Lithium batteries have been widely used in all over the world for its high energy density, long-term cycle stability. While the resources of lithium metal and transition metal are limited, which restrict their applica...Lithium batteries have been widely used in all over the world for its high energy density, long-term cycle stability. While the resources of lithium metal and transition metal are limited, which restrict their applications in the grid energy storage. Dual ion sodium batteries(DISBs) possess higher energy density,especially owning high power density for its higher operating voltage(> 4.5 V). Nevertheless, the poor oxidation tolerance of carbonate electrolyte and the co-intercalation of solvents accompanied with anions are main obstacles to make the DISBs commercialization. Herein, a physical barrier(artificial SEI film) is pre-constructed in the Na||graphite batteries to solve these thorny problems. With the CSMG(covered SEI on modified graphite), batteries deliver higher capacity 40 mAh/g even under the current density of 300 mA/g and the capacity retention maintains very well after 100 cycles at a high operating voltage.Moreover, the function mechanism was revealed by in-situ XRD, demonstrating that the pre-constructed SEI can effectively suppress the irreversible phase transition and exfoliation of graphite, resulting from the co-intercalation of anions. Additionally, the work voltage windows of carbonate electrolyte are significantly broadened by establishing electrode/electrolyte interphase. This method opens up an avenue for the practical application of DISBs on the grid energy storage and other fields.展开更多
P2-type layered oxides are receiving significant interest due to their superior structure and intrinsic performances.There are strenuous attempts to balance the structure stability,phase transition as well as desirabl...P2-type layered oxides are receiving significant interest due to their superior structure and intrinsic performances.There are strenuous attempts to balance the structure stability,phase transition as well as desirable electrochemical performances by inducing anion/cation ions,changing morphology,adjusting valence,etc.In this work,several same-period elements of Sc,Ti,V,Cr,Fe,Cu and Zn are doped into Na_(0.50)Li_(0.08)Mn_(0.60)Co_(0.16)Ni_(0.16)O_(2)cathodes,which are manipulated by ions radii and valence state,further studied by operando X-ray powder diffraction patterns(XRD).As a result,the Cu^(2+)doped cathode performed higher rate capacities(as high as 86 mAh/g even at 10 C)and more stable structures(capacity retention of~89.4%for 100 cycles),which owing to the synergistic effect among the tightened TMO_(2)layer,enlarged d-spacing,reduce O-O electrostatic repulsion,ameliorate lattice distortion as well as mitigate ordering of Na^(+)/vacancy.展开更多
In this work,an adsorbent,which we call MnPT,was prepared by combining MnO_(2),polyethylenimine and tannic acid,and exhibited efficient performance for Cu(Ⅱ) and Cr(VI) removal from aqueous solution.The oxygen/nitrog...In this work,an adsorbent,which we call MnPT,was prepared by combining MnO_(2),polyethylenimine and tannic acid,and exhibited efficient performance for Cu(Ⅱ) and Cr(VI) removal from aqueous solution.The oxygen/nitrogen-containing functional groups on the surface of MnPT might increase the enrichment of metal ions by complexation.The maximum adsorption capacities of MnPT for Cu(Ⅱ) and Cr(Ⅵ) were 121.5 and 790.2 mg·g^(-1),respectively.The surface complexation formation model was used to elucidate the physicochemical interplay in the process of Cu(Ⅱ) and Cr(Ⅵ) co-adsorption on MnPT.Electrostatic force,solvation action,adsorbate-adsorbate lateral interaction,and complexation were involved in the spontaneous adsorption process.Physical electrostatic action was dominant in the initial stage,whereas chemical action was the driving force leading to adsorption equilibrium.It should be noted that after adsorption on the surface of MnPT,Cr(Ⅵ) reacted with some reducing functional groups(hydroxylamine-NH_(2))and was converted into Cr(Ⅲ).The adsorption capacity declined by 12% after recycling five times.Understanding the adsorption mechanism might provide a technical basis for the procedural design of heavy metal adsorbents.This MnPT nanocomposite has been proven to be a low-cost,efficient,and promising adsorbent for removing heavy metal ions from wastewater.展开更多
Background:Sepsis is a serious disease caused by infection.Aminophylline has anti-asthma and anti-inflammatory effects.We aimed to explore the safety and effect of aminophylline in sepsis.Methods:We conducted a clinic...Background:Sepsis is a serious disease caused by infection.Aminophylline has anti-asthma and anti-inflammatory effects.We aimed to explore the safety and effect of aminophylline in sepsis.Methods:We conducted a clinical randomized controlled trial involving 100 patients diagnosed with sepsis within 48 h after intensive care unit(ICU)admission in two sites.All patients were randomized in a 1:1 ratio to receive standard therapy with or without aminophylline.The primary clinical outcome was all-cause mortality at 28 days.Results:From September 27,2018 to February 12,2020,we screened 277 septic patients and eventually enrolled 100 patients,with 50 assigned to the aminophylline group and 50 to the usual-care group.At 28 days,7 of 50 patients(14.0%)in the aminophylline group had died,compared with 16 of 50(32.0%)in the usual-care group(P=0.032).Cox regression showed that the aminophylline group had a lower hazard of death(hazard ratio=0.312,95%confidence interval:0.129–0.753).Compared with the usual-care group,patients in the aminophylline group had a longer survival time(P=0.039 by the log-rank test).The effects of aminophylline on vasopressor dose,oxygenation index,and sequential organ failure assessment score were timedependent with treatment.There were no significant differences in total hospitalization days,ICU hospitalization days,and rates of serious adverse events(all P>0.05).No adverse events were observed in the trial.Conclusions:Aminophylline as an adjunct therapy could significantly reduce the risk of death and prolong the survival time of patients with sepsis.Trial registration:ChiCTR.org.cn,ChiCTR1800019173.展开更多
The specific capacities and power performances of conventional cathode materials are still needed to improve in order to meet the demand for electrical vehicles.Li-rich layered oxide delivers a high specific capacity,...The specific capacities and power performances of conventional cathode materials are still needed to improve in order to meet the demand for electrical vehicles.Li-rich layered oxide delivers a high specific capacity,but poor rate performances.Chemical doping is an effective way to address this challenge due to the expanded crystal lattice.Unlike a single ion substitution in the literature,here Li-rich layered oxides were doped by Sn and K to achieve the favorite rate performance,where Sn and K were assumed to replace transition metal ion and Li ion,respectively.Results indicate the co-doped samples result in an increasing capacity retention by more than 40%from 107.9(contrast sample)to 151.5 mAh g^(-1)(co-doped sample)at 10 C-rate.Electrochemical impedance spectroscopy(EIS)and calculated diffusion coefficient of Li^(+) also confirmed the favorite rate performances for co-doped sample.Combining results of Rietveld structure refinement,we proposed that the reason for rate performances comes from the enlarged crystal lattices,which provides a smooth diffusion tunnel for Lithium ions during the charge/discharge processes.The as-adopted method provides a possibility to achieve the improved rate performances by co-doping big-size ions at the different crystal sites.展开更多
基金financially supported by the National Natural Science Foundation of China (Nos. 51672071, 51802085, 51772296 and 51902090)“111 Project” (No. D17007)+2 种基金the National students' platform for innovation and entrepreneurship training program (No. 201910476010)the China Postdoctoral Science Foundation (No. 2019 M652546)the Henan Province Postdoctoral StartUp Foundation (No. 1901017)。
文摘Lithium batteries have been widely used in all over the world for its high energy density, long-term cycle stability. While the resources of lithium metal and transition metal are limited, which restrict their applications in the grid energy storage. Dual ion sodium batteries(DISBs) possess higher energy density,especially owning high power density for its higher operating voltage(> 4.5 V). Nevertheless, the poor oxidation tolerance of carbonate electrolyte and the co-intercalation of solvents accompanied with anions are main obstacles to make the DISBs commercialization. Herein, a physical barrier(artificial SEI film) is pre-constructed in the Na||graphite batteries to solve these thorny problems. With the CSMG(covered SEI on modified graphite), batteries deliver higher capacity 40 mAh/g even under the current density of 300 mA/g and the capacity retention maintains very well after 100 cycles at a high operating voltage.Moreover, the function mechanism was revealed by in-situ XRD, demonstrating that the pre-constructed SEI can effectively suppress the irreversible phase transition and exfoliation of graphite, resulting from the co-intercalation of anions. Additionally, the work voltage windows of carbonate electrolyte are significantly broadened by establishing electrode/electrolyte interphase. This method opens up an avenue for the practical application of DISBs on the grid energy storage and other fields.
基金financially supported by the National Natural Science Foundation of China(Nos.52263010,51902090)Henan Key Research Project Plan for Higher Education Institutions(No.23A150038)+5 种基金2023 Introduction of studying abroad talent program,“"111"Project(No.D17007)Henan Provincial Key Scientific Research Project of Colleges and Universities(No.23A150038)Key Scientific Research Project of Education Department of Henan Province(No.22A150042)the National students'platform for innovation and entrepreneurship training program(No.201910476010)the China Postdoctoral Science Foundation(No.2019 M652546)the Henan Province Postdoctoral Start-Up Foundation(No.1901017).
文摘P2-type layered oxides are receiving significant interest due to their superior structure and intrinsic performances.There are strenuous attempts to balance the structure stability,phase transition as well as desirable electrochemical performances by inducing anion/cation ions,changing morphology,adjusting valence,etc.In this work,several same-period elements of Sc,Ti,V,Cr,Fe,Cu and Zn are doped into Na_(0.50)Li_(0.08)Mn_(0.60)Co_(0.16)Ni_(0.16)O_(2)cathodes,which are manipulated by ions radii and valence state,further studied by operando X-ray powder diffraction patterns(XRD).As a result,the Cu^(2+)doped cathode performed higher rate capacities(as high as 86 mAh/g even at 10 C)and more stable structures(capacity retention of~89.4%for 100 cycles),which owing to the synergistic effect among the tightened TMO_(2)layer,enlarged d-spacing,reduce O-O electrostatic repulsion,ameliorate lattice distortion as well as mitigate ordering of Na^(+)/vacancy.
基金supported by the National Natural Science Foundation of China(Grant Nos.41573103,41340037)the Shandong Provincial Key Research and Development Program(Grant Nos.2017GSF16105,2018GGX102004,2018GSF117007)the Taishan Scholar Program(Grant No.ts201712045)of Shandong Province of China.
文摘In this work,an adsorbent,which we call MnPT,was prepared by combining MnO_(2),polyethylenimine and tannic acid,and exhibited efficient performance for Cu(Ⅱ) and Cr(VI) removal from aqueous solution.The oxygen/nitrogen-containing functional groups on the surface of MnPT might increase the enrichment of metal ions by complexation.The maximum adsorption capacities of MnPT for Cu(Ⅱ) and Cr(Ⅵ) were 121.5 and 790.2 mg·g^(-1),respectively.The surface complexation formation model was used to elucidate the physicochemical interplay in the process of Cu(Ⅱ) and Cr(Ⅵ) co-adsorption on MnPT.Electrostatic force,solvation action,adsorbate-adsorbate lateral interaction,and complexation were involved in the spontaneous adsorption process.Physical electrostatic action was dominant in the initial stage,whereas chemical action was the driving force leading to adsorption equilibrium.It should be noted that after adsorption on the surface of MnPT,Cr(Ⅵ) reacted with some reducing functional groups(hydroxylamine-NH_(2))and was converted into Cr(Ⅲ).The adsorption capacity declined by 12% after recycling five times.Understanding the adsorption mechanism might provide a technical basis for the procedural design of heavy metal adsorbents.This MnPT nanocomposite has been proven to be a low-cost,efficient,and promising adsorbent for removing heavy metal ions from wastewater.
基金the United Fund of National Natural Science Foundation of China(No.U2004110)the National Natural Science Foundation of China(No.82172129)the Medical Science and Technology Tackling Plan Provincial and Ministerial Major Projects of Henan Province(No.SBGJ202101015).
文摘Background:Sepsis is a serious disease caused by infection.Aminophylline has anti-asthma and anti-inflammatory effects.We aimed to explore the safety and effect of aminophylline in sepsis.Methods:We conducted a clinical randomized controlled trial involving 100 patients diagnosed with sepsis within 48 h after intensive care unit(ICU)admission in two sites.All patients were randomized in a 1:1 ratio to receive standard therapy with or without aminophylline.The primary clinical outcome was all-cause mortality at 28 days.Results:From September 27,2018 to February 12,2020,we screened 277 septic patients and eventually enrolled 100 patients,with 50 assigned to the aminophylline group and 50 to the usual-care group.At 28 days,7 of 50 patients(14.0%)in the aminophylline group had died,compared with 16 of 50(32.0%)in the usual-care group(P=0.032).Cox regression showed that the aminophylline group had a lower hazard of death(hazard ratio=0.312,95%confidence interval:0.129–0.753).Compared with the usual-care group,patients in the aminophylline group had a longer survival time(P=0.039 by the log-rank test).The effects of aminophylline on vasopressor dose,oxygenation index,and sequential organ failure assessment score were timedependent with treatment.There were no significant differences in total hospitalization days,ICU hospitalization days,and rates of serious adverse events(all P>0.05).No adverse events were observed in the trial.Conclusions:Aminophylline as an adjunct therapy could significantly reduce the risk of death and prolong the survival time of patients with sepsis.Trial registration:ChiCTR.org.cn,ChiCTR1800019173.
基金This work was financially supported by the National Natural Science Foundation of China under Grant No.51772296,51672071,51802085the Foundation for State Key Laboratory of Biochemical Engineering,and“111”Project(D17007).
文摘The specific capacities and power performances of conventional cathode materials are still needed to improve in order to meet the demand for electrical vehicles.Li-rich layered oxide delivers a high specific capacity,but poor rate performances.Chemical doping is an effective way to address this challenge due to the expanded crystal lattice.Unlike a single ion substitution in the literature,here Li-rich layered oxides were doped by Sn and K to achieve the favorite rate performance,where Sn and K were assumed to replace transition metal ion and Li ion,respectively.Results indicate the co-doped samples result in an increasing capacity retention by more than 40%from 107.9(contrast sample)to 151.5 mAh g^(-1)(co-doped sample)at 10 C-rate.Electrochemical impedance spectroscopy(EIS)and calculated diffusion coefficient of Li^(+) also confirmed the favorite rate performances for co-doped sample.Combining results of Rietveld structure refinement,we proposed that the reason for rate performances comes from the enlarged crystal lattices,which provides a smooth diffusion tunnel for Lithium ions during the charge/discharge processes.The as-adopted method provides a possibility to achieve the improved rate performances by co-doping big-size ions at the different crystal sites.