MXenes are emerging rapidly as promising electrode materials for energy storage due to their high electronic conductivity and rich surface chemistry,but their potassium storage performance is unsatisfactory because of...MXenes are emerging rapidly as promising electrode materials for energy storage due to their high electronic conductivity and rich surface chemistry,but their potassium storage performance is unsatisfactory because of the large size of K^(+)and irreversible interfacial reaction.Here,a developed 3D foam-like MXene scaffold(3D-FMS)is constructed via an electrostatic neutralization of Ti_(3)C_(2)T_(x)with positive-charged melamine followed with calcination,which offers massive surface-active sites and facilitates fast K^(+)transfer for boosting the potassium-ion storage capacity and dynamics.In addition,using KFSI-based electrolyte,the formation of a robust solid electrolyte interface layer with more inorganic components on MXene anode is revealed for enhancing the Coulombic efficiency.Consequently,the 3DFMS with KFSI-based electrolyte delivers enhanced potassium-ion storage performance in terms of capacity(161.4 mAh g^(-1)at 30 mA g^(-1)),rate capability(70 mAh g^(-1)at 2 A g^(-1)),and cycling stability(80.5 mAh g^(-1)at 1 A g^(-1)after 2000 cycles).Moreover,the assembled 3D-FMS//activated carbon potassium-ion hybrid supercapacitor delivers a high energy density of 57 Wh kg^(-1)at a power density of 290 W kg^(-1).These excellent performances demonstrate the great superiority of 3D-FMS in KFSI-based electrolyte and may accelerate the development of MXene-based materials for potassium storage systems.展开更多
采用氧化镁烟气脱硫固废制备了类水滑石(HTLcs)。通过氧指数仪、锥形量热仪研究了类水滑石对聚氨酯硬泡(RPUF)/聚磷酸铵(APP)阻燃体系的阻燃和抑烟性能的影响。研究表明,当聚磷酸铵用量为40%、HTLcs用量为10%时,聚氨酯硬泡的极限氧指数(...采用氧化镁烟气脱硫固废制备了类水滑石(HTLcs)。通过氧指数仪、锥形量热仪研究了类水滑石对聚氨酯硬泡(RPUF)/聚磷酸铵(APP)阻燃体系的阻燃和抑烟性能的影响。研究表明,当聚磷酸铵用量为40%、HTLcs用量为10%时,聚氨酯硬泡的极限氧指数(LOI)达到了34.2%,其最大热释放速率(PHRR)由RPUF的140 k W/m^2降低到85 k W/m^2,减幅达39.3%,且最大烟释放速率(PSRR)低于0.25 m^2/s。类水滑石与APP具备一定的协效阻燃和抑烟性能。展开更多
基金the financial support by the National Natural Science Foundation of China(Grant No.U2004212 and 51802012)China Postdoctoral Science Foundation(2021M690315)
文摘MXenes are emerging rapidly as promising electrode materials for energy storage due to their high electronic conductivity and rich surface chemistry,but their potassium storage performance is unsatisfactory because of the large size of K^(+)and irreversible interfacial reaction.Here,a developed 3D foam-like MXene scaffold(3D-FMS)is constructed via an electrostatic neutralization of Ti_(3)C_(2)T_(x)with positive-charged melamine followed with calcination,which offers massive surface-active sites and facilitates fast K^(+)transfer for boosting the potassium-ion storage capacity and dynamics.In addition,using KFSI-based electrolyte,the formation of a robust solid electrolyte interface layer with more inorganic components on MXene anode is revealed for enhancing the Coulombic efficiency.Consequently,the 3DFMS with KFSI-based electrolyte delivers enhanced potassium-ion storage performance in terms of capacity(161.4 mAh g^(-1)at 30 mA g^(-1)),rate capability(70 mAh g^(-1)at 2 A g^(-1)),and cycling stability(80.5 mAh g^(-1)at 1 A g^(-1)after 2000 cycles).Moreover,the assembled 3D-FMS//activated carbon potassium-ion hybrid supercapacitor delivers a high energy density of 57 Wh kg^(-1)at a power density of 290 W kg^(-1).These excellent performances demonstrate the great superiority of 3D-FMS in KFSI-based electrolyte and may accelerate the development of MXene-based materials for potassium storage systems.
文摘采用氧化镁烟气脱硫固废制备了类水滑石(HTLcs)。通过氧指数仪、锥形量热仪研究了类水滑石对聚氨酯硬泡(RPUF)/聚磷酸铵(APP)阻燃体系的阻燃和抑烟性能的影响。研究表明,当聚磷酸铵用量为40%、HTLcs用量为10%时,聚氨酯硬泡的极限氧指数(LOI)达到了34.2%,其最大热释放速率(PHRR)由RPUF的140 k W/m^2降低到85 k W/m^2,减幅达39.3%,且最大烟释放速率(PSRR)低于0.25 m^2/s。类水滑石与APP具备一定的协效阻燃和抑烟性能。
