The“dual-carbon”strategy promotes the development of the wastewater treatment sector and is an important tool for leading science and technology innovations.Based on the global climate change and the new policies in...The“dual-carbon”strategy promotes the development of the wastewater treatment sector and is an important tool for leading science and technology innovations.Based on the global climate change and the new policies introduced by China,this paper described the new needs for the development of wastewater treatment science and technology.It offered a retrospective analysis of the historical trajectory of scientific and technological advancements in this field.Utilizing bibliometrics,it delineated the research hotspots within wastewater treatment,notably highlighting materials genomics,artificial intelligence,and synthetic biology.Furthermore,it posited that,in the future,the field of wastewater treatment should follow the paths of technological innovations with multi-dimensional needs,such as carbon reduction,pollution reduction,health,standardisation,and intellectualisation.The purpose of this paper was to provide references and suggestions for scientific and technological innovations in the field of wastewater treatment,and to contribute to the common endeavor of moving toward a Pollution-Free Planet.展开更多
Potassium ion hybrid capacitors(PIHC)have promising applications in medium and large-scale energy storage systems due to their high energy/power density,abundant potassium resource and low cost.However,the slow kineti...Potassium ion hybrid capacitors(PIHC)have promising applications in medium and large-scale energy storage systems due to their high energy/power density,abundant potassium resource and low cost.However,the slow kinetics of battery-type anodes originating from the large-size K+results in a mismatch between the two electrodes,rendering the modest energy density of PIHC.Herein,we first develop an electrospinning strategy to successfully synthesize fibrous precursor by using the HNO_(3)pre-oxidized low-softening-point coal pitch as the low-cost raw material.With further carbonization or KOH activation,the two types of carbon nanofibers(CNF)are fabricated as anode and cathode materials,respectively,towards the dual-carbon PIHC devices.Thanks to its threedimensional interconnected porous conducting network and large layer spacing,the resulted CNF anode material is endowed with high reversible capacities,excellent rate and long cycle stability.Meanwhile,the activated CNF cathode with a large surface area of 2169 m^(2)·g^(-1)exhibits excellent capacitive performance.A PIHC constructed with the two fibrous electrodes delivers an energy density of110.0 Wh·kg^(-1)at 200.0 W kg^(-1),along with a capacitance retention of 83.5%after 10,000 cycles at 1.0 A·g^(-1).The contribution here provides a cost-efficiency avenue and platform for advanced dual-carbon PIHC.展开更多
Carbon peak and carbon neutrality(dual-carbon)are important targets for the international response to climate change.The Silk Road Economic Belt is a strategic resource region and is important for future ecological en...Carbon peak and carbon neutrality(dual-carbon)are important targets for the international response to climate change.The Silk Road Economic Belt is a strategic resource region and is important for future ecological environment and tourism development.Based on the“dual-carbon”targets,the Single index quantification,Multiple index synthesis,and Poly-criteria integration evaluation model were used in this study to measure the coordinated development index of the ecological environment,public service,and tourism economy along the Silk Road Economic Belt and to analyze its spatial and temporal evolution.Further,it explores the dynamic evolution and development trend of the three systems using the Kernel Density and Grey Markov Prediction Model.The results show that the coordinated development index along this region needs to be improved during the study period.Furthermore,the coordinated development index of the Southwest region is relatively higher than that of the Northwest region.From the development trend of the three systems,all of them develop in a stable manner;however,the tourism economy system is easily affected by external disturbances.The coordinated development index of the three systems changes dynamically and tends to be in a good state of coordination.There is a certain spatial and temporal heterogeneity.The gravity center of the coordinated development index has been in the Southwest region.During the forecast period,the coordinated development index along this region will improve significantly,while insufficient and unbalanced development will continue.展开更多
Layered transition metal dichalcogenides are promising candidates for sodium storage but suffering from low intrinsic electronic conductivity and limited interlayer spacing for fast electron/ion transport,which restri...Layered transition metal dichalcogenides are promising candidates for sodium storage but suffering from low intrinsic electronic conductivity and limited interlayer spacing for fast electron/ion transport,which restricts their high-rate capability and cycling stability.In this work,rGO@MoSe_(2)/NAC hierarchical architectures,consisting of conductive reduced graphene oxide(rGO)supported by hollow nanospheres that are rolled from superlattices of alternatively overlapped MoSe_(2)and N-doped amorphous carbon(NAC)monolayers,are synthesized as a highperformance sodium storage anode.Theoretical calculations reveal the intercalation of NAC monolayer between two adjacent MoSe_(2)monolayers improving electronic conductivity of MoSe_(2)in both surface and internal bulk to fully accelerate electron transport and enhance Naþadsorption.The interoverlapped MoSe_(2)/NAC superlattice featuring a wide interlayer expansion(72.3%)of MoSe_(2)dramatically decreases Naþdiffusion barriers for fast insertion/extraction.Moreover,the hollow nanospheres and the rGO conductive network contribute to a robust hiberarchy that can well release internal stress and buffer the volume expansion,thereby enabling outstanding structural stability.Consequently,the rGO@MoSe_(2)/NAC anode exhibits excellent high-rate capability of 194 mAh g^(-1)and ultralong cyclability of 12000 cycles with a low capacity fading rate of 0.0038%per cycle at an ultra-high current of 50 A g^(-)1,delivering the best high-rate cycling performance to date.Remarkably,the Na_(3)V_(2)(PO_(4))_(3)||rGO@MoSe_(2)/NAC full cells also present outstanding cycling stability(600 cycles)at 10C rate,which proves the great potential in fast-charging applications.展开更多
基金supported by the National Center for Basic Sciences of China(No.52388101)the Jiangsu Provincial Department of Science and Technology(China)(No.BK20220012)the Excellent Research Program of Nanjing University(China)(No.ZYJH005).
文摘The“dual-carbon”strategy promotes the development of the wastewater treatment sector and is an important tool for leading science and technology innovations.Based on the global climate change and the new policies introduced by China,this paper described the new needs for the development of wastewater treatment science and technology.It offered a retrospective analysis of the historical trajectory of scientific and technological advancements in this field.Utilizing bibliometrics,it delineated the research hotspots within wastewater treatment,notably highlighting materials genomics,artificial intelligence,and synthetic biology.Furthermore,it posited that,in the future,the field of wastewater treatment should follow the paths of technological innovations with multi-dimensional needs,such as carbon reduction,pollution reduction,health,standardisation,and intellectualisation.The purpose of this paper was to provide references and suggestions for scientific and technological innovations in the field of wastewater treatment,and to contribute to the common endeavor of moving toward a Pollution-Free Planet.
基金financially supported by the National Natural Science Foundation of China(Nos.52072151 and 52171211)Taishan Scholars(No.ts201712050)+2 种基金Jinan Independent Innovative Team(No.2020GXRC015)the Natural Science Doctoral Foundation of Shandong Province(No.ZR2019BB057)the Major Program of Shandong Province Natural Science Foundation(No.ZR2021ZD05)。
文摘Potassium ion hybrid capacitors(PIHC)have promising applications in medium and large-scale energy storage systems due to their high energy/power density,abundant potassium resource and low cost.However,the slow kinetics of battery-type anodes originating from the large-size K+results in a mismatch between the two electrodes,rendering the modest energy density of PIHC.Herein,we first develop an electrospinning strategy to successfully synthesize fibrous precursor by using the HNO_(3)pre-oxidized low-softening-point coal pitch as the low-cost raw material.With further carbonization or KOH activation,the two types of carbon nanofibers(CNF)are fabricated as anode and cathode materials,respectively,towards the dual-carbon PIHC devices.Thanks to its threedimensional interconnected porous conducting network and large layer spacing,the resulted CNF anode material is endowed with high reversible capacities,excellent rate and long cycle stability.Meanwhile,the activated CNF cathode with a large surface area of 2169 m^(2)·g^(-1)exhibits excellent capacitive performance.A PIHC constructed with the two fibrous electrodes delivers an energy density of110.0 Wh·kg^(-1)at 200.0 W kg^(-1),along with a capacitance retention of 83.5%after 10,000 cycles at 1.0 A·g^(-1).The contribution here provides a cost-efficiency avenue and platform for advanced dual-carbon PIHC.
基金supported by the Hebei Province Cultural and Artistic Science Planning and Tourism Research Project[Grant No.HB22-ZD002].
文摘Carbon peak and carbon neutrality(dual-carbon)are important targets for the international response to climate change.The Silk Road Economic Belt is a strategic resource region and is important for future ecological environment and tourism development.Based on the“dual-carbon”targets,the Single index quantification,Multiple index synthesis,and Poly-criteria integration evaluation model were used in this study to measure the coordinated development index of the ecological environment,public service,and tourism economy along the Silk Road Economic Belt and to analyze its spatial and temporal evolution.Further,it explores the dynamic evolution and development trend of the three systems using the Kernel Density and Grey Markov Prediction Model.The results show that the coordinated development index along this region needs to be improved during the study period.Furthermore,the coordinated development index of the Southwest region is relatively higher than that of the Northwest region.From the development trend of the three systems,all of them develop in a stable manner;however,the tourism economy system is easily affected by external disturbances.The coordinated development index of the three systems changes dynamically and tends to be in a good state of coordination.There is a certain spatial and temporal heterogeneity.The gravity center of the coordinated development index has been in the Southwest region.During the forecast period,the coordinated development index along this region will improve significantly,while insufficient and unbalanced development will continue.
基金This work was financially supported by the National Natural Science Foundation of China(Grant Nos.51972092 and 52271208)。
文摘Layered transition metal dichalcogenides are promising candidates for sodium storage but suffering from low intrinsic electronic conductivity and limited interlayer spacing for fast electron/ion transport,which restricts their high-rate capability and cycling stability.In this work,rGO@MoSe_(2)/NAC hierarchical architectures,consisting of conductive reduced graphene oxide(rGO)supported by hollow nanospheres that are rolled from superlattices of alternatively overlapped MoSe_(2)and N-doped amorphous carbon(NAC)monolayers,are synthesized as a highperformance sodium storage anode.Theoretical calculations reveal the intercalation of NAC monolayer between two adjacent MoSe_(2)monolayers improving electronic conductivity of MoSe_(2)in both surface and internal bulk to fully accelerate electron transport and enhance Naþadsorption.The interoverlapped MoSe_(2)/NAC superlattice featuring a wide interlayer expansion(72.3%)of MoSe_(2)dramatically decreases Naþdiffusion barriers for fast insertion/extraction.Moreover,the hollow nanospheres and the rGO conductive network contribute to a robust hiberarchy that can well release internal stress and buffer the volume expansion,thereby enabling outstanding structural stability.Consequently,the rGO@MoSe_(2)/NAC anode exhibits excellent high-rate capability of 194 mAh g^(-1)and ultralong cyclability of 12000 cycles with a low capacity fading rate of 0.0038%per cycle at an ultra-high current of 50 A g^(-)1,delivering the best high-rate cycling performance to date.Remarkably,the Na_(3)V_(2)(PO_(4))_(3)||rGO@MoSe_(2)/NAC full cells also present outstanding cycling stability(600 cycles)at 10C rate,which proves the great potential in fast-charging applications.
