The oxygen reduction reaction(ORR)activity of carbonized ZIF-8(CZ)and its Fe-doped derivatives,CZ-A(doped with ammonium iron(II)sulphate)and CZ-B(doped with iron(II)acetate),were examined in both acidic(0.5 M H_(2)SO_...The oxygen reduction reaction(ORR)activity of carbonized ZIF-8(CZ)and its Fe-doped derivatives,CZ-A(doped with ammonium iron(II)sulphate)and CZ-B(doped with iron(II)acetate),were examined in both acidic(0.5 M H_(2)SO_(4))and basic(0.1 M KOH)electrolytes using a rotating disk electrode setup.These data show that the ORR activity of the Fe-doped catalysts is higher than that of pure CZ,with a higher activity in basic than acidic electrolyte.Extensive materials characterization highlights important differences in the sample crystallinity,morphology,porosity,and chemical composition as a function of the deployed precursor.The performance of the prepared catalysts is also impacted by the Fe precursor selection,highlighting the importance of such synthetic parameters in controlling the density and identify of Fe-Nx active sites.These results demonstrate the potential application of Fe-doped carbonized ZIF-8 catalysts for the ORR in basic electrolyte and offer important knowledge for the future design of non-precious metal fuel cell electrocatalysts.展开更多
Zeolitie imidazolate framework-8(ZIF-8),composed of Zn ions and imidazolate ligands,is a class of metal-organic frameworks,which possesses a similar structure as conventional aluminosilicate zeolites.This material exh...Zeolitie imidazolate framework-8(ZIF-8),composed of Zn ions and imidazolate ligands,is a class of metal-organic frameworks,which possesses a similar structure as conventional aluminosilicate zeolites.This material exhibits inherent porous property,high loading capacity,and pH-sensitive degradation,as well as excep-tional thermal and chemical stability.Extensive research effort has been devoted 10 relevant research aspects ranging from synthesis methods,property characterization to potential applications of ZIF-8.This review focuses on the recent development of ZIF-8 synthesis methods and its promising appications in drug delivery.The potential risks of using ZIF-8 for drug delivery are also summarized.展开更多
Relying on seed method,a double template ZIF-8@ZIF-67 with a layered core-shell structure was made,which is used as a sacrificial template in the next steps.After going through loading process with solvent thermal met...Relying on seed method,a double template ZIF-8@ZIF-67 with a layered core-shell structure was made,which is used as a sacrificial template in the next steps.After going through loading process with solvent thermal method and calcination process,ZIF-8@ZIF-67 was etched and calcined into ternary ZnO/Co_(3)O_(4)/NiO successfully.Besides,benefiting from right amount of the addition of inorganic salts,the optimized ZnO/Co_(3)O_(4)/NiO-2(ZCN-2)shows the outstanding performance in its morphologic structure and electrochemical performance.In the case of a current density of 1 Ag^(-1),the high specific capacitance of 1119.11 Cg^(-1) can be calculated in ZCN-2.In addition,at 10 Ag^(-1),the capacitance value can maintain 93.75%after experiencing 5000 cycles of charging and discharging.The maximum energy density of the assembled ZCN-2//activated carbon(AC)asymmetric supercapacitor can reach 95.82 Wh kg^(-1),which is really outstanding in the present research achievements.After experiencing charge-discharge cycles with the number of 10,000 times in the case of a current density of 10 Ag^(-1),the cycling stability of this supercapacitor can reach 94.53%of the initial value.And after a charge,the device connected by two supercapacitors can make a light emitting diode(LED)shine up to 30 min successfully.展开更多
文摘The oxygen reduction reaction(ORR)activity of carbonized ZIF-8(CZ)and its Fe-doped derivatives,CZ-A(doped with ammonium iron(II)sulphate)and CZ-B(doped with iron(II)acetate),were examined in both acidic(0.5 M H_(2)SO_(4))and basic(0.1 M KOH)electrolytes using a rotating disk electrode setup.These data show that the ORR activity of the Fe-doped catalysts is higher than that of pure CZ,with a higher activity in basic than acidic electrolyte.Extensive materials characterization highlights important differences in the sample crystallinity,morphology,porosity,and chemical composition as a function of the deployed precursor.The performance of the prepared catalysts is also impacted by the Fe precursor selection,highlighting the importance of such synthetic parameters in controlling the density and identify of Fe-Nx active sites.These results demonstrate the potential application of Fe-doped carbonized ZIF-8 catalysts for the ORR in basic electrolyte and offer important knowledge for the future design of non-precious metal fuel cell electrocatalysts.
基金SMF and ZW acknowledge the financial support from the Natural Science Foundation of Tianjin(No.19JCYBJC28400)。
文摘Zeolitie imidazolate framework-8(ZIF-8),composed of Zn ions and imidazolate ligands,is a class of metal-organic frameworks,which possesses a similar structure as conventional aluminosilicate zeolites.This material exhibits inherent porous property,high loading capacity,and pH-sensitive degradation,as well as excep-tional thermal and chemical stability.Extensive research effort has been devoted 10 relevant research aspects ranging from synthesis methods,property characterization to potential applications of ZIF-8.This review focuses on the recent development of ZIF-8 synthesis methods and its promising appications in drug delivery.The potential risks of using ZIF-8 for drug delivery are also summarized.
基金the National Natural Science Foundation of China(61571245)Natural Science Fund Project of Colleges in Jiangsu Province(16KJB430008)the College Students Innovative Practice Fund of Jiangsu University Industrial Center(ZXJG2020058)for the help on funds for experiment sincerely。
文摘Relying on seed method,a double template ZIF-8@ZIF-67 with a layered core-shell structure was made,which is used as a sacrificial template in the next steps.After going through loading process with solvent thermal method and calcination process,ZIF-8@ZIF-67 was etched and calcined into ternary ZnO/Co_(3)O_(4)/NiO successfully.Besides,benefiting from right amount of the addition of inorganic salts,the optimized ZnO/Co_(3)O_(4)/NiO-2(ZCN-2)shows the outstanding performance in its morphologic structure and electrochemical performance.In the case of a current density of 1 Ag^(-1),the high specific capacitance of 1119.11 Cg^(-1) can be calculated in ZCN-2.In addition,at 10 Ag^(-1),the capacitance value can maintain 93.75%after experiencing 5000 cycles of charging and discharging.The maximum energy density of the assembled ZCN-2//activated carbon(AC)asymmetric supercapacitor can reach 95.82 Wh kg^(-1),which is really outstanding in the present research achievements.After experiencing charge-discharge cycles with the number of 10,000 times in the case of a current density of 10 Ag^(-1),the cycling stability of this supercapacitor can reach 94.53%of the initial value.And after a charge,the device connected by two supercapacitors can make a light emitting diode(LED)shine up to 30 min successfully.
