Aqueous zinc metal batteries(ZMBs)are regarded as strong contenders in secondary battery systems due to their high safety and abundant resources.However,the cycling performance of the Zn anode and the overall performa...Aqueous zinc metal batteries(ZMBs)are regarded as strong contenders in secondary battery systems due to their high safety and abundant resources.However,the cycling performance of the Zn anode and the overall performance of the cells have often been hindered by the formation of Zn dendrites and the occurrence of parasitic side reactions.In this paper,a surface electron reconfiguration strategy is proposed to optimize the adsorption energy and migration energy of Zn^(2+)for a better Zn^(2+)deposition/stripping process by adjusting the electronic structure of ceric dioxide(CeO_(2))artificial interface layer with copper atoms(Cu)doped.Both experimental results and theoretical calculations demonstrate that the Cu_(2)Ce_(7)Ox interface facilitates rapid transport of Zn^(2+)due to the optimized electronic structure and appropriate electron density,leading to a highly reversible and stable Zn anode.Consequently,the Cu_(2)Ce_(7)Ox@Zn symmetric cell exhibits an overpotential of only 24 mV after stable cycling for over 1600 h at a current density of 1 mA/cm^(2)and a capacity of 1 mAh/cm^(2).Additionally,the cycle life of Cu/Zn asymmetric cells exceeds 2500 h,with an average Coulombic efficiency of 99.9%.This paper provides a novel approach to the artificial interface layer strategy,offering new insights for improving the performance of ZMBs.展开更多
基金supported by the Fujian Province Super 100 Talents Programthe Pilot Group Program of the Research Fund for International Senior Scientists(No.22250710676)+2 种基金the National Natural Science Foundation of China(Grant No.22409029)the Fuzhou University Testing Fund of Precious Apparatus(Nos.2024T004 and 2024T005)the Scientific Research Fund for Fuzhou University(Nos.511336 and 511346).
文摘Aqueous zinc metal batteries(ZMBs)are regarded as strong contenders in secondary battery systems due to their high safety and abundant resources.However,the cycling performance of the Zn anode and the overall performance of the cells have often been hindered by the formation of Zn dendrites and the occurrence of parasitic side reactions.In this paper,a surface electron reconfiguration strategy is proposed to optimize the adsorption energy and migration energy of Zn^(2+)for a better Zn^(2+)deposition/stripping process by adjusting the electronic structure of ceric dioxide(CeO_(2))artificial interface layer with copper atoms(Cu)doped.Both experimental results and theoretical calculations demonstrate that the Cu_(2)Ce_(7)Ox interface facilitates rapid transport of Zn^(2+)due to the optimized electronic structure and appropriate electron density,leading to a highly reversible and stable Zn anode.Consequently,the Cu_(2)Ce_(7)Ox@Zn symmetric cell exhibits an overpotential of only 24 mV after stable cycling for over 1600 h at a current density of 1 mA/cm^(2)and a capacity of 1 mAh/cm^(2).Additionally,the cycle life of Cu/Zn asymmetric cells exceeds 2500 h,with an average Coulombic efficiency of 99.9%.This paper provides a novel approach to the artificial interface layer strategy,offering new insights for improving the performance of ZMBs.
