LiNi_(0.5)Mn_(1.5)O_(4) and LiMn_(2)O_(4) with novel spinel morphology were synthesized by a hydrothermal and postcalcination process.The synthesized LiMn_(2)O_(4) particles(5–10 lm)are uniform hexahedron,while the L...LiNi_(0.5)Mn_(1.5)O_(4) and LiMn_(2)O_(4) with novel spinel morphology were synthesized by a hydrothermal and postcalcination process.The synthesized LiMn_(2)O_(4) particles(5–10 lm)are uniform hexahedron,while the LiNi_(0.5)Mn_(1.5)O_(4) has spindle-like morphology with the long axis 10–15 lm,short axis 5–8 lm.Both LiMn_(2)O_(4) and LiNi_(0.5)Mn_(1.5)O_(4) show high capacity when used as cathode materials for Li-ion batteries.In the voltage range of 2.5–5.5 V at room temperature,the LiNi_(0.5)Mn_(1.5)O_(4) has a high discharge capacity of 135.04 mA·h·g^(-1) at 20 mAg^(-1),which is close to 147 mA·h·g^(-1)(theoretical capacity of LiNi_(0.5)Mn_(1.5)O_(4)).The discharge capacity of LiMn_(2)O_(4) is 131.08 mA·h·g^(-1) at 20 mAg^(-1).Moreover,the LiNi_(0.5)Mn_(1.5)O_(4) shows a higher capacity retention(76%)compared to that of LiMn_(2)O_(4)(61%)after 50 cycles.The morphology and structure of LiMn_(2)O_(4) and LiNi_(0.5)Mn_(1.5)O_(4) are well kept even after cycling as demonstrated by SEM and XRD on cycled LiMn_(2)O_(4) and LiNi_(0.5)Mn_(1.5)O_(4) electrodes.展开更多
Toward the imperative treatment of the industrial wastewater containing 4-nitrophenol(4-NP)and industrial solid waste red mud(RM),an innovative approach of“Using waste to treat waste”is developed.Valuable element Al...Toward the imperative treatment of the industrial wastewater containing 4-nitrophenol(4-NP)and industrial solid waste red mud(RM),an innovative approach of“Using waste to treat waste”is developed.Valuable element Al is leached from the RM first,the resultant NaAlO_(2) solution is hydrothermally converted toγ-AlOOH hierarchical porous microspheres(RMγ-AlOOH HPMSs,average diameter:2.0μm,SBET:77.81 m^(2) g^(-1),pore volume:0.38 cm^(3) g^(-1))in the presence of urea.The subsequent mild thermal conversion results inγ-Al_(2)O_(3) hierarchical porous microspheres(RMγ-Al_(2)O_(3) HPMSs).Both of the RMγ-AlOOH and RMγ-Al_(2)O_(3) HPMSs are employed as the Pd catalyst support for the catalytic reduction of 4-NP.Particularly,the as-obtained composite Pd/RMγ-AlOOH and Pd/RMγ-Al_(2)O_(3) exhibit excellent catalytic activities with superior knor as 8204.5 and 4831.4 s^(-1) g^(-1),respectively,significantly higher than that of most Pd based catalysts.Moreover,the excellent catalytic stability and durability of the Pd/RMγ-AlOOH and Pd/RMγ-Al_(2)O_(3) within 10 successive cycles of reduction enable the present industrial solid waste RM inducedγ-AlOOH andγ-Al_(2)O_(3) HPMSs as great promising Pd catalyst support for the reduction of the industrial wastewater containing 4-NP.展开更多
基金the National Natural Science Foundation of China(52022109 and 51834008)Beijing Municipal Natural Science Foundation(2202047)+1 种基金Science Foundation of China University of Petroleum,Beijing(2462018YJRC041 and 2462020YXZZ016)the Opening Project of State Key Laboratory of Advanced Chemical Power Sources(SKL-ACPS-C-20).
文摘LiNi_(0.5)Mn_(1.5)O_(4) and LiMn_(2)O_(4) with novel spinel morphology were synthesized by a hydrothermal and postcalcination process.The synthesized LiMn_(2)O_(4) particles(5–10 lm)are uniform hexahedron,while the LiNi_(0.5)Mn_(1.5)O_(4) has spindle-like morphology with the long axis 10–15 lm,short axis 5–8 lm.Both LiMn_(2)O_(4) and LiNi_(0.5)Mn_(1.5)O_(4) show high capacity when used as cathode materials for Li-ion batteries.In the voltage range of 2.5–5.5 V at room temperature,the LiNi_(0.5)Mn_(1.5)O_(4) has a high discharge capacity of 135.04 mA·h·g^(-1) at 20 mAg^(-1),which is close to 147 mA·h·g^(-1)(theoretical capacity of LiNi_(0.5)Mn_(1.5)O_(4)).The discharge capacity of LiMn_(2)O_(4) is 131.08 mA·h·g^(-1) at 20 mAg^(-1).Moreover,the LiNi_(0.5)Mn_(1.5)O_(4) shows a higher capacity retention(76%)compared to that of LiMn_(2)O_(4)(61%)after 50 cycles.The morphology and structure of LiMn_(2)O_(4) and LiNi_(0.5)Mn_(1.5)O_(4) are well kept even after cycling as demonstrated by SEM and XRD on cycled LiMn_(2)O_(4) and LiNi_(0.5)Mn_(1.5)O_(4) electrodes.
基金supported by the State Key Laboratory of Organic-Inorganic Composites (No.oic-202101009)State Key Laboratory of Chemical Engineering (No.SKL-ChE-21A02),China。
文摘Toward the imperative treatment of the industrial wastewater containing 4-nitrophenol(4-NP)and industrial solid waste red mud(RM),an innovative approach of“Using waste to treat waste”is developed.Valuable element Al is leached from the RM first,the resultant NaAlO_(2) solution is hydrothermally converted toγ-AlOOH hierarchical porous microspheres(RMγ-AlOOH HPMSs,average diameter:2.0μm,SBET:77.81 m^(2) g^(-1),pore volume:0.38 cm^(3) g^(-1))in the presence of urea.The subsequent mild thermal conversion results inγ-Al_(2)O_(3) hierarchical porous microspheres(RMγ-Al_(2)O_(3) HPMSs).Both of the RMγ-AlOOH and RMγ-Al_(2)O_(3) HPMSs are employed as the Pd catalyst support for the catalytic reduction of 4-NP.Particularly,the as-obtained composite Pd/RMγ-AlOOH and Pd/RMγ-Al_(2)O_(3) exhibit excellent catalytic activities with superior knor as 8204.5 and 4831.4 s^(-1) g^(-1),respectively,significantly higher than that of most Pd based catalysts.Moreover,the excellent catalytic stability and durability of the Pd/RMγ-AlOOH and Pd/RMγ-Al_(2)O_(3) within 10 successive cycles of reduction enable the present industrial solid waste RM inducedγ-AlOOH andγ-Al_(2)O_(3) HPMSs as great promising Pd catalyst support for the reduction of the industrial wastewater containing 4-NP.
