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Hollow cubic MnS-CoS_(2)-NC@NC designed by two kinds of nitrogen-doped carbon strategy for sodium ion batteries with ultraordinary rate and cycling performance

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Nano Research 2022年第4期15卷 3273-3282页

作者： Ruipeng Wei yutao dong Yingying Zhang Xiyang Kang Xia Sheng Jianmin Zhang College of Science Henan Agricultural UniversityZhengzhou 450002China College of Chemistry Zhengzhou UniversityZhengzhou 450001China

In order to obtain an advanced anode material that exhibits excellent electrochemical performance in sodium ion batteries,a hollow nanocube MnS-CoS_(2)-NC@NC(NC=nitrogen-doped carbon)with two kinds of nitrogen-doped carbon was synthesized by simple one-step *** of the two kinds of nitrogen-doped carbon comes from the organic ligands in the precursor being mixed in the sulfide after calcination,and the other comes from the calcination of the coated polydopamine(PDA)to form a carbon shell wrapped outside the *** characteristic nanostructure with two kinds of nitrogen-doped carbon can not only improve the overall conductivity of the electrode material,which is obviously beneficial to the rapid transmission of sodium ions and thus outstanding rate performance,but also can alleviate volume expansion to maintain battery cycle *** the half-cell,the MnS-CoS_(2)-NC@NC electrode not only provides an ultra-high specific capacity of 608.5 mA·h·g^(-1)at 0.2 A·g^(-1)for 100 cycles,but also shows an outstanding rate performance of 560.5 mA·h·g^(-1)at 5.0 A·g^(-1)for 1,100 *** in a full-cell composed with Na3V2(PO4)3 as the positive material,it can still maintain a capacity of 436.7 mA·h·g^(-1)after 900 cycles at 1.0 A·g^(-1).In order to explore its sodium storage mechanism,in-situ and ex-situ X-ray diffraction(XRD)tests were carried out to prove that CoS_(2)and MnS were reduced to produce metallic Co and metallic Mn during the discharging process,respectively,and reversibly returned during the charging process.

关键词： MnS CoS_(2) hollow nanocube nitrogen-doped carbon sodium ion battery

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Insights into the sandwich-like ultrathin Ni-doped MoS_(2)/rGO hybrid as effective sulfur hosts with excellent adsorption and electrocatalysis effects for lithium-sulfur batteries

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Journal of Energy Chemistry 2021年第9期30卷 85-94页

作者： Ran Zhang yutao dong Mohammed AAl-Tahan Yingying Zhang Ruipeng Wei Yuhang Ma Changchun Yang Jianmin Zhang College of Chemistry Green Catalysis CenterZhengzhou UniversityZhengzhou 450001China College of Science Henan Agricultural UniversityZhengzhou 450002China

The design of sulfur hosts with high conductivity,large specific surface area,strong adsorption and electrocatalytic ability is crucial to advance high performance lithium-sulfur ***,a novel ultrathin sandwich-type Ni-doped MoS_(2)/reduced graphene oxide(denote as Ni-doped MoS_(2)/rGO) hybrid is developed as a sulfur host through a simple one-step hydrothermal *** two-dimensional layered structure Ni-doped MoS_(2)/rGO hybrid with heterostructure and heteroatom architecture defects not only plays a key role in adsorption of lithium polysulfide but also catalyzes on redox kinetics of sulfur and polysulfide ***,it can contribute to the large specific surface area for Li_(2) S/S_8 deposition,fast Li-ion and electron transportation,thus enhancing the electrocatalytic properties,as confirmed firstly by cyclic voltammetry(CV) *** to the adsorption-catalytic synergistic effect,the Ni-doped MoS_(2)/rGO cathode exhibits high specific capacity(1343.6 mA h g^(-1) at 0.2 C,921.6 mA h g^(-1) at 1 C),high coulombic efficiency and an outstanding cycle stability(with the low attenuation rate of 0.077% per cycle over 140 cycles at 0.5 C and 0.11% per cycle over 400 cycles at 1 C,respectively).This work proposes some inspiration for exploring the construction of advanced lithium-sulfur batteries through the rational design defects of atomic structure and electronic states of MoS_(2) as sulfur host.

关键词： MoS_(2) Defect Self-assembly Electrocatalysis Lithium-sulfur batteries

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Modulating of MoSe_(2)functional plane via doping-defect engineering strategy for the development of conductive and electrocatalytic mediators in Li-S batteries

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Journal of Energy Chemistry 2022年第12期75卷 512-523,I0013页

作者： Mohammed A.Al-Tahan yutao dong Aml E.Shrshr Xiyang Kang Hui Guan Yumiao Han Zihao Cheng Weihua Chen Jianmin Zhang College of Chemistry Zhengzhou UniversityZhengzhou 450001HenanChina College of Science Henan Agricultural UniversityZhengzhou 450002HenanChina Chemistry Department Faculty of ScienceAl-Azhar UniversityAssiut 71524Egypt

The lithium polysulfide shuttle and sluggish sulfur reaction kinetics still pose significant challenges to lithium-sulfur(Li-S)*** functional plane of Fe-MoSe_(2)@r GO nanohybrid with abundant defects has been designed and applied in Li-S batteries to develop the functional separator and multi-layer sulfur *** cell with a functional separator exhibits a retention capacity of 462 m Ah g^(-1)after the 1000th at 0.5 C and 516 m Ah g^(-1)after the 600th at 0.3 *** at low electrolyte conditions(7.0μL_(mgsulfur)^(-1)and 15μL_(mgsulfur)^(-1))under high sulfur loadings(3.46 mg cm^(-2)and 3.73 mg cm^(-2)),the cell still presents high reversible discharge capacities 679 and 762 m Ah g^(-1)after 70 cycles,***,at sulfur loadings up to 8.26 and 5.2 mg cm^(-2),the cells assembled with the bi-layers sulfur cathode and the tri-layers sulfur cathode give reversible capacities of 3.3 m Ah cm^(-2)after the 100th cycle and 3.0 m Ah cm^(-2)after the 120th cycle,*** research not only demonstrates that the FeMoSe_(2)@r GO functional plane is successfully designed and applied in Li-S batteries with superior electrochemical performances but also paves the novel way for developing a unique multi-layer cathode technique to enhance and advance the electrochemical behavior of Li-S cells at a high-sulfur-loading cathode under lean electrolyte/sulfur(E/S)ratio.

关键词： Lithium-sulfur batteries Modified separator Fe-MoSe_(2)@rGO Multi-layers cathode Defect engineering

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Nanoparticle-Decorated Ultrathin La2O3 Nanosheets as an Effcient Electrocatalysis for Oxygen Evolution Reactions

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Nano-Micro Letters 2020年第4期12卷 41-52页

作者： Guangyuan Yan Yizhan Wang Ziyi Zhang yutao dong Jingyu Wang Corey Carlos Pu Zhang Zhiqiang Cao Yanchao Mao Xudong Wang Department of Material Sciences and Engineering University of Wisconsin-MadisonMadisonWI 53706USA Key Laboratory of Solidification Control and Digital Preparation Technology(Liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024People’s Republic of China MOE Key Laboratory of Materials Physics School of PhysicsZhengzhou UniversityZhengzhou 450001People’s Republic of China

Electrochemical catalysts for oxygen evolution reaction are a critical component for many renewable energy applications. To improve their catalytic kinetics and mass activity are essential for sustainable industrial applications. Here, we report a rare-earth metal-based oxide electrocatalyst comprised of ultrathin amorphous La2O3 nanosheets hybridized with uniform La2O3 nanoparticles(La2O3@NP-NS). Significantly improved OER performance is observed from the nanosheets with a nanometer-scale thickness. The as-synthesized 2.27-nm La2O3@NP-NS exhibits excellent catalytic kinetics with an overpotential of 310 mV at 10 m A cm^-2, a small Tafel slope of 43.1 mV dec^-1, and electrochemical impedance of 38 Ω. More importantly, due to the ultrasmall thickness, its mass activity, and turnover frequency reach as high as 6666.7 A g^-1 and 5.79 s^-1, respectively, at an overpotential of 310 mV. Such a high mass activity is more than three orders of magnitude higher than benchmark OER electrocatalysts, such as IrO2 and RuO2. This work presents a sustainable approach toward the development of highly e cient electrocatalysts with largely reduced mass loading of precious elements.

关键词： Oxygen evolution reaction Multiphase hybrid Two-dimensional nanomaterials Rare-earth oxides Ionic layer epitaxy

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渐开线圆柱齿轮副侧隙的几何模型及公式

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机械传动 2014年第9期38卷 99-101页

作者：董玉涛五矿邯邢矿业公司北洺河铁矿河北邯郸056002

从侧隙定义出发,以外啮合渐开线直齿圆柱齿轮副为例,从几何学的角度分析了齿轮啮合的过程,给出了法向侧隙、圆周侧隙所对应的几何量,推导了的法向侧隙的定义式、对称式,讨论了法向侧隙的一些性质和特点。

关键词：渐开线侧隙法向齿轮副

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Fabrication of TiO2 Nanotube / graphene Composite and Evaluation on its Electrochemical Performances

Fabrication of TiO2 Nanotube / graphene Composite and Evalua...

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河南省化学会2016年学术年会

作者： Yake Li Yushan Liu Dan Li yutao dong Jianmin Zhang College of Chemistry and Molecular Engineering Zhengzhou University

In this work,the nanotube titania/graphene composites were prepared via in-situ colloid electrostatic salf-assembly process,followed by a 550℃calcination under high N2 concentration *** electron microscopy(TEM),Fouri...

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Resonance mechanism of flapping wing based on fluid structure interaction simulation

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Chinese Journal of Aeronautics 2024年第5期37卷 243-262页

作者： Yueyang GUO Wenqing YANG Yuanbo dong dong XUE National Key Laboratory of Science and Technology on Aerodynamic Design and Research School of AeronauticsNorthwestern Polytechnical UniversityXi'an 710072China Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518063China Yangtze River Delta Research Institute of Northwestern Polytechnical University Taicang 215400China

Certain insect species have been observed to exploit the resonance mechanism of their *** order to achieve resonance and optimize aerodynamic performance,the conventional approach is to set the flapping frequency of flexible wings based on the Traditional Structural Modal(TSM)***,there exists controversy among researchers regarding the relationship between frequency and aerodynamic *** that the structural response of wings can be influenced by the surrounding air vibrations,an analysis known as Acoustic Structure Interaction Modal(ASIM)is introduced to calculate the resonant *** this study,Fluid Structure Interaction(FSI)simulations are employed to investigate the aerodynamic performance of flapping wings at modal frequencies derived from both TSM and ASIM *** performance is evaluated for various mass ratios and frequency ratios,and the findings indicate that the deformation and changes in vortex structure exhibit similarities at mass ratios that yield the highest aerodynamic ***,the flapping frequency associated with the maximum time-averaged vertical force coefficient at each mass ratio closely aligns with the ASIM frequency,as does the frequency corresponding to maximum ***,the ASIM analysis can provide an effective means for predicting the optimal flapping frequency for flexible ***,it enables the prediction that flexible wings with varying mass ratios will exhibit similar deformation and vortex structure *** paper offers a fresh perspective on the ongoing debate concerning the resonance mechanism of Flexible Flapping Wings(FFWs)and proposes an effective methodology for predicting their aerodynamic performance.

关键词： Flexible Flapping Wing(FFW) Acoustic Structure Interaction Modal(ASIM) Fluid Structure Interaction(FSI) Resonance mechanism Aerodynamic performance

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谈老街意象的重塑——以绍兴府河街改造为例

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建筑与文化 2022年第1期 121-122页

作者：董宇涛浙江工商大学

如何在城市化快速进程中更新与改造老街是目前中国城市所面临的重要问题。随着新型商业街的建设,老街传统形式遭到破坏,市民记忆中的老街意象逐渐消失。老街应该是城市过去的辉煌、当下的财富和未来的希望。文章以绍兴府河街作为研究对... 详细信息

如何在城市化快速进程中更新与改造老街是目前中国城市所面临的重要问题。随着新型商业街的建设,老街传统形式遭到破坏,市民记忆中的老街意象逐渐消失。老街应该是城市过去的辉煌、当下的财富和未来的希望。文章以绍兴府河街作为研究对象,通过实地调查、街区文化研究和优秀案例分析,从功能多样化、设施人性化和景观丰富化三个方面对老街的文化、公共空间和街道生活进行思考,旨在打造老街人性化活动空间和实现老街可持续发展。

关键词：老街意象更新与改造人性化府河街

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Copper slag assisted coke reduction of phosphogypsum for sulphur dioxide preparation

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Chinese Journal of Chemical Engineering 2024年第1期65卷 43-53页

作者： dong Ma Qinhui Wang State Key Laboratory of Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou 310027China

The reduction of phosphogypsum(PG)to lime slag and SO_(2)using coke can effectively alleviate the environmental problems caused by ***,the PG decomposition temperature remains high and the product yield remains *** adding additives,the decomposition temperature can be further reduced and PG decomposition rate and product yield can be ***,the use of current additives such as Fe_(2)O_(3)and SiO_(2)brings the problem of increasing economic ***,it is proposed to use solid waste copper slag(CS)as a new additive to reduce PG to prepare SO2,which can reduce the cost and meet the environmental benefits at the same *** effects of proportion,temperature and thermostatic time on PG decomposition are investigated by experimental and kinetic analysis combined with FactSage thermodynamic calculations to optimize the roasting ***,the reaction mechanism is *** is found that adding CS to the coke and PG system can increase the rate of PG decomposition and SO_(2)yield while lowering the PG decomposition *** example,when the CS/PG mass ratio increases from 0 to 1,PG decomposition rate increases from 83.38%to 99.35%,SO_(2)yield increases from 78.62%to 96.81%,and PG decomposition temperature decreases from 992.4℃to 949.6℃.The optimal reaction parameters are CS/PG mass ratio of 1,Coke/PG mass ratio of 0.06 at 1100℃for 20 min with 99.35%PG decomposition rate and 96.81%SO_(2) *** process proceeds according to the following reactions:2CaSO_(4)+ 0.7C + 0.8Fe_(2)SiO_(4)→0.8Ca_(2)SiO_(4)+ 0.2Ca_(2)Fe_(2)O_(5)+ 0.4Fe_(3)O_(4)+2SO_(2)+ 0.7CO_(2)Finally,a process for decomposing PG with coke and CS is proposed.

关键词： Phosphogypsum Sulfur dioxide Copper slag Fluidized-bed Reduction Waste treatment

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Resilient control of flexible hypersonic vehicles against unmatched distributed faults

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Chinese Journal of Aeronautics 2024年第5期37卷 60-70页

作者： dong ZHAO Wenjing REN School of Artificial Intelligence Anhui UniversityHefei 230601China Key Laboratory of System Control and Information Processing Ministry of EducationShanghai Jiao Tong UniversityShanghai 200240China School of Electrical Engineering and Automation Hefei University of TechnologyHefei 230009China

This paper studies a robust fault compensation and vibration suppression problem of flexible hypersonic *** controlled plant is represented by a cascade system composed of a nonlinear Ordinary Differential Equation(ODE)and an Euler-Bernoulli Beam Equation(EBBE),in which the vibration dynamics is coupled with the rigid dynamics and suffers from distributed faults.A state differential transformation is introduced to transfer distributed faults to an EBBE boundary and a longitudinal dynamics is refined by utilizing T-S fuzzy IF-THEN rules.A novel T-S fuzzy based fault-tolerant control algorithm is developed and related stability conditions are *** robust exponential stability and well-posedness are proved by using the modified l_(0)-semigroup based Lyapunov direct approach.A simulation study on the longitudinal dynamics of flexible hypersonic vehicles effectively verifies the validity of the developed theoretical results.

关键词： Flexible hypersonic vehicles ODE-EBBE cascade Robust exponential stability Unmatched distributed fault compensation Vibration suppression

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