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Sodium vanadium oxides:From nanostructured design to high-performance energy storage materials

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Journal of Materials Science & Technology 2022年第26期121卷 80-92页

作者： yifan dong Shuolei Deng Ziting Ma Ge Yin Changgang Li Xunlong Yuan Huiyun Tan Jing Pan Liqiang Mai Fan Xia Engineering Research Center of Nano-Geomaterials of Ministry of Education Faculty of Material Science and ChemistryChina University of GeosciencesWuhan 430074China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China

Developing high-capacity and low-cost cathode materials for metal-ion rechargeable batteries is the mainstream trend and is also the key to providing breakthroughs in making high-energy rechargeable batteries.Vanadium has a variety of valence states and can form a variety of vanadate structures.As a typical positive electrode material,vanadate has abundant ion adsorption sites,a unique“pillar”framework,and a typical layered structure.Therefore,it has the advantages of high specific capacity and excellent rate performance,possessing the prospect of being a large-capacity energy storage material.In this review,we focus on applications of sodium vanadium oxides(NVO)in electrical energy storage(EES)devices and summarize sodium vanadate materials from three aspects,including crystal structure,electrochemical performance,and energy storage mechanism.The recent progress of NVO-based highperformance energy storage materials along with nanostructured design strategies was provided and discussed as well.This review is intended to serve as general guidance for researchers to develop desirable sodium vanadate materials.

关键词： Sodium vanadate Nanostructured materials Rechargeable metal-ion batteries Energy storage mechanism

Reactions of Rare-Earth Metal Based Lewis Pairs with Azides

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Chinese Journal of Chemistry 2020年第6期38卷 559-564页

作者： yifan dong Kejian Chang Xin Xu Key Laboratory of Organic Synthesis of Jiangsu Province College of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhouJiangsu 215123China

The reactivity of homoleptic rare-earth metal aryloxide based Lewis pairs toward organic azide substrates has been investigated herein.Treatment of RE(OAr)3(RE=La,Sm,X and Sc,Ar=2,6-'Bu2-C6H3),PEt3 and Me3SiN3 in 2:1:1 molar ratio resulted in formation of separated ion pair complexes[Me3Si-PEt3]^+[(ArO)3RE-N=N=N-RE(OAr)3]^-under mild conditions.Replacement of phosphine with the nitrogen-containing Lewis base l,4-diazabicyclo[2.2.2]octane(DABCO)produced analogous rare-earth azide complexes with[Me3Si-DABCO]+counterions.In contrast,reaction of the La(OAr)3/PEt3 Lewis pair with 1-adamantyl azide(AdN3)afforded the typical frustrated Lewis pair-type 1,1-addition product.A tetrahydrofuran ring-opening reaction was also observed for the resulting rare-earth azide complex with the[Me3Si-PEt3]+cation,with cleavage of the C—0 bond by Si/P cooperation.

关键词： azide rare complexes

The Promotion Effect of Low-Molecular Hydroxyl Compounds on the Nano-Photoelectrocatalytic Degradation of Fulvic Acid and Mechanism

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Nano-Micro Letters 2016年第4期8卷 320-327页

作者： yifan dong Jinhua Li Xuejin Li Baoxue Zhou School of Environmental Science and Engineering Shanghai Jiao Tong University Key Laboratory for Thin Film and Microfabrication of the Ministry of Education Shanghai Jiao Tong University

A significant promotion effect of low-molecular hydroxyl compounds(LMHCs) was found in the nano-photoelectrocatalytic(NPEC) degradation of fulvic acid(FA),which is a typical kind of humic acid existing widely in natural water bodies,and its influence mechanism was proposed.A TiO_2 nanotube arrays(TNAs) material is served as the photoanode.Methanol,ethanediol,and glycerol were chosen as the representative of LMHCs in this study.The adsorption performance of organics on the surface of TNAs was investigated by using the instantaneous photocurrent value.The adsorption constants of FA,methanol,ethanediol,and glycerol were 43.44,19.32,7.00,and 1.30,respectively,which indicates that FA has the strongest adsorption property.The degradation performance of these organics and their mixture were observed in a thin-layer reactor.It shows that FA could hardly achieve exhausted mineralization alone,while LMHCs could be easily oxidized completely in the same condition.The degradation degree of FA,which is added LMHCs,improves significantly and the best promotion effect is achieved by glycerol.The promotion effect of LMHCs in the degradation of FA could be contributed to the formation of a tremendous amount of hydroxyl radicals in the NPEC process.The hydroxyl radicals could facilitate the complete degradation of both FA and its intermediate products.Among the chosen LMHCs,glycerol molecule which has three hydroxyls could generate the most hydroxyl radicals and contribute the best effective promotion.This work provides a new way to promote the NPEC degradation of FA and a direction to remove humus from polluted water.

关键词： Fulvic acid Nano-photoelectrocatalytic degradation Promotion effect Low-molecular hydroxyl compounds

The Inhibition Effect of Tert-Butyl Alcohol on the TiO_2 Nano Assays Photoelectrocatalytic Degradation of Different Organics and Its Mechanism

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Nano-Micro Letters 2016年第3期8卷 221-231页

作者： Xuejin Li Jinhua Li Jing Bai yifan dong Linsen Li Baoxue Zhou School of Environmental Science and Engineering Shanghai Jiao Tong University Key Laboratory for Thin Film and Microfabrication of the Ministry of Education

The inhibition effect of tert-butyl alcohol(TBA), identified as the·OH radical inhibitor, on the TiO_2 nano assays(TNA) photoelectrocatalytic oxidation of different organics such as glucose and phthalate was reported. The adsorption performance of these organics on the TNA photoelectrode was investigated by using the instantaneous photocurrent value, and the degradation property was examined by using the exhausted reaction. The results showed that glucose exhibited the poor adsorption and easy degradation performance, phthalate showed the strong adsorption and harddegradation, but TBA showed the weak adsorption and was the most difficult to be degraded. The degradation of both glucose and phthalate could be inhibited evidently by TBA. But the effect on glucose was more obvious. The different inhibition effects of TBA on different organics could be attributed to the differences in the adsorption and the degradation property. For instance, phthalate of the strong adsorption property could avoid from the capture of·OH radicals by TBA in TNA photoelectrocatalytic process.

关键词： Tert-butyl alcohol Photoelectrocatalysis TiO2 nano assays Hydroxyl radical inhibitor Inhibition effect

Three-dimensional printing of β-tricalcium phosphate/calcium silicate composite scaffolds for bone tissue engineering

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Bio-Design and Manufacturing 2018年第2期1卷 146-156页

作者： yifan dong Haibo Duan Naru Zhao Xiao Liu Yijuan Ma Xuetao Shi School of Materials Science and Engineering South China University of Technology Guangzhou 510641 China National Engineering Research Centre for Tissue Restoration and Reconstruction Guangzhou 510006 China Guangdong Province Key Laboratory of Biomedical Engineering South China University of Technology Guangzhou 510006 China South China Institute of Collaborative Innovation Dongguan China

Bioactive scaffolds with interconnected porous structures are essential for guiding cell growth and new bone formation. In this work, we successfully fabricated three-dimensional (3D) porous $$\upbeta $$ -tricalcium phosphate ( $$\upbeta $$ -TCP)/calcium silicate (CS) composite scaffolds with different ratios by 3D printing technique and further investigated the physiochemical properties, in vitro apatite mineralization properties and degradability of porous $$\upbeta $$ -TCP/CS scaffolds. Moreover, a series of in vitro cell experiments including the attachment, proliferation and osteogenic differentiation of mouse bone marrow stromal cells were conducted to testify their biological performances. The results showed that 3D printed $$\upbeta $$ -TCP/CS scaffolds possessed of controllable internal porous structures and external shape. Furthermore, the introduction of CS decreased the shrinkage of scaffolds and improved the in vitro apatite formation activity and degradation rate. Meanwhile, compared with pure $$\upbeta $$ -TCP scaffold, the $$\upbeta $$ -TCP/CS composite scaffolds were more conducive to promote cell adhesion, spread and osteogenesis differentiation. However, when the content of CS was increased to 45%, the ions dissolution rate of the composite scaffolds was so high that leaded to the increase in pH value, which inhibited the proliferation of cells. Our results suggested that the introduction of appropriate CS into $$\upbeta $$ -TCP bioceramic is an effective strategy to prepare bioactive 3D printed bioceramic scaffolds for hard tissue regeneration.

关键词：生物活性支架细胞生长生物材料生物技术

Probing non-polarizable liquid/liquid interfaces using scanning ion conductance microscopy

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Science China Chemistry 2020年第3期63卷 411-418页

作者： Yaxiong Gu Ye Chen yifan dong Junjie Liu Xianhao Zhang Mingzhi Li Yuanhua Shao Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular EngineeringPeking UniversityBeijing 100871China

The study of microscopic structure of a liquid/liquid interface is of fundamental importance due to its close relation to the thermodynamics and kinetics of interfacial charge transfer reactions.In this article,the microscopic structure of a non-polarizable water/nitrobenzene(W/NB)interface was evaluated by scanning ion conductance microscope(SICM).Using SICM with a nanometer-sized quartz pipette filled with an electrolyte solution as the probe,the thickness of this type of W/NB interface could be measured at sub-nanometer scale,based on the continuous change of ionic current from one phase to another one.The effects for thicknesses of the non-polarizable W/NB interfaces with different electrolyte concentrations,the Galvani potentials at the interface and the applied potentials on the probe were measured and systematically analyzed.Both experimental setups,that is an organic phase up and an aqueous down,and a reverse version,were employed to acquire the approach curves.These data were compared with those of an ideal polarizable interface under the similar experimental conditions,and several characteristics of non-polarizable interfaces were found.The thickness of a non-polarizable interface increases with the decrease of electrolyte concentration and the increase of applied potential,which is similar to the situation of a polarizable liquid/liquid interface.We also find that the Galvani potential across a non-polarizable interface can also influence the interfacial thickness,this phenomenon is difficult to observe when using polarizable interface.Most importantly,by the comparison of two kinds of liquid/liquid interfaces,we experimentally proved that much more excess ions are gathered in the space charge layer of non-polarizable interfaces than in that of polarizable interfaces.These results are consistent with the predictions of molecular dynamic simulations and X-ray reflectivity measurements.

关键词： micro/nano pipettes scanning ion conductance microscopy microstructure of a non-polarizable liquid/liquid interface

Spatial distribution of water and wind erosion and their influence on the soil quality at the agropastoral ecotone of North China

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International Soil and Water Conservation Research 2020年第3期8卷 253-265页

作者： Yanzai Wang yifan dong Zhengan Su Simon M.Mudd Qiuhong Zheng Gang Hu dong Yan Institute of International Rivers and Eco-Security Yunnan UniversityKunming650091PR China Key Laboratory of Mountain Hazards&Surface Process Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu610041PR China College of Geography and Tourism Chongqing Normal UniversityChongqing401331PR China School of GeoSciences University of EdinburghEdinburghEH89XPUK China Meteorological Administration Training Center CMABeijing100081PR China School of Tourism and Geography Sciences Qingdao266071ShandongPR China National Institute for Radiological Protection Chinese Center for Disease Control and PreventionBeijing100088PR China

In semiarid regions,wind and water erosion are serious environmental and ecological problems around world.They have different impacts on soil quality over a range of spatial scales.Analyzing the spatial distribution of soil erosion and understanding the impacts of wind and water erosion on soil quality at the regional scale is vital for mitigating soil erosion risk.In this study we explore the spatial distributions of water and wind erosion around Zhangjiakou city which suffers both water and wind erosion contemporaneously,and detect the influence of soil erosion on soil quality.We find that annual wind erosion intensities range 4.99-10.05 t ha-1 yr-1,and annual water erosion intensities range 2.92-4.14 t ha-1 yr-1.Areas with higher potential wind and total erosion risk occur mainly in northwest and southeast Zhangjiakou city,whereas potential water erosion risk is highest in the southwest and central regions.The highest erosion rates are concentrated in gentle parts of the landscape,where agriculture has led to low vegetation cover.Steeper portions of the landscape,which remain forested,have lower erosion rates.These spatial patterns are dominated by higher wind erosion,which correlates with sur-face soil coarsening and higher water infiltration,whereas the soil water holding capacity decreases with increasing wind erosion rates.In regions with high water infiltration rates,we find the intensity of water erosion weakened.To mitigate risks of soil degradation,suitable erosion measures should be imple-mented according to the dominant erosion type,which varies in space.

关键词： Soil erosion Soil quality Spatial distribution Agropastoral ecotone

C-dots assisted synthesis of gold nanoparticles as labels to catalyze copper deposition for ultrasensitive electrochemical sensing of proteins

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Science China Chemistry 2018年第4期61卷 476-482页

作者： Xiaoli Qin yifan dong Minghan Wang Zhiwei Zhu Meixian Li Xiangjian Chen Di Yang Yuanhua Shao Beijing National Laboratory for Molecular Sciences College of Chemistry and Molecular EngineeringPeking University Institute of Cardiovascular Disease First Affiliated Hospital of Nanjing Medical University

We report an ultrasensitive protocol for electrochemical sensing using the hydroxyl-rich C-dots assisted synthesis of gold nanoparticles(C-dots@AuNP) as labels with copper depositon reaction. The C-dots catalyzing copper deposition reaction was implemented for the first time. We constructed a sandwich-type immunosensor on the chitosan modified glassy carbon electrode(GCE) by glutaraldehyde(GA) crosslinking, with C-dots@AuNP as biolabels. Copper was deposited on the catalytic surfaces of second antibody-conjugated C-dots@AuNP nanoparticles through CuSO_4-ascorbic acid reduction, because both C-dots and AuNPs could strongly catalyze the CuSO_4 and ascorbic acid to form Cu particles, which amplified the detection signal. Then the corresponding antigen was quantified based on simultaneous chemical-dissolution/cathodic-preconcentration of copper for insitu analysis using anodic stripping square wave voltammetry(ASSWV) directly on the modified electrode. Under optimized conditions, these electrodes were employed for sandwich-type immunoanaly sis, pushing the lower limits of detection(LODs)down to the fg mL^(-1) level for human immunoglobulin G(IgG) and cardiac troponin I(cTnI), a cardiac biomarker. These novel sensors have good stability and acceptable accuracy and reproducibility, suggesting potential applications in clinical diagnostics.

关键词：电气化学催化标签合成蛋白质铜金免疫球蛋白

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欧洲战略转型左右为难

Contemporary International Relations 2024年第1期34卷 41-47页

作者： CICIR Task Force Chen Yang Li Chao Huang Jing dong yifan Lyu Yunmou 不详 the Institute of European Studies at the China Institutes of Contemporary International Relations

In 2023, to cope with the turn of events triggered by the Ukraine crisis and adapt to the fierce competition among major powers, Europe's strategic center of gravity has tilted toward security, emphasizing risk preven... 详细信息

关键词：战略转型 transformation. prevention