检索结果-南通市图书馆

The activity of Zn precursors determines the cation exchange reaction kinetics with Ag_(2)S:Zn-doped Ag_(2)S or Ag_(2)S@ZnS QDs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2023年第10期16卷 12315-12322页

作者： Zhiyong Tang Hongchao Yang Ziqiang Sun Yejun Zhang Guangcun Chen Qiangbin Wang CAS Key Laboratory of Nano-Bio Interface Division of Nanobiomedicine and i-LabSuzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Nano Science and Technology Institute University of Science and Technology of ChinaHefei 230026China

Cation exchange(CE)has been emerged as a promising post-synthesis strategy of colloidal nanocrystals.However,it is unclear how the cation precursor affects the CE process and the final colloidal nanocrystals.Herein,we utilized two Zn-B Lewis acidbase adduct complexes(B=oleylamine(OAM)and methanol(MeOH))as Zn precursors for CE with Ag_(2)S quantum dots(QDs).Our study revealed that the steric hindrance and complexing capabilities of Zn precursor significantly affect the CE kinetics.As a result,the Zn-doped Ag_(2)S(Zn:Ag_(2)S)and Ag_(2)S@ZnS core–shell QDs were successfully obtained with enormous enhancement of their photoluminescence(PL)intensities.Theoretical simulation showed that the Zn-OAM with higher desolvation energy and spatial hindrance tended to form doped Zn:Ag_(2)S QDs due to the inefficient cation exchange.Whereas the Zn-MeOH with lower exchange barrier promoted the conversion of Ag-S to Zn-S,thus forming Ag_(2)S@ZnS core–shell QDs.We anticipate that this finding will enrich the regulatory approaches of post-synthesis of colloidal nanocrystals with desirable properties.

关键词： cation exchange Ag_(2)S quantum dots phase structure desolvation coordination

A Review of Solid Electrolyte Interphase(SEI)and Dendrite Formation in Lithium Batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Electrochemical Energy Reviews 2023年第1期6卷 680-725页

作者： Borong Li Yu Chao Mengchao Li Yuanbin Xiao Rui Li Kang Yang Xiancai Cui Gui Xu Lingyun Li Chengkai Yang Yan Yu David P.Wilkinson Jiujun Zhang College of Materials Science and Engineering Fuzhou UniversityFuzhou 350108FujianChina Key Laboratory of Eco-Materials Advanced Technology(Fuzhou University) Fuzhou UniversityFuzhou 350108FujianChina Department of Chemical and Biochemical Engineering University of British ColumbiaVancouverBC V6T1W5Canada Institute for Sustainable Energy/College of Sciences Shanghai UniversityShanghai 200444China

Lithium-metal batteries with high energy/power densities have significant applications in electronics,electric vehicles,and stationary power plants.However,the unstable lithium-metal-anode/electrolyte interface has induced insufficient cycle life and safety issues.To improve the cycle life and safety,understanding the formation of the solid electrolyte interphase(SEI)and growth of lithium dendrites near the anode/electrolyte interface,regulating the electrodeposition/electrostripping processes of Li^(+),and developing multiple approaches for protecting the lithium-metal surface and SEI layer are crucial and necessary.This paper comprehensively reviews the research progress in SEI and lithium dendrite growth in terms of their classical electrochemical lithium plating/stripping processes,interface interaction/nucleation processes,anode geometric evolution,fundamental electrolyte reduction mechanisms,and effects on battery performance.Some important aspects,such as charge transfer,the local current distribution,solvation,desolvation,ion diffusion through the interface,inhibition of dendrites by the SEI,additives,models for dendrite formation,heterogeneous nucleation,asymmetric processes during stripping/plating,the host matrix,and in situ nucleation characterization,are also analyzed based on experimental observations and theoretical calculations.Several technical challenges in improving SEI properties and reducing lithium dendrite growth are analyzed.Furthermore,possible future research directions for overcoming the challenges are also proposed to facilitate further research and development toward practical applications.

关键词： Lithium-metal anode Solid electrolyte interphase(SEI) Dendrite formation Lithium batteries Classical electrochemical processes Additives Heterogeneous nucleation Asymmetric processes Solvation structure desolvation In situ characterization of nucleation

膜去溶进样ICP-MS法测定电子级高纯盐酸中痕量金属杂质

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

质谱学报 2005年第Z1期26卷 5-6,40页

作者：孟蓉李红华黄志齐北京化学试剂研究所北京100022 北京化学试剂研究所北京100022 北京化学试剂研究所北京100022

Determination of thirty four trace metal elements in electronic high purity hydrochloric acid by ICP-MS (Standard Condition, Plasma Screen Condition) with membrane desolvation was described. Matrix effects were compensated by adding rhodium as the internal standard. Detection limits is 0.1 to 100 ng/L; the recovery of the method is 90%-110%. Long term RSD was less than 5%. The results from ICP and ICP-MS are correspondent. ICP-MS improves the accuracy and efficiency of analyses.

关键词： ICP-MS electronic high purity hydrochloric acid, trace metal elements membrane desolvation

Slow Magnetic Relaxation Behaviors within two Dy2Single Molecule Magnets with Single-crystal to Single-crystal Transformation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Slow Magnetic Relaxation Behaviors within two Dy2Single Mole...