WS_(2),a two-dimensional layered material,is promising as sodium-ion batteries(SIBs)anode due to its large lnterlamellar spacing and high sodium storage capacity.However,its low electronic conductivity and high Na^(+)...WS_(2),a two-dimensional layered material,is promising as sodium-ion batteries(SIBs)anode due to its large lnterlamellar spacing and high sodium storage capacity.However,its low electronic conductivity and high Na^(+)adsorption energy hinder reaction kinetics.Here we demonstrate that substituting Se for part of the S in WS_(2)reduces interlayer Na^(+)adsorption and increases electronic conductivity.Based on this finding,lamellar WSSe,grown in situ on peanut shell-derived carbon(PSDC/WSSe),is elaborately designed as a highly stable SIB anode with a fast kinetic.PSDC/WSSe with carbon matrix and Se substitution simultaneously provides fast electron transport channels and lowered Na^(+)transport barriers(0.22 eV).The PSDC/WSSe anode offers a considerable reversible sodium storage capacity(288.0 mAh g^(-1)after 1000 cycles at 1.0 A g^(-1))and a fast kinetic reaction.A SIB full-cell using a PSDC/WSSe anode and Na_(3)V_(2)(PO_(4))_(3)cathode achieves a 215.4 Wh kg^(-1)high energy density,and successfully powers LEDs.This work offers new strategies to lower sodium ion transportation barrier in two-dimensional layered materials.展开更多
基金financially supported by the Key R&D Plan of Shaanxi Province(Grant No.2023-YBGY-492)financial support from the Australian Research Councilthe QUT Capacity Building Professor Program。
文摘WS_(2),a two-dimensional layered material,is promising as sodium-ion batteries(SIBs)anode due to its large lnterlamellar spacing and high sodium storage capacity.However,its low electronic conductivity and high Na^(+)adsorption energy hinder reaction kinetics.Here we demonstrate that substituting Se for part of the S in WS_(2)reduces interlayer Na^(+)adsorption and increases electronic conductivity.Based on this finding,lamellar WSSe,grown in situ on peanut shell-derived carbon(PSDC/WSSe),is elaborately designed as a highly stable SIB anode with a fast kinetic.PSDC/WSSe with carbon matrix and Se substitution simultaneously provides fast electron transport channels and lowered Na^(+)transport barriers(0.22 eV).The PSDC/WSSe anode offers a considerable reversible sodium storage capacity(288.0 mAh g^(-1)after 1000 cycles at 1.0 A g^(-1))and a fast kinetic reaction.A SIB full-cell using a PSDC/WSSe anode and Na_(3)V_(2)(PO_(4))_(3)cathode achieves a 215.4 Wh kg^(-1)high energy density,and successfully powers LEDs.This work offers new strategies to lower sodium ion transportation barrier in two-dimensional layered materials.
