Supercapacitors are indispensable for next-generation energy storage,achieving high energy density and long-term durability remains a formidable challenge.Conventional CoS suffers from poor conductivity,while Ti_(3)C_...Supercapacitors are indispensable for next-generation energy storage,achieving high energy density and long-term durability remains a formidable challenge.Conventional CoS suffers from poor conductivity,while Ti_(3)C_(2)faces severe restacking.Herein,we report a novel synthesis strategy that integrates metal-organic framework(MOF)growth with electrostatic self-assembly to construct heterojunction of CoS nanotubes coated with ultrathin Ti_(3)C_(2)nanofilms.Material characterization via SEM,TEM,XRD,and XPS systematically confirms the heterostructure formation,and chemical composition.This rational design synergistically leverages CoS high pseudocapacitance and Ti_(3)C_(2)metallic conductivity while the heterostructure mitigates restacking,enhances charge transfer,and stabilizes interfacial interactions.Density functional theory(DFT)calculations reveal strengthened OH-adsorption at the Co-Ti interface(E_(ad)=1.106 eV).Consequently,the CoS/Ti_(3)C_(2)@CC delivers a remarkable specific capacitance of 1034.21 F g^(-1) at 1 A g^(-1).Assembled into a supercapacitor,CoS/Ti_(3)C_(2)@CC//AC achieves a high energy density of 74.22 Wh kg^(-1) at 800 W kg^(-1),maintaining 89.13%initial capacitance after 10,000 cycles.Significantly,it exhibits a remarkably low leakage current(0.23μA)and ultra-prolonged voltage retention(47.14%after 120 h),underscoring exceptional durability.This work pioneers a rational heterostructure engineering strategy by integrating MOF-derived architectures with conductive MXene nanofilms,offering critical insights for the development of ultra-durable supercapacitors.展开更多
基金supported by the National Natural Science Foundation of China(22201107,52203147)Zhejiang Provincial Natural Science Foundation of China(MS25B040011)significant science and technology projects of LongMen Laboratory in Henan Province(231100220100).
文摘Supercapacitors are indispensable for next-generation energy storage,achieving high energy density and long-term durability remains a formidable challenge.Conventional CoS suffers from poor conductivity,while Ti_(3)C_(2)faces severe restacking.Herein,we report a novel synthesis strategy that integrates metal-organic framework(MOF)growth with electrostatic self-assembly to construct heterojunction of CoS nanotubes coated with ultrathin Ti_(3)C_(2)nanofilms.Material characterization via SEM,TEM,XRD,and XPS systematically confirms the heterostructure formation,and chemical composition.This rational design synergistically leverages CoS high pseudocapacitance and Ti_(3)C_(2)metallic conductivity while the heterostructure mitigates restacking,enhances charge transfer,and stabilizes interfacial interactions.Density functional theory(DFT)calculations reveal strengthened OH-adsorption at the Co-Ti interface(E_(ad)=1.106 eV).Consequently,the CoS/Ti_(3)C_(2)@CC delivers a remarkable specific capacitance of 1034.21 F g^(-1) at 1 A g^(-1).Assembled into a supercapacitor,CoS/Ti_(3)C_(2)@CC//AC achieves a high energy density of 74.22 Wh kg^(-1) at 800 W kg^(-1),maintaining 89.13%initial capacitance after 10,000 cycles.Significantly,it exhibits a remarkably low leakage current(0.23μA)and ultra-prolonged voltage retention(47.14%after 120 h),underscoring exceptional durability.This work pioneers a rational heterostructure engineering strategy by integrating MOF-derived architectures with conductive MXene nanofilms,offering critical insights for the development of ultra-durable supercapacitors.
