Molybdenum disulfide(MoS_(2))has drawn considerable attention in energy storage due to its layered structures,large specific surface area,and abundant edges.However,poor conductivity and inert basal planes limit the c...Molybdenum disulfide(MoS_(2))has drawn considerable attention in energy storage due to its layered structures,large specific surface area,and abundant edges.However,poor conductivity and inert basal planes limit the charge transfer and active sites of 2H-MoS_(2),and the metastable phase compromises the long-term stability of 1T-MoS_(2).Herein,MoS_((1-2x))Te_(2x)/carbonized cellulose nanofiber(CCNF)aerogels are prepared through in-situ tellurization-carbonization,where CCNF acts as an excellent dispersant to suppress the restacking of MoS_((1-2x))Te_(2x)nanosheets,thereby providing a porous conductive network that facilitates ion transport.Meanwhile,Te doping introduces defects into the basal plane,thereby improving the electrochemical activity.As-prepared MoS_((1-2x))Te_(2x)/CCNF aerogels exhibit outstanding supercapacitor performance with a massive specific capacitance of 1396 F g^(-1)at 1 Ag^(-1)and an exceptional cyclic retention rate of 91.76%after 5000 cycles.Besides,an asymmetric supercapacitor integrated with a MoS_((1-2x))Te_(2x)/CCNF positive electrode and a MoO_(3)/CCNF negative electrode exhibits a wide working window of 1.2 V,a massive energy density of 38.52 Wh kg^(-1),and a high power density of 592.6 W kg^(-1).This work not only addresses the core challenges associated with 2D transition metal chalcogenides but also leverages a renewable carbon source,paving the way for developing scalable,high-performance,and environmentally friendly supercapacitors.展开更多
基金supported by the Natural Science Foundation of Fujian Province(Grant No.2023J01524)the Joint Project for Talent Innovation Sharing Alliance of Quanzhou(Grant No.2022C001L)。
文摘Molybdenum disulfide(MoS_(2))has drawn considerable attention in energy storage due to its layered structures,large specific surface area,and abundant edges.However,poor conductivity and inert basal planes limit the charge transfer and active sites of 2H-MoS_(2),and the metastable phase compromises the long-term stability of 1T-MoS_(2).Herein,MoS_((1-2x))Te_(2x)/carbonized cellulose nanofiber(CCNF)aerogels are prepared through in-situ tellurization-carbonization,where CCNF acts as an excellent dispersant to suppress the restacking of MoS_((1-2x))Te_(2x)nanosheets,thereby providing a porous conductive network that facilitates ion transport.Meanwhile,Te doping introduces defects into the basal plane,thereby improving the electrochemical activity.As-prepared MoS_((1-2x))Te_(2x)/CCNF aerogels exhibit outstanding supercapacitor performance with a massive specific capacitance of 1396 F g^(-1)at 1 Ag^(-1)and an exceptional cyclic retention rate of 91.76%after 5000 cycles.Besides,an asymmetric supercapacitor integrated with a MoS_((1-2x))Te_(2x)/CCNF positive electrode and a MoO_(3)/CCNF negative electrode exhibits a wide working window of 1.2 V,a massive energy density of 38.52 Wh kg^(-1),and a high power density of 592.6 W kg^(-1).This work not only addresses the core challenges associated with 2D transition metal chalcogenides but also leverages a renewable carbon source,paving the way for developing scalable,high-performance,and environmentally friendly supercapacitors.
