The laminated transition metal disulfides(TMDs),which are well known as typical two-dimensional(2D)semiconductive materials,possess a unique layered structure,leading to their wide-spread applications in various field...The laminated transition metal disulfides(TMDs),which are well known as typical two-dimensional(2D)semiconductive materials,possess a unique layered structure,leading to their wide-spread applications in various fields,such as catalysis,energy storage,sensing,etc.In recent years,a lot of research work on TMDs based functional materials in the fields of electromagnetic wave absorption(EMA)has been carried out.Therefore,it is of great significance to elaborate the influence of TMDs on EMA in time to speed up the application.In this review,recent advances in the development of electromagnetic wave(EMW)absorbers based on TMDs,ranging from the VIB group to the VB group are summarized.Their compositions,microstructures,electronic properties,and synthesis methods are presented in detail.Particularly,the modulation of structure engineering from the aspects of heterostructures,defects,morphologies and phases are systematically summarized,focusing on optimizing impedance matching and increasing dielectric and magnetic losses in the EMA materials with tunable EMW absorption performance.Milestones as well as the challenges are also identified to guide the design of new TMDs based dielectric EMA materials with high performance.展开更多
Regulation the electronic density of solid-state electrolyte by donor–acceptor(D–A)system can achieve highly-selective Li^(+)transportation and conduction in solid-state Li metal batteries.This study reports a high-...Regulation the electronic density of solid-state electrolyte by donor–acceptor(D–A)system can achieve highly-selective Li^(+)transportation and conduction in solid-state Li metal batteries.This study reports a high-performance solid-state electrolyte thorough D–A-linked covalent organic frameworks(COFs)based on intramolecular charge transfer interactions.Unlike other reported COFbased solid-state electrolyte,the developed concept with D–A-linked COFs not only achieves electronic modulation to promote highly-selective Li^(+)migration and inhibit Li dendrite,but also offers a crucial opportunity to understand the role of electronic density in solid-state Li metal batteries.The introduced strong electronegativity F-based ligand in COF electrolyte results in highlyselective Li^(+)(transference number 0.83),high ionic conductivity(6.7×10^(-4)S cm^(−1)),excellent cyclic ability(1000 h)in Li metal symmetric cell and high-capacity retention in Li/LiFePO_(4)cell(90.8%for 300 cycles at 5C)than substituted C-and N-based ligands.This is ascribed to outstanding D–A interaction between donor porphyrin and acceptor F atoms,which effectively expedites electron transferring from porphyrin to F-based ligand and enhances Li^(+)kinetics.Consequently,we anticipate that this work creates insight into the strategy for accelerating Li^(+)conduction in high-performance solid-state Li metal batteries through D–A system.展开更多
Atomically precise copper-based nanoclusters stand out as one of the highly promising catalysts in the realm of electrochemical nitrate reduction reaction(NITRR)aimed at ammonia(NH_(3))synthesis.However,the controllab...Atomically precise copper-based nanoclusters stand out as one of the highly promising catalysts in the realm of electrochemical nitrate reduction reaction(NITRR)aimed at ammonia(NH_(3))synthesis.However,the controllable synthesis of stable Cu-based nanoclusters featuring fully inorganic anionic ligands for electrochemical NITRR remains a challenge.Herein,we present a simple and gentle chelated co-precipitation method for the uniform growth of ultrafine amorphous Cu(OH)Cl(a-Cu(OH)Cl)nanoclusters,featuring a diameter of approximately 9 nm,onto carbon nanotubes(a-Cu(OH)Cl/CNTs),aimed at enhancing electrocatalytic NITRR performance.Intriguingly,trisodium citrate dihydrate(TCD)could effectively change the crystalline form of Cu-based nanoclusters to obtain a-Cu(OH)Cl nanoclusters instead of high-crystallinity Cu_(2)(OH)_(3)Cl(c-Cu_(2)(OH)_(3)Cl)nanoclusters.In comparison to c-Cu_(2)(OH)_(3)Cl nanoclusters,a-Cu(OH)Cl nanoclusters,featuring a smaller particle size and containing more lowcoordination Cu atoms,provide more efficient catalytic sites,thereby enhancing the reaction rate and energy efficiency for NH_(3)production.The proposed chelated co-precipitation method provides a promising crystalline modulation engineering strategy to boost the electrocatalytic performances of metal nanoclusters.展开更多
The COVID-19 pandemic has caused higher educational institutions around the world to close campus-based activities and move to online delivery.The aim of this paper is to present the case of Global College of Engineer...The COVID-19 pandemic has caused higher educational institutions around the world to close campus-based activities and move to online delivery.The aim of this paper is to present the case of Global College of Engineering and Technology(GCET)and how its practices including teaching,students/staff support,assessments,and exam policies were affected.The paper investigates the mediating role of no detriment policy impact on students’result along with the challenges faced by the higher educational institution,recommendations and suggestions.The investigation concludes that the strategies adopted for online delivery,student support,assessments and exam policies have helped students to effectively cope with the teaching and learning challenges posed by the COVID-19 pandemic without affecting their academic results.The study shows that 99%of students were able to maintain the same or better level of performance during the 1st COVID-19 semester.One percent of students had shown a slight decrease in their performance(about 1%–2%)with respect to their overall marks pre-COVID-19.The no detriment policy has succoured those 1%of the students to maintain their overall performance to what it used to be pre-COVID-19 pandemic.Finally,the paper provides the list of challenges and suggestions for smooth conduction of online education.展开更多
Sodium-ion batteries(SIBs)have garnered significant attentions for grid-scale energy storage due to the low cost and abundant sodium resources.Among the various cathode materials,sodium layered transition metal oxides...Sodium-ion batteries(SIBs)have garnered significant attentions for grid-scale energy storage due to the low cost and abundant sodium resources.Among the various cathode materials,sodium layered transition metal oxides(Na_(x)TMO_(2))are considered highly promising for practical applications of SIBs relying on their high theoretical capacities and facile syntheses.However,the poor air stability,sluggish interfacial kinetics,and detrimental phase transitions of Na_(x)TMO_(2) commonly result in unsatisfactory cycling stability as well as inferior rate capability.In this review,recent achievements and progress in interfacial regulations aimed at improving the air stability and electrochemical performances of Na_(x)TMO_(2),such as organic/inorganic coating,interfacial-coating-doping,and heterogeneous phase designing are summarized.Such approaches can not only enable the in-situ conversion of residual alkali and/or enhance the interfacial stability,but also improve the electrochemical reaction kinetics and mitigate phase evolutions.The structural stability enhancement mechanisms of Na_(x)TMO_(2) layered oxides resulted from surface reconstructions are profoundly discussed and the influences on their electrochemical properties are concluded in this work.Finally,we outlook the novel interfacial modification strategies like of layered-tunnel heterostructure building and organicinorganic co-coating.The state-of-the-art characterization techniques and artificial intelligence are also elaborated to develop high-performance Na_(x)TMO_(2) cathodes in the future.We believe that the insights presented in this review can serve as meaningful guidance for the interfacial modulations of Na_(x)TMO_(2) cathodes.展开更多
基金This work was supported by the National Natural Science Foundation of China(52372289,52102368,52072192 and 51977009)Regional Joint Fund for Basic Research and Applied Basic Research of Guangdong Province(No.2020SA001515110905).
文摘The laminated transition metal disulfides(TMDs),which are well known as typical two-dimensional(2D)semiconductive materials,possess a unique layered structure,leading to their wide-spread applications in various fields,such as catalysis,energy storage,sensing,etc.In recent years,a lot of research work on TMDs based functional materials in the fields of electromagnetic wave absorption(EMA)has been carried out.Therefore,it is of great significance to elaborate the influence of TMDs on EMA in time to speed up the application.In this review,recent advances in the development of electromagnetic wave(EMW)absorbers based on TMDs,ranging from the VIB group to the VB group are summarized.Their compositions,microstructures,electronic properties,and synthesis methods are presented in detail.Particularly,the modulation of structure engineering from the aspects of heterostructures,defects,morphologies and phases are systematically summarized,focusing on optimizing impedance matching and increasing dielectric and magnetic losses in the EMA materials with tunable EMW absorption performance.Milestones as well as the challenges are also identified to guide the design of new TMDs based dielectric EMA materials with high performance.
基金financial support provided by National Natural Science Foundation of China(52303283,52372232,52064049)the Major Science and Technology Projects of Yunnan Province(202302AB080019-3)+2 种基金National Natural Science Foundation of Yunnan Province(202301AS070040,202401AU070201)the Analysis and Measurements Center of Yunnan University for the sample testing servicethe Electron Microscope Center of Yunnan University for the support of this work.
文摘Regulation the electronic density of solid-state electrolyte by donor–acceptor(D–A)system can achieve highly-selective Li^(+)transportation and conduction in solid-state Li metal batteries.This study reports a high-performance solid-state electrolyte thorough D–A-linked covalent organic frameworks(COFs)based on intramolecular charge transfer interactions.Unlike other reported COFbased solid-state electrolyte,the developed concept with D–A-linked COFs not only achieves electronic modulation to promote highly-selective Li^(+)migration and inhibit Li dendrite,but also offers a crucial opportunity to understand the role of electronic density in solid-state Li metal batteries.The introduced strong electronegativity F-based ligand in COF electrolyte results in highlyselective Li^(+)(transference number 0.83),high ionic conductivity(6.7×10^(-4)S cm^(−1)),excellent cyclic ability(1000 h)in Li metal symmetric cell and high-capacity retention in Li/LiFePO_(4)cell(90.8%for 300 cycles at 5C)than substituted C-and N-based ligands.This is ascribed to outstanding D–A interaction between donor porphyrin and acceptor F atoms,which effectively expedites electron transferring from porphyrin to F-based ligand and enhances Li^(+)kinetics.Consequently,we anticipate that this work creates insight into the strategy for accelerating Li^(+)conduction in high-performance solid-state Li metal batteries through D–A system.
基金the financial support from the National Natural Science Foundation of China(22479074 and 22475096)the Natural Science Foundation of Sichuan Province(2023NSFSC1074 and 2025NSFTD0005)+9 种基金the Talent Introduction Plan of Xihua University(Z222051)the Equipment Pre-Research and MOE Joint Fund General Project(8091B02052407)the National Science Foundation of Jiangsu Province(BK20240400 and BK20241236)the Jiangsu Province Science and Technology Major Project(BG2024013)the Jiangsu Province Scientiflc and Technological Achievenments Transformation Special Fund(BA2023037)the Jiangsu Province Academic Degree and Postgraduate Education Reform Project(JGKT24_C001)the Suzhou City Key Core Technology Open Competition Project(SYG2024122)the Open Research Fund of Suzhou Laboratory(SZLAB-1308-2024TS005)the Suzhou City Gusu Leading Talent Program of Scientific and Technological Innovation and Entrepreneurship(ZXL2021273)the Chenzhou National Sustainable Development Agenda Innovation Demonstration Zone Provincial Special Project(2023sfq11)。
文摘Atomically precise copper-based nanoclusters stand out as one of the highly promising catalysts in the realm of electrochemical nitrate reduction reaction(NITRR)aimed at ammonia(NH_(3))synthesis.However,the controllable synthesis of stable Cu-based nanoclusters featuring fully inorganic anionic ligands for electrochemical NITRR remains a challenge.Herein,we present a simple and gentle chelated co-precipitation method for the uniform growth of ultrafine amorphous Cu(OH)Cl(a-Cu(OH)Cl)nanoclusters,featuring a diameter of approximately 9 nm,onto carbon nanotubes(a-Cu(OH)Cl/CNTs),aimed at enhancing electrocatalytic NITRR performance.Intriguingly,trisodium citrate dihydrate(TCD)could effectively change the crystalline form of Cu-based nanoclusters to obtain a-Cu(OH)Cl nanoclusters instead of high-crystallinity Cu_(2)(OH)_(3)Cl(c-Cu_(2)(OH)_(3)Cl)nanoclusters.In comparison to c-Cu_(2)(OH)_(3)Cl nanoclusters,a-Cu(OH)Cl nanoclusters,featuring a smaller particle size and containing more lowcoordination Cu atoms,provide more efficient catalytic sites,thereby enhancing the reaction rate and energy efficiency for NH_(3)production.The proposed chelated co-precipitation method provides a promising crystalline modulation engineering strategy to boost the electrocatalytic performances of metal nanoclusters.
基金supported by Global College of Engineering and Technology(GCET).
文摘The COVID-19 pandemic has caused higher educational institutions around the world to close campus-based activities and move to online delivery.The aim of this paper is to present the case of Global College of Engineering and Technology(GCET)and how its practices including teaching,students/staff support,assessments,and exam policies were affected.The paper investigates the mediating role of no detriment policy impact on students’result along with the challenges faced by the higher educational institution,recommendations and suggestions.The investigation concludes that the strategies adopted for online delivery,student support,assessments and exam policies have helped students to effectively cope with the teaching and learning challenges posed by the COVID-19 pandemic without affecting their academic results.The study shows that 99%of students were able to maintain the same or better level of performance during the 1st COVID-19 semester.One percent of students had shown a slight decrease in their performance(about 1%–2%)with respect to their overall marks pre-COVID-19.The no detriment policy has succoured those 1%of the students to maintain their overall performance to what it used to be pre-COVID-19 pandemic.Finally,the paper provides the list of challenges and suggestions for smooth conduction of online education.
基金supported by the National Natural Science Foundation of China(52402301,52472240,52202284)the Natural Science Foundation of Zhejiang Province(LQ23E020002)the Wenzhou Key Scientific and Technological Innovation Research Project(ZG2023053)。
文摘Sodium-ion batteries(SIBs)have garnered significant attentions for grid-scale energy storage due to the low cost and abundant sodium resources.Among the various cathode materials,sodium layered transition metal oxides(Na_(x)TMO_(2))are considered highly promising for practical applications of SIBs relying on their high theoretical capacities and facile syntheses.However,the poor air stability,sluggish interfacial kinetics,and detrimental phase transitions of Na_(x)TMO_(2) commonly result in unsatisfactory cycling stability as well as inferior rate capability.In this review,recent achievements and progress in interfacial regulations aimed at improving the air stability and electrochemical performances of Na_(x)TMO_(2),such as organic/inorganic coating,interfacial-coating-doping,and heterogeneous phase designing are summarized.Such approaches can not only enable the in-situ conversion of residual alkali and/or enhance the interfacial stability,but also improve the electrochemical reaction kinetics and mitigate phase evolutions.The structural stability enhancement mechanisms of Na_(x)TMO_(2) layered oxides resulted from surface reconstructions are profoundly discussed and the influences on their electrochemical properties are concluded in this work.Finally,we outlook the novel interfacial modification strategies like of layered-tunnel heterostructure building and organicinorganic co-coating.The state-of-the-art characterization techniques and artificial intelligence are also elaborated to develop high-performance Na_(x)TMO_(2) cathodes in the future.We believe that the insights presented in this review can serve as meaningful guidance for the interfacial modulations of Na_(x)TMO_(2) cathodes.
