超精细过渡金属氧化物(TMO)在储锂方面具有巨大潜力,但在实际应用中还存在易团聚、电导率低等挑战。本文采用双炭复合方法,首先将ZIFs-67固定于模板法制备的石油沥青基多孔炭骨架上,然后将配位Co2+原位转化为CoMoO4@炭纳米颗粒,生成CoMo...超精细过渡金属氧化物(TMO)在储锂方面具有巨大潜力,但在实际应用中还存在易团聚、电导率低等挑战。本文采用双炭复合方法,首先将ZIFs-67固定于模板法制备的石油沥青基多孔炭骨架上,然后将配位Co2+原位转化为CoMoO4@炭纳米颗粒,生成CoMoO4@炭纳米颗粒/多孔炭骨架(CoMoO4@CP/CF)。通过ZIFs-67热解制备出N掺杂炭骨架,从本质上提高CoMoO4电子传输能力,而超细炭纳米颗粒可以有效阻止CoMoO4聚集。基于上述优点,将该复合材料用做锂离子电池负极,电流密度为1 A g-1时,可提供高达818 mAh g-1的可逆比容量。该合成方法为高性能储能电极材料的设计提供了新途径。展开更多
Cobalt molybdate/non-stoichiometric cobalt sulfide（CoMoO4/Co1-xS） hybrid was in situ grown on nickel foam by a simple two-step hydrothermal process. The as-prepared CoMoO4/Co1-xS hybrid electrode possessed core-shel...Cobalt molybdate/non-stoichiometric cobalt sulfide（CoMoO4/Co1-xS） hybrid was in situ grown on nickel foam by a simple two-step hydrothermal process. The as-prepared CoMoO4/Co1-xS hybrid electrode possessed core-shell nanostructure, large surface area and high specific capacitance of 2250 F g-1 at a current density of 1 A g-1. Using the hybrid as anode and activated carbon（AC） as cathode, an asymmetric supercapacitor of CoMoO4/Co1-xS//AC was fabricated. The optimized supercapacitor had large potential window of 1.6 V and high capacitance of 112 F g-1, resulting in high power density of 804.5 W kg-1 and energy density of 39.8 Wh kg-1. Furthermore, the supercapacitor exhibited an excellent long cycle life along with 86.4% specific capacitance retained after 5000 cycles. The superior performances and good stability of the asymmetric supercapacitor can be attributed to the unique structure of the two components in hybrid, and the positive synergistic effects of the hybrid electrodes. The facile preparation process and excellent performance presented here render the CoMoO4/Co1-xS hybrid as a promising candidate for energy storage device.展开更多
Heteroatom incorporation into the lattice of host materials as bifunctional electrocatalysts is developed as an effective strategy to promote electrochemical water splitting but challenges remain in the modulation of ...Heteroatom incorporation into the lattice of host materials as bifunctional electrocatalysts is developed as an effective strategy to promote electrochemical water splitting but challenges remain in the modulation of catalytic activity.Herein,Te-doped CoMoO_(3)supported on a carbon matrix(Te-CoMoO_(3)@C)is synthesized by lattice engineering with filter paper as a sacrificial carrier and carbon source.展开更多
文摘超精细过渡金属氧化物(TMO)在储锂方面具有巨大潜力,但在实际应用中还存在易团聚、电导率低等挑战。本文采用双炭复合方法,首先将ZIFs-67固定于模板法制备的石油沥青基多孔炭骨架上,然后将配位Co2+原位转化为CoMoO4@炭纳米颗粒,生成CoMoO4@炭纳米颗粒/多孔炭骨架(CoMoO4@CP/CF)。通过ZIFs-67热解制备出N掺杂炭骨架,从本质上提高CoMoO4电子传输能力,而超细炭纳米颗粒可以有效阻止CoMoO4聚集。基于上述优点,将该复合材料用做锂离子电池负极,电流密度为1 A g-1时,可提供高达818 mAh g-1的可逆比容量。该合成方法为高性能储能电极材料的设计提供了新途径。
基金financial joint support by the National Natural Science Foundation of China (nos. 91422301, 51472094, 61474047)
文摘Cobalt molybdate/non-stoichiometric cobalt sulfide（CoMoO4/Co1-xS） hybrid was in situ grown on nickel foam by a simple two-step hydrothermal process. The as-prepared CoMoO4/Co1-xS hybrid electrode possessed core-shell nanostructure, large surface area and high specific capacitance of 2250 F g-1 at a current density of 1 A g-1. Using the hybrid as anode and activated carbon（AC） as cathode, an asymmetric supercapacitor of CoMoO4/Co1-xS//AC was fabricated. The optimized supercapacitor had large potential window of 1.6 V and high capacitance of 112 F g-1, resulting in high power density of 804.5 W kg-1 and energy density of 39.8 Wh kg-1. Furthermore, the supercapacitor exhibited an excellent long cycle life along with 86.4% specific capacitance retained after 5000 cycles. The superior performances and good stability of the asymmetric supercapacitor can be attributed to the unique structure of the two components in hybrid, and the positive synergistic effects of the hybrid electrodes. The facile preparation process and excellent performance presented here render the CoMoO4/Co1-xS hybrid as a promising candidate for energy storage device.
基金supported by the National Natural Science Foundation of China(22101132,51901100,22075141,51871119 and 21978111)the Science and Technology Projects of Suzhou City(SYG202025)+3 种基金Jiangsu Provincial Foundation for the Natural Science Foundation(BK20210311)China Postdoctoral Science Foundation(2021M691561 and 2021T140319)Postgraduate Research&Practice Innovation Program of NUAA(xcxjh20210607)Jiangsu Postdoctoral Research Fund(2021K547C).
文摘Heteroatom incorporation into the lattice of host materials as bifunctional electrocatalysts is developed as an effective strategy to promote electrochemical water splitting but challenges remain in the modulation of catalytic activity.Herein,Te-doped CoMoO_(3)supported on a carbon matrix(Te-CoMoO_(3)@C)is synthesized by lattice engineering with filter paper as a sacrificial carrier and carbon source.
