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Transient synthesis of carbon-supported high-entropy alloy sulfide nanoparticles via flash Joule heating for efficient electrocatalytic hydrogen evolution

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Nano Research 2024年第4期17卷 3379-3389页

作者： Yuntian Liao Rongtao Zhu wenjun Zhang Haiyang Zhu Yang Sun Jiale Chen Zhenhua Dong Ronghuan lv School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116China

High entropy alloys(HEA)are frequently employed as catalysts in electrocatalytic hydrogen evolution.However,the traditional high entropy alloy synthesis methods are time-consuming,energy-intensive,and environmentally polluting,which limits their application in the hydrogen evolution reaction(HER).This study leveraged the capabilities of flash Joule heating(FJH)to synthesize carbon-supported high-entropy alloy sulfide nanoparticles(CC-S-HEA)on carbon cloth(CC)with good self-standing properties within 300 ms.The carbon thermal shock generated by the Joule heating could pyrolyze the sulfur source into gas,resulting in numerous pore structures and defects on CC,forming an S-doped carbon substrate(CC-S).Then the S atoms were used to stably anchor the metal atoms on CC-S to form high-density uniformly dispersed HEA particles.The electrochemical test results demonstrated that CC-S-HEA prepared at 60 V flash voltage had HER performance comparable to Pt/C.The density functional theory(DFT)calculation indicated that the S atoms on CC-S accelerated the electron transfer between the carbon substrate and HEA particles.Moreover,the unique electronic structure of CC-S-HEA was beneficial to H*adsorption and promoted catalytic kinetics.The simplicity and versatility of FJH synthesis are of great significance for optimizing the synthesis of HEA and improving the quality of HEA products,which provides a broad application prospect for the synthesis of nanocatalysts with efficient HER performance.

关键词： high entropy alloy flash Joule heating carbon thermal shock hydrogen evolution reaction density functional theory

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Self-Tuning Asynchronous Filter for Linear Gaussian System and Applications

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IEEE/CAA Journal of Automatica Sinica 2018年第6期5卷 1054-1061页

作者： wenjun lv Yu Kang Yunbo Zhao Department of Automation University of Science and Technology of ChinaHefei 230027China State Key Laboratory of Fire Science Department of Automation and Institute of Advanced TechnologyUniversity of Science and Technology of ChinaHefei 230027China Key Laboratory of Technology in GeoSpatial Information Processing and Application System Chinese Academy of SciencesBeijing 100190China College of Information Engineering Zhejiang University of TechnologyHangzhou 310023China

In this paper, optimal filtering problem for a class of linear Gaussian systems is studied. The system states are updated at a fast uniform sampling rate and the measurements are sampled at a slow uniform sampling rate. The updating rate of system states is several times the sampling rate of measurements and the multiple is constant. To solve the problem,we will propose a self-tuning asynchronous filter whose contributions are twofold. First, the optimal filter at the sampling times when the measurements are available is derived in the linear minimum variance sense. Furthermore, considering the variation of noise statistics, a regulator is introduced to adjust the filtering coefficients adaptively. The case studies of wheeled robot navigation system and air quality evaluation system will show the effectiveness and practicability in engineering.

关键词：最优滤波噪声统计量机器人自动化系统

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FVO: floor vision aided odometry

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Science China(Information Sciences) 2019年第1期62卷 95-107页

作者： wenjun lv Yu KANG Jiahu QIN Department of Automation University of Science and Technology of China State Key Laboratory of Fire Science University of Science and Technology of China

In many indoor scenarios, such as restaurants, laboratories, and supermarkets, the planar floors are covered with rectangular tiles. We realized that the abundant parallel lines and crossing points formed by tile joints can be used as natural features to assist indoor localization, and thus we propose a novel indoor localization method for mobile robots by fusing odometry and monocular vision. The method comprises three steps. First, the heading and location of the mobile robot are approximately estimated by odometry based on incremental encoders. Second, with the aid of a camera, the lens of which points vertically toward the floor, the odometric heading estimation can be corrected by detecting the relative angle between the robot’s heading and the tile joints. Third, the odometric location estimation is corrected by detecting the perpendicular distance between the image center and the tile joints. As compared with the existing indoor localization methods, the proposed method, called floor vision aided odometry, is not only relatively low in economic cost and computational complexity, but also relatively high in accuracy and robustness. The effectiveness of this method is verified by a real-world experiment based on a differential-drive wheeled mobile robot.

关键词： mobile robot indoor localization monocular vision odometry tile joint

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发展制造业生成式人工智能的相对视角与业务路径

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中国仪器仪表 2024年第5期 22-26页

作者：傅文军吕骏屠宇飞浙江移动信息系统集成有限公司浙江杭州310006 国家税务总局杭州市税务局浙江杭州310009

生成式人工智能作为制造业实现数字化转型的新兴驱动力,具有重要的战略意义。为了更好地推动生成式人工智能在制造业的发展,需要从多个视角进行分析和探讨。本文通过梳理人工智能发展历程并提取标志性成果作为基本视角,利用相对视角的... 详细信息

生成式人工智能作为制造业实现数字化转型的新兴驱动力,具有重要的战略意义。为了更好地推动生成式人工智能在制造业的发展,需要从多个视角进行分析和探讨。本文通过梳理人工智能发展历程并提取标志性成果作为基本视角,利用相对视角的构建促进其业务体系初步形成。在推动制造业生成式人工智能方面,需要以区域现状作为发展的基本逻辑,完成供需分析和生态协同的建设路径,推动生成式人工智能与制造业的深度融合,实现制造业的数字化转型和高质量发展。

关键词：生成式人工智能相对视角业务体系发展阶段

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Cathode infiltration with enhanced catalytic activity and durability for intermediate-temperature solid oxide fuel cells

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Chinese Chemical Letters 2022年第2期33卷 674-682页

作者： Yinghua Niu Weirong Huo Yuandong Yu wenjun Li Yulin Chen Weiqiang lv Yangtze Delta Region Institute(Huzhou)&School of Physics&School of Materials and Energy University of Electronic Science and Technology of ChinaHuzhou 313001China School of Materials Science and Engineering Tianjin University of TechnologyTianjin 300384China

To lower the operation temperature and increase the durability of solid oxide fuel cells(SOFCs), increasing attentions have been paid on developing cathode materials with good oxygen reduction reaction(ORR)activity at intermediate-temperature(IT, 500-750 ℃) range. However, most cathode materials exhibit poor catalytic activity, or they thermally mismatch with SOFC electrolytes and undergo severe degeneration. Infiltrating catalysts on existing backbone materials has been proved to be an efficient method to construct highly active and durable cathodes. In this mini-review, the advantages of infiltration-based cathode compared with new material-based cathodes are summarized. The merits and drawbacks of different backbones are illustrated. Different types of catalysts for infiltration are depicted in detail. Suggestions on the material/structure optimization of the infiltrated cathodes of IT-SOFC are provided.

关键词： Infiltration Cathode Solid oxide fuel cell Oxygen oxidation reaction Durability

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Effect of SiO_(2) nano film deposited on copper and aluminium electrodes on the power frequency breakdown voltage of SF_(6) gas

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High Voltage 2023年第4期8卷 791-798页

作者： Yu Zheng Shengle Gong Lei Liu Zhihui Xiang Yichen lv Jianhui Yu wenjun Zhou School of Electrical Engineering and Automation Wuhan UniversityWuhanChina State Key Laboratory of HVDC Transmissions Technology China Southern Power GridGuangzhouChina

In order to reveal the effect of insulating nano film on the insulation strength of SF_(6) gas gap,SiO_(2) nano film was deposited on the electrode surface by the plasma-enhanced chemical vapour deposition technique.The power frequency breakdown characteristics of SF_(6) gas under Cu and Al electrodes were obtained before and after coating.The results showed that when the Cu electrode was coated,the breakdown voltage was up to at most 11.5% higher than that of an uncoated Cu electrode in the pressure range of 0.2-0.5 MPa.When the Al electrode was coated,the breakdown voltage of SF_(6) gas was lower than that of an uncoated one in the pressure range of 0.2-0.5 MPa.The breakdown voltage of SF_(6) gas under the Cu electrode was slightly lower than that under the Al electrode,but the breakdown voltages under the coated Cu electrode were significantly higher than that under the coated Al electrode.Through SEM tests,it was found that the surface roughness of the electrode decreases after coating,but particles were formed on the surface of the Al electrode.The content of metal fluoride formed on the coated Al electrode under multiple breakdowns was significantly higher than that on the coated Cu electrode.The research results could provide references for improving insulation performance of GIS equipment.

关键词： coating electrode film

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Genotypic Diversity Affects Age Structure of Tiller and Rhizome of Leymus chinensis Population,But Not Age Structure of Bud

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Phyton-International Journal of Experimental Botany 2023年第11期92卷 3163-3176页

作者： Chan Zhou Nini Xie wenjun Rong Zhuo Zhang Linyou lv Zhengwen Wang School of Life Science Liaoning UniversityShenyang110036China School of Life Science and Bioengineering Shenyang UniversityShenyang110044China Research Institute of Sand Control and Utilization Fuxin123000China State Key Laboratory of Forest and Soil Ecology Institute of Applied EcologyChinese Academy of SciencesShenyang110164China

The effect of genotypic diversity on the age structure and bud bank of the Leymus chinensis population has not yet been demonstrated.This experiment was designed to study the age structure of the tiller,rhizome,and bud of L.chinensis at genotypic diversity levels of 1,2,4,8,and 12.A total of 64 communities were established in this experiment,following the principle of randomized block experimental design.The results indicated that genotypic diversity had a significant or obviously significant effect on the cumulative length of rhizomes of 2a and 4a,dry matter accumulation of rhizomes of 1a and 2a,tiller number of 1a,tiller productivity of 3a,but had no significant effect age structure of buds.As the levels of genotypic diversity increased,the proportion of the cumulative length of rhizomes with 4a decreased and then increased,and dry matter accumulation of rhizomes with 1a and 2a gradually increased while the number of tillers with 1a gradually decreased,when the gradient of genotypic diversity increased.At the 1,2,4,8,and 12 genotype diversity levels,the number of tillers,the cumulative length of rhizomes,and dry matter accumulation in rhizomes and buds were all age structures of expanding type.However,tiller productivity was an expanding or stable age structure at levels of 1,2,4,8 genotypic diversity,while it was a declining age structure at the 12 genotype diversity gradient.An appropriate genotypic diversity is conducive to maintaining the growth and stability of the age structure of L.chinensis population,but too high a gradient of genotypic diversity can have a negative impact on the population age structure.This study provided that an appropriate number of genotypic diversity contributes to the stability of the population.

关键词： Genotypic diversity L.chinensis age structure population

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LiFePO_(4) as a dual-functional coating for separators in lithium-ion batteries:A new strategy for improving capacity and safety

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Journal of Energy Chemistry 2023年第11期86卷 490-498,I0010页

作者： Modeste Venin Mendieev Nitou Yashuai Pang Zhao Wan wenjun Li Zhuohang Zhong Waqas Muhammad Saeed Muhammad Sohail Muhammad Yinghua Niu Weiqiang lv School of Physics University of Electronic Science and Technology of ChinaChengdu 611731SichuanChina Yangtze Delta Region Institute(Huzhou) University of Electronic Science and Technology of ChinaHuzhou 313001ZhejiangChina

Lithium-ion batteries(LIBs)require separators with high performance and safety to meet the increasing demands for energy storage applications.Coating electrochemically inert ceramic materials on conventional polyolefin separators can enhance stability but comes at the cost of increased weight and decreased capacity of the battery.Herein,a novel separator coated with lithium iron phosphate(LFP),an active cathode material,is developed via a simple and scalable process.The LFP-coated separator exhibits superior thermal stability,mechanical strength,electrolyte wettability,and ionic conductivity than the conventional polyethylene(PE)separator.Moreover,the LFP coating can actively participate in the electrochemical reaction during the charge-discharge process,thus enhancing the capacity of the battery.The results show that the LFP-coated separator can increase the cell capacity by 26%,and improve the rate capability by 29%at 4 C compared with the conventional PE separator.The LFP-coated separator exhibits only 1.1%thermal shrinkage at 140°C,a temperature even above the melting point of PE.This work introduces a new strategy for designing separators with dual functions for the next-generation LIBs with improved performance and safety.

关键词： Lithium-ion batteries Separator Surface-coating LiFePO_(4) Safety

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Cerium-based nanoparticles for cancer photodynamic therapy

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Journal of Innovative Optical Health Sciences 2022年第6期15卷 4-16页

作者： Hui Li Min Wei Xinyi lv Yanling Hu Jinjun Shao Xuejiao Song Dongliang Yang wenjun Wang Buhong Li Xiaochen Dong Key Laboratory of Flexible Electronics(KLOFE)and Institute of Advanced Materials(IAM)School of Physical and Mathematical Sciences Nanjing Tech University(NanjingTech)NanjingJiangsu 211816P.R.China School of Physical Science and Information Technology Liaocheng University LiaochengShandong 252059P.R.China MOE Key Laboratory of OptoElectronic Science and Technology for Medicine Fujian Provincial Key Laboratory of Photonics Technology Fujian Normal University FuzhouFujian 350117P.R.China School of Chemistry&Materials Science Jiangsu Normal University Xuzhou Jiangsu 221116P.R.China

Metal-and metal-oxide-based nanoparticles have been widely exploited in cancer photodynamic therapy(PDT).Among these materials,cerium-based nanoparticles have drawn extensive attention due to their superior biosafety and distinctive physicochemical properties,especially the reversible transition between the valence states of Ce(Ⅲ)and Ce(Ⅳ).In this review,the recent advances in the use of cerium-based nanoparticles as novel photosensitizers for cancer PDT are discussed,and the activation mechanisms for electron transfer to generate singlet oxygen are presented.In addition,the types of cerium-based nanoparticles used for PDT of cancer are summarized.Finally,the challenges and prospects of clinical translations of cerium-based nanoparticles are briefly addressed.

关键词： Photodynamic therapy photosensitizer cerium reactive oxygen species

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‘YY021’烘烤特性及其杂种优势

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中国农学通报 2024年第9期40卷 42-47页

作者：孙计平王亚乐李丽华李雪君吕文钧孙焕河南省农业科学院烟草研究所河南许昌461000 河南省烟草公司洛阳市公司河南洛阳471000

为研究烤烟杂交种‘YY021’的烘烤特性及杂种优势,以‘YY021’及其母本‘MSY106’、父本‘LY1306’为研究对象,采用暗箱试验研究上部烟、中部烟和下部烟的变黄、变褐特性;采用电烤箱试验,研究中部烟烘烤过程中烟叶的失水特性、叶绿素降... 详细信息

为研究烤烟杂交种‘YY021’的烘烤特性及杂种优势,以‘YY021’及其母本‘MSY106’、父本‘LY1306’为研究对象,采用暗箱试验研究上部烟、中部烟和下部烟的变黄、变褐特性;采用电烤箱试验,研究中部烟烘烤过程中烟叶的失水特性、叶绿素降解特性和多酚氧化酶(PPO)活性变化,评价‘YY021’易烤性和耐烤性及其杂种优势。结果表明,上、中、下部位叶片变黄速率均表现为‘YY021’>‘LY1306’>‘MSY106’,下部和中部烟叶变褐速率表现为‘LY1306’>‘MSY106’>‘YY021’,上部烟叶变褐速率表现为‘LY1306’>‘YY021’>‘MSY106’。‘YY021’及其父母本变黄指数和变褐指数均随着叶片部位升高而减小。中部烟叶失水均衡性表现为‘LY1306’显著高于‘MSY106’,‘YY021’介于父母本中间,有中亲优势。‘YY021’中部烟叶绿素降解速率与父母本差异不显著,无杂种优势。中部烟PPO活性均值表现为‘MSY106’>‘YY021’>‘LY1306’,品种间差异显著,‘YY021’有中亲优势。综合上述各指标并参考生产实际表现‘,YY021’中部烟叶易烤性和耐烤性中等,有中亲优势,无超亲优势。

关键词： ‘YY021’ 烤烟烘烤特性易烤性耐烤性杂种优势

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