Uncontrolled dendrite growth,sluggish reaction kinetics,and drastic side reactions on the anodeelectrolyte interface are the main obstacles that restrict the application prospect of aqueous zinc-ion batteries.Traditio...Uncontrolled dendrite growth,sluggish reaction kinetics,and drastic side reactions on the anodeelectrolyte interface are the main obstacles that restrict the application prospect of aqueous zinc-ion batteries.Traditional glass fiber(GF)separator with chemical inertness is almost ineffective in restricting these challenges.Herein,inspired by the ionic enrichment behavior of seaweed plants,a facile biomass species,anionic sodium alginate(SA),is purposely decorated on the commercial GF separator to tackle these issues towards Zn anode.Benefiting from the abundant zincophilic functional groups and superior mechanical strength properties,the as-obtained SA@GF separator could act as ion pump to boost the Zn^(2+)transference number(0.68),reduce the de-solvation energy barrier of hydrated Zn^(2+),and eliminate the undesired concentration polarization effect,which are verified by experimental tests,theoretical calculations,and finite element simulation,respectively.Based on these efficient modulation mechanisms,the SA@GF separator can synchronously achieve well-aligned Zn deposition and the suppression of parasitic side-reactions.Therefore,the Zn‖Zn coin cell integrated with SA@GF separator could yield a prolonged calendar lifespan over 1230 h(1 mA cm^(-2)and 1 mAh cm^(-2)),exhibiting favorable competitiveness with previously reported separator modification strategies.Impressively,the Zn-MnO_(2)full and pouch cell assembled with the SA@GF separator also delivered superior cycling stability and rate performance,further verifying its practical application effect.This work provides a new design philosophy to stabilize the Zn anode from the aspect of separator.展开更多
Dye pollution is a common pollutant in wastewater that poses a serious threat to human health.Layered double hydroxide(LDH)is a commonly used adsorbent for dye removal.However,its adsorption efficiency is significantl...Dye pollution is a common pollutant in wastewater that poses a serious threat to human health.Layered double hydroxide(LDH)is a commonly used adsorbent for dye removal.However,its adsorption efficiency is significantly limited by the limited adsorption active sites of the adsorbent.In this paper,a defects-rich MgFe LDH adsorbent for anionic dye wastewater was synthesized by a simple hydrothermal method and alkaline etching.Different analytical techniques,such as XRD,FT-IR,SEM,TEM,XPS,and N2 adsorption-desorption isotherm,were used to verify the chemical composition and surface characteristics of the materials,and the effects of pH,temperature,and contact time on the adsorption effect of methyl orange and the adsorption mechanism were analyzed.Alkaline etching of Al and Zn in the laminate generated defects that expose unsaturated coordination centers and create abundant adsorption sites,which can electrostatically attract and coordinate with dye ions.At 25℃,the adsorption capacity of MgFe LDH with Al etched and MgFe LDH with Zn etched for methyl orange dye reached 1722 mg·g^(-1 ) and 1685 mg·g^(-1 ),respectively,much higher than that of MgFe LDH(544 mg·g^(-1 )).This work provides a promising method for the removal of dye wastewater by adsorption and a new idea for the design and development of high-performance dye wastewater adsorbents.展开更多
With the emerging diverse applications in data centers,the demands on quality of service in data centers also become diverse,such as high throughput of elephant flows and low latency of deadline-sensitive flows.Howeve...With the emerging diverse applications in data centers,the demands on quality of service in data centers also become diverse,such as high throughput of elephant flows and low latency of deadline-sensitive flows.However,traditional TCPs are ill-suited to such situations and always result in the inefficiency(e.g.missing the flow deadline,inevitable throughput collapse)of data transfers.This further degrades the user-perceived quality of service(QoS)in data centers.To reduce the flow completion time of mice and deadline-sensitive flows along with promoting the throughput of elephant flows,an efficient and deadline-aware priority-driven congestion control(PCC)protocol,which grants mice and deadline-sensitive flows the highest priority,is proposed in this paper.Specifically,PCC computes the priority of different flows according to the size of transmitted data,the remaining data volume,and the flows’deadline.Then PCC adjusts the congestion window according to the flow priority and the degree of network congestion.Furthermore,switches in data centers control the input/output of packets based on the flow priority and the queue length.Different from existing TCPs,to speed up the data transfers of mice and deadline-sensitive flows,PCC provides an effective method to compute and encode the flow priority explicitly.According to the flow priority,switches can manage packets efficiently and ensure the data transfers of high priority flows through a weighted priority scheduling with minor modification.The experimental results prove that PCC can improve the data transfer performance of mice and deadline-sensitive flows while guaranting the throughput of elephant flows.展开更多
基金supported by research grants from the National Natural Science Foundation of China(52173235,22008193,52106110)the Key Research and Development Project of Hainan Province(ZDYF2024SHFZ038)+2 种基金Venture&Innovation Support Program for Chongqing Overseas Returnees(CX2021018)Research Foundation of Chongqing University of Science and Technology(ckrc2021071)Numerical computations were performed on Hefei Advanced Computing Center.
文摘Uncontrolled dendrite growth,sluggish reaction kinetics,and drastic side reactions on the anodeelectrolyte interface are the main obstacles that restrict the application prospect of aqueous zinc-ion batteries.Traditional glass fiber(GF)separator with chemical inertness is almost ineffective in restricting these challenges.Herein,inspired by the ionic enrichment behavior of seaweed plants,a facile biomass species,anionic sodium alginate(SA),is purposely decorated on the commercial GF separator to tackle these issues towards Zn anode.Benefiting from the abundant zincophilic functional groups and superior mechanical strength properties,the as-obtained SA@GF separator could act as ion pump to boost the Zn^(2+)transference number(0.68),reduce the de-solvation energy barrier of hydrated Zn^(2+),and eliminate the undesired concentration polarization effect,which are verified by experimental tests,theoretical calculations,and finite element simulation,respectively.Based on these efficient modulation mechanisms,the SA@GF separator can synchronously achieve well-aligned Zn deposition and the suppression of parasitic side-reactions.Therefore,the Zn‖Zn coin cell integrated with SA@GF separator could yield a prolonged calendar lifespan over 1230 h(1 mA cm^(-2)and 1 mAh cm^(-2)),exhibiting favorable competitiveness with previously reported separator modification strategies.Impressively,the Zn-MnO_(2)full and pouch cell assembled with the SA@GF separator also delivered superior cycling stability and rate performance,further verifying its practical application effect.This work provides a new design philosophy to stabilize the Zn anode from the aspect of separator.
基金the National Natural Science Foundation of China(21908012)the Natural Science Foundation of Chongqing,China(cstc2020jcyj-msxmX0875 and CSTB2022BSXM-JSX0021)+2 种基金Chongqing Postdoctoral Research Project Special Funding(2023CQBSHTB3110)Postgraduate Research and Innovation Project of Chongqing University of Science and Technology(YKJCX2220541)Major Enterprise Demand Projects with Open Bidding for Selecting the Best Candidates in Yichun City,China(2023JBGSXM05)for the financial support to this work.
文摘Dye pollution is a common pollutant in wastewater that poses a serious threat to human health.Layered double hydroxide(LDH)is a commonly used adsorbent for dye removal.However,its adsorption efficiency is significantly limited by the limited adsorption active sites of the adsorbent.In this paper,a defects-rich MgFe LDH adsorbent for anionic dye wastewater was synthesized by a simple hydrothermal method and alkaline etching.Different analytical techniques,such as XRD,FT-IR,SEM,TEM,XPS,and N2 adsorption-desorption isotherm,were used to verify the chemical composition and surface characteristics of the materials,and the effects of pH,temperature,and contact time on the adsorption effect of methyl orange and the adsorption mechanism were analyzed.Alkaline etching of Al and Zn in the laminate generated defects that expose unsaturated coordination centers and create abundant adsorption sites,which can electrostatically attract and coordinate with dye ions.At 25℃,the adsorption capacity of MgFe LDH with Al etched and MgFe LDH with Zn etched for methyl orange dye reached 1722 mg·g^(-1 ) and 1685 mg·g^(-1 ),respectively,much higher than that of MgFe LDH(544 mg·g^(-1 )).This work provides a promising method for the removal of dye wastewater by adsorption and a new idea for the design and development of high-performance dye wastewater adsorbents.
基金supported part by the National Natural Science Foundation of China(61601252,61801254)Public Technology Projects of Zhejiang Province(LG-G18F020007)+1 种基金Zhejiang Provincial Natural Science Foundation of China(LY20F020008,LY18F020011,LY20F010004)K.C.Wong Magna Fund in Ningbo University。
文摘With the emerging diverse applications in data centers,the demands on quality of service in data centers also become diverse,such as high throughput of elephant flows and low latency of deadline-sensitive flows.However,traditional TCPs are ill-suited to such situations and always result in the inefficiency(e.g.missing the flow deadline,inevitable throughput collapse)of data transfers.This further degrades the user-perceived quality of service(QoS)in data centers.To reduce the flow completion time of mice and deadline-sensitive flows along with promoting the throughput of elephant flows,an efficient and deadline-aware priority-driven congestion control(PCC)protocol,which grants mice and deadline-sensitive flows the highest priority,is proposed in this paper.Specifically,PCC computes the priority of different flows according to the size of transmitted data,the remaining data volume,and the flows’deadline.Then PCC adjusts the congestion window according to the flow priority and the degree of network congestion.Furthermore,switches in data centers control the input/output of packets based on the flow priority and the queue length.Different from existing TCPs,to speed up the data transfers of mice and deadline-sensitive flows,PCC provides an effective method to compute and encode the flow priority explicitly.According to the flow priority,switches can manage packets efficiently and ensure the data transfers of high priority flows through a weighted priority scheduling with minor modification.The experimental results prove that PCC can improve the data transfer performance of mice and deadline-sensitive flows while guaranting the throughput of elephant flows.
