 2022年第5期31卷 71-77页

作者： Ting Zhang Tingxuan Yang Guoxing Qu Saifang Huang Peng Cao Wei Gao Department of Chemical and Materials Engineering the University of AucklandPrivate Bag 92019Auckland 1142New Zealand School of Material Science and Engineering Nanchang UniversityNanchang 330031JiangxiChina School of Materials Science and Engineering Jiangsu University of Science and TechnologyJiangsu 212003ZhenjiangChina

1T phase MoS_(2)(1T-MoS_(2)) is a promising substitute of platinum electrocatalyst for hydrogen evolution reaction(HER)due to its high intrinsic activity but suffering from thermodynamical *** great efforts have been made to synthesize 1T-MoS_(2) and enhance its stability,it remains a big challenge to realize the phase control and stabilization of 1T-MoS_(2).Herein,based on crystal field theory analysis,we propose a new solution by designing an electrocatalyst of 1T-MoS_(2) nanosheets anchoring on black TiO2-xnanotube arrays in-situ grown on Ti plate(1T-MoS_(2)/TiO_(2-x)@Ti).The black TiO_(2-x)substrate is expected to play as electron donors to increase the charge in Mo 4 d orbits of 1T-MoS_(2) and thus weaken the asymmetric occupation of electrons in the Mo 4 d *** results demonstrate that black TiO_(2-x)nanotubes shift electrons to MoS_(2) and induce MoS_(2) to generate more 1 T phase due to stabilizing the 1T-MoS_(2) nanosheets compared with a Ti *** 1T-MoS_(2/)TiO_(2-x)@Ti shows much improved HER performance with a small Tafel slope of 42 m V dec^(-1) and excellent catalytic stability with negligible degradation for 24 *** calculations confirm that the black TiO_(2-x)substrate can effectively stabilize metastable 1T-MoS_(2) due to electrons transferring from black TiO_(2-x)to Mo 4 d *** work sheds light on the instability of 1T-MoS_(2) and provides an essential method to stabilize and efficiently utilize 1T-MoS_(2) for HER.

关键词： 1T-MoS_(2) Black TiO_(2-x)nanotube Hydrogen evolution reaction Phase control Electrocatalyst

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Self-Assembled MXene Supported on Carbonization-Free Wood for a Symmetrical All-Wood Eco-Supercapacitor

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ACS Applied materials and Interfaces 2024年第28期16卷 36322-36332页

作者： Yu, Yuan Chen, Wei-Hsin Wang, Xin Sun, Xiaohan Jiang, Zishuai Li, Meichen Fu, Xinmiao Yang, Haiyue Li, Menggang Wang, Chengyu Key Laboratory of Bio-Based Material Science and Technology of Ministry of Education Northeast Forestry University Harbin150040 China Department of Aeronautics and Astronautics National Cheng Kung University Tainan701 Taiwan School of Materials Science and Engineering Peking University Beijing100871 China

As an emerging two-dimensional (2D) material, MXene has garnered significant interest in advanced energy storage systems, yet the stackable structure, poor mechanical stability, and lack of moldability limit its large-scale applications. To address this challenge, herein, the self-assembly of MXene on carbonization-free wood was obtained to serve as high-performance electrodes for symmetrical all-wood eco-supercapacitors by a steam-driven self-assembly method. This method can be implemented in a low-temperature environment, significantly simplifying traditional high-temperature annealing processes and generating minimal impact on the environment, human health, and resource consumption. The environmentally friendly steam-driven self-assembly strategy can be further extended into various wood-based electrodes, regardless of the types and structures of wood. As a typical platform electrode, the optimized MXene@delignified balsa wood (MDBW) achieves high areal capacitance and specific capacitance values of 2.99 F cm-2 and 580.55 F g-1 at an extensive mass loading of 5.16 mg cm-2, respectively, with almost loss-free capacitance after 10,000 cycles at 50 mA cm-2. In addition, an all-solid-state symmetrical all-wood eco-supercapacitor was further assembled based on MDBW-20 as both positive and negative electrodes to achieve a high energy density of 19.22 μWh cm-2 at a power density of 0.58 mW cm-2. This work provides an effective strategy to optimize wood-based electrodes for the practical application of biomass eco-supercapacitors. © 2024 American Chemical Society.

关键词： Capacitance

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Deep Insight of Design,Mechanism,and Cancer Theranostic Strategy of Nanozymes

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Nano-Micro Letters 2024年第2期16卷 165-217页

作者： Lu Yang Shuming Dong Shili Gai Dan Yang He Ding Lili Feng Guixin Yang Ziaur Rehman Piaoping Yang Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001People’s Republic of China Yantai Research Institute Harbin Engineering UniversityYantai 264000People’s Republic of China Key Laboratory of Green Chemical Engineering and Technology of Heilongjiang Province College of Material Science and Chemical EngineeringHarbin University of Science and TechnologyHarbin 150040People’s Republic of China Department of Chemistry Quaid-i-Azam UniversityIslamabad 45320Pakistan

Since the discovery of enzyme-like activity of Fe3O4 nanoparticles in 2007,nanozymes are becoming the promising substitutes for natural enzymes due to their advantages of high catalytic activity,low cost,mild reaction conditions,good stability,and suitable for large-scale ***,with the cross fusion of nanomedicine and nanocatalysis,nanozyme-based theranostic strategies attract great attention,since the enzymatic reactions can be triggered in the tumor microenvironment to achieve good curative effect with substrate specificity and low side ***,various nanozymes have been developed and used for tumor *** this review,more than 270 research articles are discussed systematically to present progress in the past five ***,the discovery and development of nanozymes are ***,classification and catalytic mechanism of nanozymes are ***,activity prediction and rational design of nanozymes are focused by highlighting the methods of density functional theory,machine learning,biomimetic and chemical ***,synergistic theranostic strategy of nanozymes are ***,current challenges and future prospects of nanozymes used for tumor theranostic are outlined,including selectivity,biosafety,repeatability and stability,in-depth catalytic mechanism,predicting and evaluating activities.

关键词： Nanozymes Classification Prediction and design Catalytic mechanism Tumor theranostics

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Modular Quantum Processor with an All-to-All Reconfigurable Router

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Physical Review X 2024年第4期14卷 041030页

作者： Xuntao Wu Haoxiong Yan Gustav Andersson Alexander Anferov Ming-Han Chou Christopher R. Conner Joel Grebel Yash J. Joshi Shiheng Li Jacob M. Miller Rhys G. Povey Hong Qiao Andrew N. Cleland Pritzker School of Molecular Engineering Department of Physics Center for Molecular Engineering and Material Science Division

Superconducting qubits provide a promising approach to large-scale fault-tolerant quantum computing. However, qubit connectivity on a planar surface is typically restricted to only a few neighboring qubits. Achieving longer-range and more flexible connectivity, which is particularly appealing in light of recent developments in error-correcting codes, however, usually involves complex multilayer packaging and external cabling, which is resource intensive and can impose fidelity limitations. Here, we propose and realize a high-speed on-chip quantum processor that supports reconfigurable all-to-all coupling with a large on-off ratio. We implement the design in a four-node quantum processor, built with a modular design comprising a wiring substrate coupled to two separate qubit-bearing substrates, each including two single-qubit nodes. We use this device to demonstrate reconfigurable controlled-Z gates across all qubit pairs, with a benchmarked average fidelity of 96.00%±0.08% and best fidelity of 97.14%±0.07%, limited mainly by dephasing in the qubits. We also generate multiqubit entanglement, distributed across the separate modules, demonstrating GHZ-3 and GHZ-4 states with fidelities of 88.15%±0.24% and 75.18%±0.11%, respectively. This approach promises efficient scaling to larger-scale quantum circuits and offers a pathway for implementing quantum algorithms and error-correction schemes that benefit from enhanced qubit connectivity.

关键词： Quantum circuits Quantum control Quantum gates Superconducting qubits

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Exploring spin polarization of heavy quarks in magnetic fields and hot medium

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Physical Review C 2024年第3期110卷 034910页

作者： Zhiwei Liu Yunfan Bai Shiqi Zheng Anping Huang Baoyi Chen Department of Physics School of Engineering School of Material Science and Physics

Relativistic heavy-ion collisions give rise to the formation of both deconfined quantum chromodynamics (QCD) matter and a strong magnetic field. The spin of heavy quarks is influenced by interactions with the external magnetic field as well as by random scatterings with thermal light partons. The presence of QCD matter comprising charged quarks can extend the lifetime and strength of the magnetic field, thereby enhancing the degree of heavy quark polarization. However, the random scatterings with QCD matter tend to diminish heavy quark polarization. In this study, we utilize the Landau-Lifshitz-Gilbert equation to investigate both these contributions. Taking into account the realistic evolutions of medium temperatures and the in-medium magnetic fields at the BNL Relativistic Heavy-Ion Collider and the CERN Large Hadron Collider, we observe that heavy quark polarization is limited by the short lifetime of the magnetic field and the high temperatures of the medium. Furthermore, we explore the mass dependence of quark polarization, revealing that the polarization degree of strange quarks is much larger than that of charm quarks.

关键词： Jets & heavy flavor physics Quark matter Quark-gluon plasma Relativistic heavy-ion collisions

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In situ constructing lamella-heterostructured nanoporous CoFe/CoFe2O4 and CeO2-x as bifunctional electrocatalyst for high-current-density water splitting

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稀有金属（英文版） 2025年第2期44卷 1053-1066页

作者： Yue Deng Jin Wang Shao-Fei Zhang Zhi-Jia Zhang Jin-Feng Sun Tian-Tian Li Jian-Li Kang Hao Liu Shi Bai Hebei Key Laboratory of Flexible Functional Materials/Hebei Key Laboratory of Material Near-Net Forming Technology School of Materials Science and EngineeringHebei University of Science and TechnologyShijiazhuang 050018China School of Materials Science and Engineering Institute of Quantum Materials and DevicesState Key Laboratory of Separation Membrane and Membrane ProcessesTiangong UniversityTianjin 300387China School of Materials Science and Engineering Tianjin UniversityTianjin 300380China Materials Science and Technology Research Department Ji Hua LaboratoryFoshan 528000China Advanced Laser Processing Research Team RIKEN Center for Advanced PhotonicsSaitama 351-0198Japan

The stability and electrocatalytic efficiency of transition metal oxides for water splitting is determined by geometric and electronic structure,especially under high current ***,a newly designed lamella-heterostructured nanoporous CoFe/CoFe2O4 and CeO2-x,in situ grown on nickel foam(NF),holds great promise as a high-efficient bifunctional electrocatalyst(named R-CoFe/Ce/NF)for water *** characterization verifies surface reconstruction from CoFe alloy/oxide to highly active CoFeOOH during in situ electrochemical *** virtues of three-dimensional nanoporous architecture and abundant electroactive CoFeOOH/CeO2-x heterostructure interfaces,the R-CoFe/Ce/NF electrode achieves low overpotentials for oxygen evolution(η10=227 mV;η500=450 mV)and hydrogen evolution(η10=35 mV;η408=560 mV)reactions with high nor-malized electrochemical active surface areas,***,the alkaline full water splitting electrolyzer of R-CoFe/Ce/NF‖R-CoFe/Ce/NF achieves a current den-sity of 50 mA·cm-2 only at 1.75 V;the decline of activity is satisfactory after 100-h durability test at 300 mA·*** functional theory also demonstrates that the elec-tron can transfer from CeO2-x by virtue of O atom to CoFeOOH at CoFeOOH/CeO2-x heterointerfaces and enhancing the adsorption of reactant,thus optimizing electronic structure and Gibbs free energies for the improvement of the activity for water splitting.

关键词： Lamellar nanoporous structure Electronic structure regulation High current density Theoretical calculation Overall water splitting

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Dual-functional marigold-like Zn_(x)Cd_(1-x)S homojunction for selective glucose photoreforming with remarkable H_(2)coproduction

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Journal of Energy Chemistry 2023年第4期79卷 158-167页

作者： Fuyan Kang Cai Shi Yeling Zhu Malin Eqi Junming Shi Min Teng Zhanhua Huang Chuanling Si Feng Jiang Jinguang Hu Key Laboratory of Bio-based Material Science and Technology Ministry of EducationMaterial Science and Engineering CollegeNortheast Forestry UniversityHarbin 150040HeilongjiangChina Tianjin Key Laboratory of Pulp and Paper College of Light Industry and EngineeringTianjin University of Science and TechnologyTianjin 300457China Sustainable Functional Biomaterials Lab Department of Wood ScienceUniversity of British Columbia2424 Main MallVancouver V6T 1Z4Canada Department of Chemical and Petroleum Engineering University of Calgary2500 University DriveNWCalgaryAlberta T2N 1N4Canada

The global commitment to pivoting to sustainable energy and products calls for technology development to utilize solar energy for hydrogen(H_(2))and value-added chemicals production by biomass ***,a novel dual-functional marigold-like Zn_(x)Cd_(1-x)S homojunction has been the production of lactic acid with high-yield and H_(2)with high-efficiency by selective glucose *** optimized Zn_(0.3)Cd_(0.7)S exhibits outstanding H_(2)generation(13.64 mmol h^(-1)g^(-1)),glucose conversion(96.40%),and lactic acid yield(76.80%),over 272.80 and 19.21 times higher than that of bare ZnS(0.05 mmol h^(-1)g^(-1))and CdS(0.71 mmol h^(-1)g^(-1))in H_(2)generation,*** marigold-like morphology provides abundant active sites and sufficient substrates accessibility for the photocatalyst,while the specific role of the homojunction formed by hexagonal wurtzite(WZ)and cubic zinc blende(ZB)in photoreforming biomass has been demonstrated by density functional theory(DFT)*** is converted to lactic acid on the WZ surface of Zn_(0.3)Cd_(0.7)S via the photoactive species·O_(2)^(-),while the H_(2)is evolved from protons(H^(+))in H_(2)O on the ZB surface of Zn_(0.3)Cd_(0.7)*** work paves a promising road for the production of sustainable energy and products by integrating photocatalysis and biorefine.

关键词： Zn_(x)Cd_(1-x)S homojunction Selective glucose photoreforming Biomass valorization Sustainable H_(2) Photoreforming mechanism

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Electrospinning organic solvent resistant preoxidized poly(acrylonitrile)nanofiber membrane and its properties

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Chinese Journal of Chemical engineering 2023年第1期53卷 289-299页

作者： Zhiwei Du Jinxue Cheng Qinglin Huang Mingxing Chen Changfa Xiao State Key Laboratory of Separation Membranes and Membrane Processes/National Center for International Joint Research on Separation Membranes Tianjin 300387China Department of Material Science and Engineering Tiangong UniversityTianjin 300387China College of Textile and Garments Hebei University of Science and TechnologyShijiazhuang 050018China Fiber Materials Research Center Shanghai University of Engineering ScienceShanghai 201620China

A high performance preoxidized poly(acrylonitrile)(O-PAN)nanofiber membrane with excellent solvent resistance,thermal stability and flexibility was fabricated by the preoxidation of electrospun PAN nanofiber *** performance of resultant O-PAN nanofiber membrane was optimized by altering the PAN concentration and preoxidation *** results showed that the O-PAN nanofiber membrane which made from PAN concentration of 14%(mass)and preoxidation temperature of 250.0℃ have a more optimal comprehensive *** the long-term separation test of SiO2 particle(1 μm)in DMAc suspension,the permeate flux of O-PAN nanofiber membrane stabilized at 227.91 L·m^(-2)·h^(-1)(25℃,0.05 MPa)while the SiO2 rejection above 99.6%,which showed excellent solvent resistance and separation *** order to further explore the application of the O-PAN nanofiber membrane,the OPAN nanofiber membrane was treated with fluoride and used in oil/water separation *** O-PAN nanofiber membrane after hydrophobic treatment showed excellent hydrophobicity and good oil/water separation performance with the permeate flux about 969.59 L·m^(-2)·h^(-1)while the separation efficiency above 96.1%.The O-PAN nanofiber membrane exhibited a potential application prospect in harsh environment separation.

关键词： Poly(acrylonitrile)(PAN) Preoxidation Nanofiber membrane Solvent resistance Oil/water separation

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Spacecraft orbital and attitude control around an Asteroid subjected to underactuated conditions 74

Spacecraft orbital and attitude control around an Asteroid s...

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74th International Astronautical Congress, IAC 2023

作者： Aishashwini Dave, Vishrant Giri, Dipak Kumar Department of Aerospace Engineering IIT Kanpur Uttar Pradesh India Department of Material Science & Engineering IIT Kanpur Uttar Pradesh India

This paper demonstrates the study of designing novel control strategies for a spacecraft's coupled orbital and attitude motion over the vicinity of an irregularly shaped rotating asteroid with a constant angular velocity. The study focuses on high-maneuverability actuator configuration, including a Variable-Speed Control Moment Gyroscope (VSCMG), a reaction wheel, and a single-body-fixed electric thruster. The challenge arises from the inherent limitations of achieving complete position control with this configuration, making this an under-actuated problem. This coupled problem provides high maneuverability with full attitude control and underactuated position control using minimal actuators. To address these complexities, the paper develops a stable Proportional-Derivative (PD) control law for orbital control and employs a nonlinear sliding mode control approach with Quaternions for attitude control. Recognizing the under-actuated nature of the problem, a time separation technique between position and attitude control is utilized, with the closed-loop stability rigorously established through Lyapunov stability criteria. The effectiveness of the proposed control strategies is demonstrated through simulations and theoretical operations near asteroids 433 Eros. Copyright © 2023 by the International Astronautical Federation (IAF). All rights reserved.

关键词： gravity modelling quaternion sliding mode underactuated problem Variable-speed control moment gyroscope (VSCMG)

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Measurement method of the underwater pipe nozzle pose based on monocular vision 6

Measurement method of the underwater pipe nozzle pose based ...

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6th Conference on Frontiers in Optical Imaging and Technology: Imaging Detection and Target Recognition

作者： Wang, Longwang Liu, Wenqi Zhu, Mengjie Zhai, Chao Department of Precision Machinery and Precision Instruments University of Science and Technology of China Anhui Hefei230027 China Experiment Center of Engineering and Material Science University of Science and Technology of China Anhui Hefei230027 China

ISBN: (数字)9781510679733

ISBN: (纸本)9781510679726

Aiming at the problem that it is difficult to accurately locate the underwater circular pipe orifice for the underwater pipe orifice inspection robot, a visual position measurement method for the underwater circular pipe orifice based on the spatial elliptic cone model is designed. Firstly, a simple and easy solution is proposed for the influence of underwater light refraction on camera calibration, and then a set of image processing procedures is proposed for the problems of low recognition rate and poor image quality of underwater orifice images, which can stably extract the edge contour of the underwater orifice. The algorithm process mainly includes the use of bilinear interpolation to narrow the edge transition region, the use of dark channel a priori defogging algorithm to eliminate the image blurring caused by the water body, and the Canny algorithm combined with elliptic filtering to finally get the target orifice contour. Finally, the spatial elliptic cone model is used to calculate the position and attitude of the target orifice in the camera coordinate system. In order to verify the feasibility of this underwater nozzle position measurement method, a positional accuracy measurement device is constructed using a high-precision rotary stage and a translation stage. The experimental results show that the visual localization method designed in this paper has high recognition and localization accuracy, and can meet the needs of practical localization. © 2024 SPIE. All rights reserved.

关键词： Orifices

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