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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 storage.However,the shuttle issue and sluggish conversion kinetics of polysulfides remain unsolved.Confining metal nanoclusters with strong polarity in conductive porous carbon is an effective strategy for tackling such knotty issues.Herein,we design and synthesize hollow cubic carbon embedded with highly dispersed cobalt nanoclusters as an effective sulfur reservoir for lithium sulfur batteries.The 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 capability.Further 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

Bi-functional selection markers assist segregation of transgene-free,genome-edited mutants

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Science China(Life Sciences) 2021年第9期64卷 1567-1570页

作者： Zhen Liang Yuqing Wu Yingjie Guo Yanxiu Liu Lingling Ma Yincen Wu School of Life Science Shanxi UniversityTaiyuan 030006China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610000China

Dear Editor,In recent years,CRISPR/Cas9-mediated genome editing has been successfully applied in various plants for functional analysis or crop improvement(Chen et al.,2019).We previously reported DNA-free genome-edit... 详细信息

关键词： CRISPR/Cas9 genome functional

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 irradiation.The results showed that heterojunction composites of g-C_(3)N_(4) and ZrO_(2) could be successfully prepared by coupling agent grafting.The 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

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 voltage.However,the huge volume change and the intrinsic poor conductivity of SiOx still hinder the practical applications.How to address the issues is the focus of current research.In 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 agent.In this design,aniline was served as carbon sources,and Si6H6could be transformed to SiOx by AgN03 in mild solution condition.The 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

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：高铁酸钾酸催化剂脱硫模型氧化剂含硫化合物磷酸脱硫过程吸附剂

Response Surface Optimized Extraction of Flavonoids from Cacumen platycladi and Antioxidant Activities In vitro

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Medicinal Plant 2018年第5期9卷 5-9,12页

作者： Hongxia DU Xiang WANG Yanxiu Liu Xuan YU School of Chemical Engineering and Materials Science Nanjing Polytechnic Institute

[Objectives]To explore the optimal extraction process and the antioxidant activity of flavonoidsof Cacumen platycladi. [Methods]FCPwas obtained from C. platycladi by a new set extraction process of microwave-assisted extraction,freeze thawing,superfine crushingand freeze drying technology and purification. On the basis of single-factor tests,the quadratic regression parasitism model was established by the extraction amount of total flavonoids with microwave power,alcohol concentration,and liquid-to-solid ratio through the response surface methodology. [Results] The optimal extraction conditions were microwave power of 757 W,alcohol concentration of 69%,liquid-to-solid ratio of21∶ 1,with the optimal extraction yield of 15. 302 9 mg/g. Under the real conditions( microwave power of 800 W,alcohol concentration of69%,liquid-to-solid ratio of 21∶ 1) in our laboratory,the maximum yield of total flavonoids was 15. 9 mg/g,the results fitwell with the prediction of quadratic regression parasitism model. The good antioxidant activity has been determined byscavenging effect of FCP on 1,1-diphenyl-2-picrylhydrazyl( DPPH) radical and superoxide anion free radical with the scavenging yield of 70. 2% and 68. 8% respectively. [Conclusions]All results established a good foundation for furtherdevelopment of C. platycladi products.

关键词： Flavonoids of Cacumen platycladi Response surface methodology Extraction Optimization Antioxidant activity

Novel BiVO4@C3N4@GO Composites with Higher Photocatalytic Performance

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China Petroleum Processing & Petrochemical Technology 2019年第2期21卷 50-57页

作者： liu yanxiu Guo Zhi Wang Lijuan Lyu Wenxue Song Hua Wang Xueqin Provincial Key Laboratory of Oil & Gas Chemical Technology College of Chemistry & Chemical Engineering Northeast Petroleum University Daqing 163318 Shuntian Chemical Group Linyi 2076001 Postdoctoral Center of Northeast Petroleum Univerxity Daqing 163318 Daqing Chemical Research Center of Petrochemical Research Institute Daqing 163714 Daqing Petroleum Chemical Engineering Company Daqing 163714

BiVO4, BiVO4@C3N4 and BiVO4@C3N4@GO composite photo-catalysts were synthesized, and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), transmission electron microscopy (TEM), ultraviolet-visible diffuse reflectance spectroscopy (UV-vis DRS), Fourier transform infrared spectroscopy (FT-IR), and Brunauer-Emmett-Teller (BET) surface area techniques. The photocatalytic activity was evaluated on the degradation of methylene blue (MB) under visible light irradiation, which denoted that the BiVO4@C3N4@GO ternary composite outperformed the binary composite BiVO4@C3N4 and BiVO4. Then the effects of catalyst dosage, initial pH value, and initial methylene blue concentration on the degradation process were investigated systematically. The improvement of visible-light photocatalytic degradation performance was attributed to the enhanced visible light absorption, larger surface area, higher adsorption ability, and prolonged lifetime of photo-generated electron-hole pairs. The recycle experiments results showed that the BiVO4@C3N4@GO composite had excellent photo-stability for MB photocatalytic degradation.

关键词： BiVO4 C3N4 graphene oxide visible light photocatalyst

危险作业罪“现实危险”的司法证明:误区检视与规则建构

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中国刑警学院学报 2023年第5期 41-50页

作者：刘彦修浙江省人民检察院第二检察部浙江杭州310012

当前司法实践中认定危险作业罪“现实危险”存在证明误区,主要表现为忽视证明、替代证明、反向证明和混淆证明,这表明“现实危险”的刑法内涵和概念属性尚未得到充分认识。分析典型案例可以推导出“现实危险”应具备现实性、紧迫性和严... 详细信息

当前司法实践中认定危险作业罪“现实危险”存在证明误区,主要表现为忽视证明、替代证明、反向证明和混淆证明,这表明“现实危险”的刑法内涵和概念属性尚未得到充分认识。分析典型案例可以推导出“现实危险”应具备现实性、紧迫性和严重后果引发性。从证据法的视角看,“现实危险”是个案中存在的案件事实,需要在刑事诉讼中经历“证据材料—证据事实—要件事实”的证明过程。“现实危险”的司法证明应当以真实完备的证据材料为推理起点,遵循程序法和实体法的规则要求,借助客观准确的概括进行推论,在庭审中运用对话形式的论证方法呈现证据推理思路并展开控辩论证对话,达成控辩审三方的共同参与和认知交互。

关键词：现实危险事实认定证据推理可废止论证模式

Targeted combination therapy for glioblastoma by co-delivery of doxorubicin,YAP-siRNA and gold nanorods

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Journal of Materials Science & Technology 2021年第4期63卷 81-90页

作者： Lihuang Li Qiuyan Guo Yanxiu Liu Mindan Lu Jun Yang Yunlong Ge Qiang Zhang Benqiang Sun Xiumin Wang Li Liang-cheng Lei Ren Key Laboratory of Biomedical Engineering of Fujian Province University/Research Center of Biomedical Engineering of Xiamen Department of BiomaterialsCollege of MaterialsXiamen UniversityXiamen 361005China School of Pharmaceutical Sciences Fujian Provincial Key Laboratory of Innovative Drug Target ResearchXiamen UniversityXiamen 361102China Department of Neurosurgery Xiang’an Hospital of Xiamen UniversitySchool of MedicineXiamen UniversityXiamen 361102China Stomatological Hospital of Xiamen Medical College Xiamen 361105China State Key Lab of Physical Chemistry of Solid Surfaces Xiamen UniversityXiamen 361005China

The combination of brain targeting drug delivery systems and multi-modal intervention pose a promising therapeutic approach for glioblastoma therapy.In this study,we developed an angiopep-2 peptide modified cationic liposome loaded with doxorubicin,YAP-siRNA and gold nanorods(D/R@Ang2-Lip+Au)simultaneously,which has high encapsulating efficiency for doxorubicin(95.4%)and effective binding of siRNA at N/P ratio of 20:1.The fluorescence imaging and flow cytometry analysis revealed high cellular uptake of D/R@Ang2-Lip+Au.Real-time quantitative polymerase chain reaction and western blot analysis indicated that D/R@Ang2-Lip+Au could effectively inhibit the expression of YAP protein.In vitro and in vivo studies showed that D/R@Ang2-Lip+Au had the ability to target glioblastoma cells,and achieved better anti-proliferative effects compared with non-targeted D/R@Lip+Au.Moreover,in vivo experiment demonstrated that D/R@Ang2-Lip+Au was able to cross the blood-brain barrier,and combination therapy could significantly inhibit tumor growth.Therefore,the multifunctional D/R@Ang2-Lip+Au might provide a novel approach for effectively delivery of DOX,YAP-siRNA and AuNRs into the glioblastoma cells simultaneously and exerting synergistic therapeutic effects.

关键词： doxorubicin glioblastoma simultaneous