Zinc telluride(ZnTe)with high density and low cost is considered as promising anode for sodium-ion batteries.However,ZnTe suffers from continuous capacity degradation owing to the low electronic conductivity,large vol...Zinc telluride(ZnTe)with high density and low cost is considered as promising anode for sodium-ion batteries.However,ZnTe suffers from continuous capacity degradation owing to the low electronic conductivity,large volume expansion,and high ion-diffusion energy barriers.Herein,the nitrogen-doped carbon confined ZnTe polyhedron heterostructure(ZnTe/NC)is proposed,exploiting its orbital rehybridization and the realignment of energy level to improve storage performance.Systematic ex situ/in situ characterizations and simulations demonstrated that the elaborate ZnTe/NC offers abundant electron/ion transport pathways,accelerates Na^(+)diffusion kinetics,and alleviates huge volume expansion.Notably,the nitrogen-doped carbon-support interaction induced via electron transfer between ZnTe sites and support elevates the energy level of Zn 3d orbital,greatly enhancing ion adsorption capability and reducing the ion diffusion barrier.As a result,the ZnTe/NC anode delivers a high discharge capacity of 470.5 mAh g^(−1)and long cycling durability over 1000 cycles.This work uncovers that optimizing sodium ion adsorption and diffusion via d-orbital energy level modulation enabled by nitrogen-doped support interaction is an effective method for developing high-performance transition metal telluride anodes for alkali ion storage.展开更多
基金supported by the National Natural Science Foundation of China(52402298,52172224,52302240)Science and Technology Correspondent Project of Tianjin(24YDTPJC00240)+1 种基金the Macao Young Scholars Program(AM2023011)the Yuanguang Scholars Program,Hebei University of Technology(282022554).
文摘Zinc telluride(ZnTe)with high density and low cost is considered as promising anode for sodium-ion batteries.However,ZnTe suffers from continuous capacity degradation owing to the low electronic conductivity,large volume expansion,and high ion-diffusion energy barriers.Herein,the nitrogen-doped carbon confined ZnTe polyhedron heterostructure(ZnTe/NC)is proposed,exploiting its orbital rehybridization and the realignment of energy level to improve storage performance.Systematic ex situ/in situ characterizations and simulations demonstrated that the elaborate ZnTe/NC offers abundant electron/ion transport pathways,accelerates Na^(+)diffusion kinetics,and alleviates huge volume expansion.Notably,the nitrogen-doped carbon-support interaction induced via electron transfer between ZnTe sites and support elevates the energy level of Zn 3d orbital,greatly enhancing ion adsorption capability and reducing the ion diffusion barrier.As a result,the ZnTe/NC anode delivers a high discharge capacity of 470.5 mAh g^(−1)and long cycling durability over 1000 cycles.This work uncovers that optimizing sodium ion adsorption and diffusion via d-orbital energy level modulation enabled by nitrogen-doped support interaction is an effective method for developing high-performance transition metal telluride anodes for alkali ion storage.
