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Controllable selective anchoring of subnanometric Ru clusters or single-atoms/clusters on tungsten nitride for the hydrogen oxidation

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Science China Chemistry 2024年第11期67卷 3749-3756页

作者： Qijiao sun Chuanqiang Wu yiqiang sun Yuan Shen Lei Zhao Xiaodong Yang Li Yang Yunxiang Lin Keke Mao Kun Xu School of Chemistry and Chemical Engineering Key Laboratory of Functional Inorganic Material Chemistry of Anhui Province Anhui Province Key Laboratory of Chemistry for Inorganic/Organic Hybrid Functionalized Materials Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education Anhui University Information Materials and Intelligent Sensing Laboratory of Anhui Province Institutes of Physical Science and Information TechnologyAnhui University School of Chemistry and Chemical Engineering University of Jinan School of Energy and Environment Anhui University of Technology

The impregnation method in the preparation of metal cluster catalysts typically inadvertently introduces single atoms（SAs） into the substrate. However, the question of whether the introduction of SAs will further improve the catalytic activity of cluster systems for specific reactions such as the hydrogen oxidation reaction（HOR） remains unraveled. Herein, we demonstrate Ru clusters anchored on WN nanowires（RuC/WN） show a higher alkaline HOR catalytic activity in comparison with Ru SAs and nanoclusters（NCs）-coupled catalyst anchored on WN nanowires system（RuC,S/WN）. Notably, the RuC/WN exhibits superb intrinsic catalytic activity with a mass-normalized exchange current density of 890 m A mg-1PGM, which is among the top level of well developed Ru-based HOR catalysts. Both theoretical simulation and experimental investigation suggest that RuC/WN owns an optimized H*and OH*reaction intermediates for the alkaline HOR, therefore resulting in the excellent intrinsic HOR catalytic performance.

关键词： hydrogen oxidation reaction Ru cluster catalyst Ru single atoms and nanoclusters coupled catalyst tungsten nitride substrate

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In-situ template etching synthesis of BiON/BiOCl_(0.9)I_(0.1) heterojunction for photocatalytic degradation of tetracycline

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ChemPhysMater 2024年第1期3卷 103-110页

作者： Xiaodong Yang Qi Shen Wenwen Cao Bo Xu yiqiang sun Cuncheng Li School of Chemistry and Chemical Engineering University of JinanJinan 250022China

Hierarchical heterostructures have emerged as promising candidates for the efficient photocatalytic degradation of antibiotics owing to their matched energy levels and tunable absorption ***,we report the facile synthesis of a heterojunction photocatalyst composed of basic bismuth nitrate(BiON)and BiOCl_(0.9)I_(0.1) using a simple room-temperature hydrolysis *** results demonstrate that the BiON/BiOCl_(0.9)I_(0.1) composite exhibits superior photodegradation performance compared to pure-phase materials owing to the catalytic enhancement at the heterointerface and the effective separation of the photogenerated ***,the unique three-dimensional microsphere morphology of the synthesized composite enhances its specific surface area and light absorption,further enhancing its photocatalytic *** the tetracycline(TC)photodegradation reaction as a model reaction,the catalyst could degrade 88%of TC in just 25 ***,this work provides a promising strategy for the facile and low-cost synthesis of heterogeneous photocatalytic degradation materials.

关键词： Heterojunction Tetracycline reduction Visible light Photocatalysis

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临边观测下火箭喷焰红外辐射可探测性分析

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工程热物理学报 2024年第4期45卷 1090-1096页

作者：孙一强牛青林贺志宏董士奎哈尔滨工业大学空天热物理工业和信息化部重点实验室哈尔滨150001 中北大学机电工程学院太原030051

本文针对空基平台大气层内、天基平台水平、短路径和长路径四种临边观测体制下,分析不同高度上火箭喷焰的点源红外信号在MWIR(3.70-4.80μm)和LWIR(7.70-9.50μm)波段大气窗口区的可探测性。采用视在光线法(LOS)求解火箭喷焰点源本征辐... 详细信息

本文针对空基平台大气层内、天基平台水平、短路径和长路径四种临边观测体制下,分析不同高度上火箭喷焰的点源红外信号在MWIR(3.70-4.80μm)和LWIR(7.70-9.50μm)波段大气窗口区的可探测性。采用视在光线法(LOS)求解火箭喷焰点源本征辐射,并考虑大气透过率、背景计算在不同平台下目标与背景的辐射对比度CR。在以探测器瞬时视场为1 km×1 km,最低的辐射对比度C(R)=0.02为界限以分析点源目标的可探测性。结果表明四种探测方式在MWIR波段的辐射对比度基本上大于0.02;在LWIR波段,空基平台和天基平台短路径探测在的辐射对比度在<70 km大于0.02,长路径探测在<40 km的高度范围内大于0.02,天基平台水平探测在各个高度上均大于0.02;MWIR波段的可探测性能要优于LWIR波段。

关键词：红外辐射发动机喷焰临边观测辐射对比度

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Shear strength of frozen clay under freezing-thawing cycles using triaxial tests

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Earthquake Engineering and Engineering Vibration 2018年第4期17卷 761-769页

作者： Wang Miao Meng Shangjiu sun yiqiang Fu Haiqing Institute of Engineering Mechanics China Earthquake Administration Harbin 150080 China Key Laboratory of Earthquake Engineering and Engineering Vibration China Earthquake Administration College of Civil Engineering andArchitecture Harbin University of Science and Technology Harbin 150080 China Shandong Earthquake Administration Jinan 250014 China

Using a new low-temperature dynamic triaxial apparatus, the influence law of freezing-thawing cycles on clay shear strength is studied. In this research, the concept of correction coefficients of freezing-thawing cycles on clay static strength, cohesion and internal friction angles is proposed, and the change patterns, correction curves and regressive formulae of clay static strength, cohesion and internal friction angles under freezing-thawing cycles are given. The test results indicate that with increasing numbers of freezing-thawing cycles, the clay static strength and cohesion decrease exponentially but the internal friction angle increases exponentially. The performance of static strength, cohesion and internal friction angles are different with increasing numbers of freezing-thawing cycles, i.e., the static strength decreases constantly until about 30% of the initial static strength prior to the freezing-thawing cycling and then stays basically stable. After 5-7 freezing-thawing cycles, the cohesion decreases gradually to about 70% of the initial cohesion. The internal friction angle increases about 20% after the first freezing-thawing cycle, then increases gradually close to a stable value which is an increase of about 40% of the internal friction angle. The freezing-thawing process can increase the variation of the density of the soil samples; therefore, strict density discreteness standards of frozen soil sample preparation should be established to ensure the reliability of the test results.

关键词： seasonally frozen soil freezing-thawing cycles cohesion internal friction angle correction coefficient

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Anion-cation dual doping: An effective electronic modulation strategy of Ni2P for high-performance oxygen evolution

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Journal of Energy Chemistry 2020年第9期29卷 116-121,I0004页

作者： Bo Xu Xiaodong Yang Qiang Fang Linbing Du Yan Fu yiqiang sun Qisheng Liu Qingquan Lin Cuncheng Li School of Chemistry and Chemical Engineering University of JinanJinan 250022ShandongChina Institute of Applied Catalysis College of Chemistry and Chemical EngineeringYantai UniversityYantai 264005ShandongChina

Developing of high-performance and low-cost electrocatalysts is of great significance to reduce the overpotential and accelerated the reaction rate of oxygen evolution in water splitting and related energy conversion ***,Fe,O-dual doped Ni2P(Fe,O-Ni2P)nanoarray is successfully synthesized on carbon cloth demonstrating enhanced electrocatalytic activity and stability for oxygen evolution reaction(OER)under alkaline *** as-synthesized Fe,O-Ni2P nanoarray exhibits obviously improved OER performance with a low overpotential of 210 mV at 10 mA cm^-2 current density and a Tafel slope of48 mV dec^-1,as well as long-term *** strong coupling interaction induced changes in electronic structure lead to relatively higher oxidation state and stronger oxidation ability of the Fe,O-Ni2P nanoarray,together with the high electrochemical surface area and good conductivity contribute to the superior OER *** work highlights the anion-cation dual doping strategy may be an effective method for fabrication of catalysts relating to energy conversion applications.

关键词： Oxygen evolution reaction Ni2P based electrocatalyst Anion-cation dual doping

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SOME RESULTS OF UPPER ATMOSPHERIC COMPOSITION MEASUREMENTS BY A MASS-SPECTROMETER ON BOARD "SZ-2":CHANGE OF COMPOSITIONS DURING SOLAR AND GEOMAGNETIC DISTURBANCES

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空间科学学报 2002年第Z1期22卷 42-48页

作者： QIN Guotai QIU Shiyan HE Aiqing ZHU yiqiang sun Lilin LIN Xianwen LI Hong XU Xuepei Center for Space Science and Applied Research The Chinese Academy of Sciences Beijing 100080 P.R. China Center for Space Science and Applied Research The Chinese Academy of Sciences Beijing 100080 P.R. China Center for Space Science and Applied Research The Chinese Academy of Sciences Beijing 100080 P.R. China Center for Space Science and Applied Research The Chinese Academy of Sciences Beijing 100080 P.R. China Center for Space Science and Applied Research The Chinese Academy of Sciences Beijing 100080 P.R. China Center for Space Science and Applied Research The Chinese Academy of Sciences Beijing 100080 P.R. China Center for Space Science and Applied Research The Chinese Academy of Sciences Beijing 100080 P.R. China Center for Space Science and Applied Research The Chinese Academy of Sciences Beijing 100080 P.R. China

Upper atmosphere composition data were obtained for the last half year with a quadruple mass spectrometer on board spacecraft "SZ-2" launched on 10 Jan uary 2001. Based on the analysis of these data, the variations of atmospheric compositions in solar and geomagnetic quiet conditions are reported first, then a detailed discussion on the atmospheric composition variations under the so lar and geomagnetic disturbed conditions is given. The results show that near the altitude of 400 km the variations of main atmospheric compositions corre sponding to solar disturbances are more remarkable in the sunlit area than in the shade area. On the contrary, in geomagnetic disturbance events the corre sponding variations are more obvious in the shade area, an evident increase of N2 density at relatively higher latitudes was observed.

关键词： Solar activity, Geomagnetic activity, Atmospheric composition

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Time-delay identification for linear controlled systems

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Theoretical & Applied Mechanics Letters 2013年第6期3卷 51-54页

作者： yiqiang sun Hanwen Song Jian Xu School of Aerospace Engineering and Applied Mechanics Tongji University

A new approach for time-delay identification is proposed in linear controlled systems. The delay is derived from the control loop in the system. The frequency-response function of the system is presented in terms of the impedance matrix. It is proved that the inverse form of the function may be expressed in the harmonic function, which is used to fit those data from the experiment. As an example, an isolator with the delayed feedback control is schemed to acquire such data. Using least square algorithm yields that the identified delay can reach any required accuracy.

关键词： time-delay identification active control delayed isolator signal processing

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Cr含量对65Mn钢淬透性的影响

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金属热处理 2020年第7期45卷 163-166页

作者：孙宜强宝钢中央研究院湖北武汉430080

为研究Cr对65Mn钢淬透性的影响,进行了Cr含量0%~0.5%(质量分数)的四组试样的末端淬火试验,对淬火试样进行了洛氏硬度和组织检验。试验结果表明:随着与试样淬火端部距离的增加,即淬火冷却速度的降低,末端淬火试样组织中马氏体含量由100%... 详细信息

为研究Cr对65Mn钢淬透性的影响,进行了Cr含量0%~0.5%(质量分数)的四组试样的末端淬火试验,对淬火试样进行了洛氏硬度和组织检验。试验结果表明:随着与试样淬火端部距离的增加,即淬火冷却速度的降低,末端淬火试样组织中马氏体含量由100%降低到0%,硬度由62 HRC降低到23 HRC;Cr元素明显提高65Mn钢的淬透性,0.1%的Cr含量添加约提高50%的淬硬层深度。

关键词： 65Mn钢 Cr 淬透性末端淬火

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A non-smooth model of gear vibration

A non-smooth model of gear vibration

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23rd International Congress of Theoretical and Applied Mechanics

作者： Jianming Wen Xiangrong Zhou yiqiang sun School of Aerospace Engineering and Applied Mechanics Tongji University Shanghai Marine Equipment Research Institute

＜正＞Gear transmission is extensively used in all kinds of mechanical system because of its high efficiency and *** fact,the transmission produces noise and *** this paper,marine gear rubber coupling was as the engin...

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FeOOH-Ni(OH)2复合材料的制备及其电催化析氧性能

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复合材料学报 2020年第8期37卷 1944-1950页

作者：涂言言赵子涵孙一强济南大学化学化工学院济南250022

以碳纤维布(CFC)为基底,通过两步法(恒电流电沉积法、溶剂热法)成功制备了FeOOH-Ni(OH)2复合材料。与FeOOH和Ni(OH)2相比,该FeOOH-Ni(OH)2复合材料作为电催化剂时,电催化析氧反应(OER)活性显著提高。在1 mol/L KOH电解质溶液中,达到10 m... 详细信息

以碳纤维布(CFC)为基底,通过两步法(恒电流电沉积法、溶剂热法)成功制备了FeOOH-Ni(OH)2复合材料。与FeOOH和Ni(OH)2相比,该FeOOH-Ni(OH)2复合材料作为电催化剂时,电催化析氧反应(OER)活性显著提高。在1 mol/L KOH电解质溶液中,达到10 mA·cm^-2电流密度时所需要的过电位仅为270 mV,Tafel斜率为78 mV/dec,电化学阻抗谱进一步揭示了电解过程中良好的动力学特性。FeOOHNi(OH)2复合材料在碱性介质中具有优异的稳定性,其在高电流密度下(50 mA·cm^-2)的过电势经过连续24 h的测试之后几乎没有发生明显变化。FeOOH和Ni(OH)2之间的强电子相互作用和协同效应有效提高了电导性,促进了电荷转移;此外,这种核壳结构有效增强了电催化活性面积,进而增强了其电催化析氧性能。

关键词： FeOOH-Ni(OH)2复合材料核壳结构协同效应电催化析氧反应

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