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Coupling Agent Grafting Assisted Synthesis of C3N4-ZrO_(2) Heterojunction Composites with Enhanced Photocatalytic Performance

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China Petroleum Processing & Petrochemical Technology 2023年第1期25卷 123-132页

作者： liu yanxiu Luo Jing Li Jinqi Wang Xueqin Song Hua Provincial Key Laboratory of Oil&Gas Chemical Technology College of Chemistry&Chemical EngineeringNortheast Petroleum UniversityDaqingHeilongjiang 163318China North China Branch of SINOPEC Sales Co. LtdTianjin 300450China

Heterojunction composites were prepared by silane coupling agent grafting from synthesized graphitic carbon nitride(g-C_(3)N_(4))and commercially available zirconia(ZrO_(2)).The samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),Fourier transform infrared(FT-IR)spectroscopy,UV-vis diffuse reflectance spectroscopy(DRS),photoluminescence(PL)spectroscopy,and electrochemical impedance spectroscopy(EIS).The photocatalytic activity of the composites was evaluated by the degradation of methylene blue(MB)under visible light *** results showed that heterojunction composites of g-C_(3)N_(4) and ZrO_(2) could be successfully prepared by coupling agent *** optimal mass ratio of g-C_(3)N_(4) and ZrO_(2) was 2:1,with an activity that was 3.8 times higher than g-C_(3)N_(4) and 15.3 times higher than ZrO_(2).This was ascribed to the stronger light absorption,faster interfacial charge transfer,and lower photogenerated carrier recombination of the heterojunction composites.

关键词： heterojunction graphitic carbon nitride zirconia coupling grafting

A review of existing and emerging binders for silicon anodic Li-ion batteries

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Nano Research 2023年第5期16卷 6736-6752页

作者： yanxiu liu Rong Shao Ruiyu Jiang Xinyu Song Zhong Jin Lin Sun Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province School of Chemistry and Chemical EngineeringYancheng Institute of TechnologyYancheng 224051China State Key Laboratory of Coordination Chemistry MOE Key Laboratory of Mesoscopic ChmistryMOE Key laboratory of High Performance Polymer Materials and TechnologyJiangsu Key laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

Silicon anodes have been extensively studied as a potential alternative to graphite ones for Li-ion ***,their commercial application is limited by the issues of the poor structural and interfacial *** this regard,one of the key strategies for fully exploiting the capacity potential of Si-based anodes is to design robust conductive binder *** the amount of binder in the electrode is small,it is,however,considered as a critical component of Si-based anodes for Li-ion *** this review,a brief summary is given from the structural and functional aspects of the existing binders for Si *** particular,three-dimensional and multifunctional polymeric binders with excellent electrical conductivity,flexibility,adhesion prepared by chemical bonding,electrostatic and coordination interactions have become the focus of research,are expected to accelerate the practical application of silicon ***,some suggestions for the future development of Si anodic binders are put forward.

关键词： lithium ion battery silicon anode binder design interface cycle stability

“联爱工程”项目缓解儿童白血病家庭因病致贫的效果评价

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中华肿瘤防治杂志 2024年第1期31卷 39-46页

作者：苏军邵頔王佳敏郝薇刘彦秀王龙孙晓杰山东大学齐鲁医学院公共卫生学院卫生管理与政策研究中心山东济南250012 国家卫生健康委员会卫生经济与政策研究重点实验室(山东大学) 山东济南250012

目的基于广东省河源市“联爱工程”慈善医疗救助项目,了解儿童白血病家庭因病致贫情况并分析其影响因素,评价慈善医疗救助对因病致贫的缓解效果。方法整群选取2017-08-15-2022-06-30参与项目救助、河源市户籍、年龄<18岁、处于维持期或... 详细信息

目的基于广东省河源市“联爱工程”慈善医疗救助项目,了解儿童白血病家庭因病致贫情况并分析其影响因素,评价慈善医疗救助对因病致贫的缓解效果。方法整群选取2017-08-15-2022-06-30参与项目救助、河源市户籍、年龄<18岁、处于维持期或停药期的85例白血病患儿及照顾者作为干预组,招募未参与项目、年龄<18岁、户籍为云浮市或汕尾市、基本医疗保险所在地与户籍所在地一致、治疗阶段是维持期或停药期的36例白血病患儿及照顾者为对照组。通过问卷调查和项目报销数据收集干预组和对照组患儿及家庭的相关信息,采用χ^(2)检验、单因素和多因素logistic回归分析2组家庭因病致贫情况及影响因素。结果医保报销后,干预组和对照组因病致贫发生率分别为31.76%和75.00%;因病致贫总缺口分别为12.27和21.37万元,平均缺口分别为0.14和0.59万元;医保报销前后,2组家庭因病致贫发生率干预组均低于对照组,差异具有统计学意义,P<0.001。干预组经项目补充报销后,因病致贫发生率降至21.18%,与医保报销后的对照组指标水平差异有统计学意义,P<0.001;因病致贫总缺口和平均缺口分别降至8.82和0.10万元。亚组分析显示,治疗阶段和确诊后是否为贫困户2个特征的差异对因病致贫发生率不会产生较大影响。是否移植、确诊至今的时间、去医院就诊的频率、是否接受项目救助是影响儿童白血病家庭发生因病致贫的影响因素。结论广东省河源市儿童白血病家庭因病致贫发生率较高,慈善医疗救助在医保报销的基础上发挥了积极的经济补偿作用。

关键词：慈善医疗救助儿童白血病因病致贫效果评价

SiOx/C-Ag nanosheets derived from Zintl phase CaSi_(2) via a facile redox reaction for high performance lithium storage

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Nano Research 2022年第1期15卷 395-400页

作者： Jie Xie Lin Sun yanxiu liu Xinguo Xi Ruoyu Chen Zhong Jin Jiangsu Province Cultivation Base for State Key Laboratory of Photovoltaic Science and Technology School of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China School of Chemistry and Chemical Engineering Yancheng Institute of TechnologyYancheng 224051China Key Laboratory of Mesoscopic Chmistry of Ministry of Education(MOE) School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

As one of the high-capacity anodes in lithium-ion batteries(LIBs),silicon oxide(SiOx)has attracted wide attention due to its high theoretical capacity,low cost,and proper working ***,the huge volume change and the intrinsic poor conductivity of SiOx still hinder the practical *** to address the issues is the focus of current *** this work,firstly,hydrogen passivated Si nanosheets(Si6H6)were prepared from Zintl phase CaSi2,then,two-dimensional Ag nanoparticle modified SiOVC nanocomposite was prepared via a facile complex redox reaction between SieH6 and AgN03-aniline complexing *** this design,aniline was served as carbon sources,and Si6H6could be transformed to SiOx by AgN03 in mild solution *** obtained Ag modified SiOVC(SiOx/C-Ag)electrode exhibited high specific capacity(550 mAh·g^(-1)at 0.6 A·g^(-1)),superior rate,and cycling performance when served as anode for LIBs.

关键词： SiOx anode LIBs redox reaction two-dimensional structure solution synthesis

Rapid construction of highly-dispersed cobalt nanoclusters embedded in hollow cubic carbon walls as an effective polysulfide promoter in high-energy lithium-sulfur batteries

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Nano Research 2022年第6期15卷 5105-5113页

作者： Lin Sun yanxiu liu Kaiqiang Zhang Feng Cheng Ruiyu Jiang Yangqing liu Jing Zhu Zhong Jin Huan Pang Key Laboratory for Advanced Technology in Environmental Protection of Jiangsu Province School of Chemistry and Chemical EngineeringYancheng Institute of TechnologyYancheng 224051China MOE Key Laboratory of Mesoscopic Chemistry MOE Key Laboratory of High Performance Polymer Materials and TechnologyJiangsu Key laboratory of Advanced Organic MaterialsSchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225009China

The ultrahigh specific energy density and low cost of lithium-sulfur batteries are suitable for the next generation of energy ***,the shuttle issue and sluggish conversion kinetics of polysulfides remain *** metal nanoclusters with strong polarity in conductive porous carbon is an effective strategy for tackling such knotty ***,we design and synthesize hollow cubic carbon embedded with highly dispersed cobalt nanoclusters as an effective sulfur reservoir for lithium sulfur *** large cavity structure and well-dispersed cobalt nanoclusters,with uniform sizes near 11 nm,enable the hosting structure to hold the high sulfur loading,70%capacity retention after 500 cycles at 2 C with a high sulfur loading of 6.5 mg·cm^(−2),effective stress release,accelerated polysulfide conversion,superior rate performance,strong physical confinement and chemical absorption *** density functional theoretical calculations demonstrate that the welldispersed cobalt nanoclusters in the hosting structure play a critical electrocatalytic role in boosting the capability of absorbing and converting polysulfides.

关键词： lithium-sulfur battery electrocatalysis Co nanocluster hollow carbon shuttle effect

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高速列车主动横向悬挂系统的临界时滞分析

机车电传动 2024年第4期 96-106页

作者：绳义千石怀龙陈龙飞刘志强刘沿修中铁第一勘察设计院集团公司环境与设备设计院陕西西安710043 西南交通大学轨道交通运载系统全国重点实验室四川成都610031

在高速列车主动悬挂系统动作的过程中,时滞现象在所难免,这在一定程度上制约了其性能的发挥。为了探究二系横向主动悬挂系统时滞现象对车辆动力学性能的影响,文章首先建立两自由度1/4车辆横向简化模型,推导出临界时滞理论计算公式;然后... 详细信息

在高速列车主动悬挂系统动作的过程中,时滞现象在所难免,这在一定程度上制约了其性能的发挥。为了探究二系横向主动悬挂系统时滞现象对车辆动力学性能的影响,文章首先建立两自由度1/4车辆横向简化模型,推导出临界时滞理论计算公式;然后,建立高速列车全自由度动力学模型,在Simulink中搭建控制模块进行联合仿真,采用一阶低通滤波器模拟实际控制力的幅值衰减和相位滞后特性,研究模态天棚与PID等控制策略的时滞影响规律。仿真结果表明,随着时滞的增加,模态天棚控制策略下的车体振动迅速恶化,横向平稳性指标迅速增加至2.0以上,而PID半主动控制几乎不增加横向平稳性指标;2种控制策略在50 ms内的时滞基本不会使构架振动剧烈恶化。若采用平稳性指标作为临界时滞的判据,则除PID控制策略外的大多数策略对应的临界时滞随着车速的提高而降低。文章系统性地研究了时滞问题,对高速列车主动悬挂系统的设计和优化具有一定的指导意义。

关键词：高速列车主动横向悬挂时滞平稳性联合仿真高速动车组

Rapid CO_(2) exfoliation of Zintl phase CaSi_(2)-derived ultrathin free-standing Si/SiO_(x)/C nanosheets for high-performance lithium storage

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Science China Materials 2022年第1期65卷 51-58页

作者： Lin Sun Jie Xie Songchao Huang yanxiu liu Lei Zhang Jun Wu Zhong Jin School of Chemistry and Chemical Engineering Yancheng Institute of TechnologyYancheng 224051China MOE Key Laboratory of Mesoscopic Chemistry MOE Key Laboratory of High Performance Polymer Materials and TechnologyJiangsu Key Laboratory of Advanced Organic MaterialsShenzhen Research Institute of Nanjing UniversitySchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

Semiconducting silicon(Si)nanomaterials have great potential for the applications in electronics,physics,and energy storage ***,to date,it is still a challenge to realize the batch production of Si nanomaterials via efficient and low-cost approaches,owing to some long-standing shortcomings,e.g.,complex procedures and time and/or energy ***,we report a green and inexpensive method to rapidly obtain two-dimensional(2D)free-standing Si/SiO_(x) nanosheets via the rapid thermal exfoliation of layered Zintl compound CaSi_(2).With the help of the rapid exfoliation reaction of CaSi_(2) in the atmosphere of greenhouse gas CO_(2),and the following mild sonication,2D free-standing Si/SiO_(x) nanosheets can be produced with very high *** applying the coating of a thin carbon outer layer,the electrodes of Si/SiO_(x)/C nanosheets serving as the anodes for lithium-ion batteries exhibit ultrahigh reversible capacity and outstanding electrochemical *** expect this study will provide new insights and inspirations for the convenient and batch production of nanostructural Si-based anode materials towards high-performance lithium-ion batteries.

关键词： lithium-ion battery two-dimensional silicon anode calcium silicide greenhouse gas

Oxidative Desulfurization of Model Sulfur Compound by Potassium Ferrate in the Presence of Phosphomolybdic Acid Catalyst

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China Petroleum Processing & Petrochemical Technology 2013年第1期15卷 61-65页

作者： liu yanxiu Song Hua Zhang Wenchao Provicial Key Laboratory of Oil and Gas Chemical Engineering College of Chemistry and Chemical EngineeringNortheastern Petroleum University Daqing Petrochemical Engineering Co. Ltd.

In this work, the removal of thiophene from simulated oil has been studied by using the adsorption, extraction and oxidation/adsorption methods, respectively. In the adsorptive desulfurization process, different commercial adsorbents were used to eliminate thiophene at ambient pressure and mild temperature, and the results showed that carbon powder had the best adsorption ability. In the extractive desulfurization process, the best desulfurization result was obtained when DMF is used. In the oxidative/adsorptive desulfurization procedure using synthesized potassium ferrate as the oxidant and phosphomolybdic acid solution as the catalyst, thiophene was oxidized and removed from hydrocarbons in combination with active carbon adsorption, and the residual sulfur content of simulated oil could be reduced to 15.3mg/L from the original level of 200mg/L, with the desulfurization rate reaching 92.3%.

关键词： oxidative desulfurization phosphomolybdic acid potassium ferrate

Estimate of NO_X production in the lightning channel based on three-dimensional lightning locating system

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Science China Earth Sciences 2014年第11期57卷 1613-1625页

作者： ZHANG Rong ZHANG GuangShu LI YaJun WANG YanHui WU Bin YU Hai liu yanxiu Key laboratory of Land Surface Process and Climate Change in Cold and Arid Regions Cold and Arid Regions Environmental and Engineering Research InstituteChinese Academy of Sciences College of Earth Science University of Chinese Academy of Sciences

Based on the VHF lightning locating system,a three-dimensional-space cell-gridded approach is used to extract the lighting channel and calculate the length of the *** clustering of the located radiation sources and then extracting the lightning channel,it can accurately obtain the length of the *** validate the feasibility of the approach,a simulation experiment is designed,and it shows the length error is no more than 10%.The relationship between the NO production of per unit arc length and atmospheric pressure obtained in laboratory is applied to the NOX production of per unit flash length at different altitudes in this *** channel length and the NOX production of 11 negative cloud-to-ground flashes and 59 intracloud flashes in an isolated thunderstorm in the northeastern Qinghai-Tibet Plateau are *** results show that the average channel lengths of per cloud-to-ground and intracloud flash are 28.9 and 22.3 km respectively;the average NOX productions of per cloud-to-ground and intracloud flash are 1.89×1025 and 0.42×1025 molecules,respectively.

关键词： lightning-produced nitrogen oxides lightning channel VHF radiation source location cell-gridded