Two-dimensional(2 D)material MXenes have been intensively concerned in energy-storage field due to these unique properties of metallic-like conductivity,good hydrophilicity and high volumetric capacity.However,the sel...Two-dimensional(2 D)material MXenes have been intensively concerned in energy-storage field due to these unique properties of metallic-like conductivity,good hydrophilicity and high volumetric capacity.However,the self-restocking of ultra-thin 2 D materials seriously hinders these performances,which significantly inhibits the full exploitation of MXenes in the field of energy storage.To solve this issue,a strategy to prepare delaminated Ti_(3)C_(2)T_(x)(MXene)nanoflakes/reduced graphene oxide(r GO)composites is proposed using the electrostatic self-assembly between positively charged Ti_(3)C_(2)T_(x) with tetrabutylammonium ion(TBA+)modification and negatively charged graphene.The nanoflakes of Ti_(3)C_(2)T_(x)/rGO are well dispersed and arranged in a face-to-face structure to effectively alleviate the self-restacking and provide more electroactive sites for accessible of electrolyte ions.The prepared delaminated Ti_(3)C_(2)T_(x)/r GO anode shows a high reversible capacity up to 1394 m Ah g^(-1) at a current density of 50 m A g^(-1).Moreover,a lithium-ion capacitor(LIC)was assembled with delaminated Ti_(3)C_(2)T_(x)/r GO anode and activated carbon(AC)cathode which can exhibit a specific capacity of 70.7 F g^(-1) at a current density of 0.1 A g^(-1) and deliver an ultrahigh energy density of 114 Wh kg^(-1) at a relatively high power density of 3125 W kg^(-1).These good electrochemical performances demonstrate the potential of delaminated Ti_(3)C_(2)T_(x)/r GO as an anode material for lithium-ion capacitors.展开更多
目的通过对临床文献的研究,系统评价膈下逐瘀汤治疗气滞血瘀型原发性痛经(Primary Dysmenorrhea,PD)的有效性及安全性。方法计算机检索PubMed、Embase、Cochrane Library、Web of Science、中国知网(CNKI)、万方数据库(WF)、中国生物医...目的通过对临床文献的研究,系统评价膈下逐瘀汤治疗气滞血瘀型原发性痛经(Primary Dysmenorrhea,PD)的有效性及安全性。方法计算机检索PubMed、Embase、Cochrane Library、Web of Science、中国知网(CNKI)、万方数据库(WF)、中国生物医学文献数据库(CBM)、维普期刊数据库(VIP)等国内外数据库中有关膈下逐瘀汤治疗原发性痛经的随机对照试验(RCTs),检索时限均为数据库建立之日至2020年10月15日,由2名研究人员筛选文献并提取相关结局指标,经偏倚风险评估后使用RevMan 5.3.0软件对纳入研究进行Meta分析。结果对所包含1330例患者的16篇纳入文献进行Meta分析,结果显示:治疗组治疗总有效率高于对照组[亚组①RR=1.12,95%CI(1.03,1.22),Z=2.58,P=0.010;亚组②RR=1.39,95%CI(1.29,1.49),Z=9.23,P<0.0001];治疗组视觉模拟评分(VAS)低于对照组[SMD=-1.81,95%CI(-2.76,-0.86),Z=3.75,P=0.0002];治疗后治疗组痛经症状评分低于对照组[SMD=-2.21,95%CI(-2.90,-1.51),Z=6.22,P<0.00001];治疗后治疗组复发情况优于对照组[RR=0.31,95%CI(0.14,0.66),Z=3.01,P=0.003];已有数据尚不能证明治疗组不良反应发生率低于对照组[RR=0.11,95%CI(0.16,2.29),Z=0.73,P=0.46],但不良反应均较轻微。结论膈下逐瘀汤治疗气滞血瘀型PD具有显著疗效,能有效改善疼痛症状及痛经相关症状,且复发率较低,不良反应较轻微,安全性较好。展开更多
基金supported by the National Natural Science Foundation of China (51677182 and 51822706)the Dalian National Laboratory for Clean Energy (DNL) Cooperation Fund, CAS (DNL201915 and DNL201912)+1 种基金the Beijing Municipal Science and Technology Commission (Z181100000118006)the Key Research Program of Frontier Sciences, CAS (ZDBS-LY-JSC047)。
文摘Two-dimensional(2 D)material MXenes have been intensively concerned in energy-storage field due to these unique properties of metallic-like conductivity,good hydrophilicity and high volumetric capacity.However,the self-restocking of ultra-thin 2 D materials seriously hinders these performances,which significantly inhibits the full exploitation of MXenes in the field of energy storage.To solve this issue,a strategy to prepare delaminated Ti_(3)C_(2)T_(x)(MXene)nanoflakes/reduced graphene oxide(r GO)composites is proposed using the electrostatic self-assembly between positively charged Ti_(3)C_(2)T_(x) with tetrabutylammonium ion(TBA+)modification and negatively charged graphene.The nanoflakes of Ti_(3)C_(2)T_(x)/rGO are well dispersed and arranged in a face-to-face structure to effectively alleviate the self-restacking and provide more electroactive sites for accessible of electrolyte ions.The prepared delaminated Ti_(3)C_(2)T_(x)/r GO anode shows a high reversible capacity up to 1394 m Ah g^(-1) at a current density of 50 m A g^(-1).Moreover,a lithium-ion capacitor(LIC)was assembled with delaminated Ti_(3)C_(2)T_(x)/r GO anode and activated carbon(AC)cathode which can exhibit a specific capacity of 70.7 F g^(-1) at a current density of 0.1 A g^(-1) and deliver an ultrahigh energy density of 114 Wh kg^(-1) at a relatively high power density of 3125 W kg^(-1).These good electrochemical performances demonstrate the potential of delaminated Ti_(3)C_(2)T_(x)/r GO as an anode material for lithium-ion capacitors.
