Co3O4 nanowire@ultrathin Ni-Co layered double hydroxide core-shell arrays with vertical transfer channel for high-performance supercapacitor

Authors：Han, Dandan^*; Zhao, Yuan; Shen, Ye; Wei, Yen^*; Mao, Liucheng; Zeng, Guangjian

Source：Journal of Electroanalytical Chemistry, 2020, 859: 113887.

DOI：10.1016/j.jelechem.2020.113887

• Core/shell heterostructure
• Co3O4
• Ni-Co LDH
• Supercapacitor

High electrochemical performance of supercapacitor electrodes largely rely on the heterostructure of different active component materials. Furthermore, the integration of Co3O4 nanowire (internal conductive highway) to bridge the Ni-Co layered double hydroxides nanosheets (provided high specific capacity), which is favorable for fast charge transfer, as well as improved conductivity. Thus, the Co3O4@Ni-Co LDH core-shell nanowire arrays electrodes exhibit a remarkable specific capacitance (1318 F.g(-1) at 0.5 A.g(-1)) and also a relatively low resistance. Due to synergistic interaction of porous NiCo-LDH nanosheets and inner Co3O4 nanowire, an asymmetric supercapacitor (ASC) is assembled with Co3O4@Ni-Co LDH as the anode and active carbon as cathode. The as-fabricated ASC shows high energy density of 46.3 Wh.kg(-1) and exhibit superior cyclic stability of 92% retention after 5000 cycles, suggesting this electrode is promising for efficient electrochemical capacitors.

• Institution
  清华大学; y