• 文献标题:   Electrostatic adsorbing graphene quantum dot into nickel-based layered double hydroxides: Electron absorption/donor effects enhanced oxygen electrocatalytic activity
  • 文献类型:   Article
  • 作  者:   GUO XL, ZHENG XQ, HU XL, ZHAO QN, LI L, YU P, JING C, ZHANG YX, HUANG GS, JIANG B, XU CH, PAN FS
  • 作者关键词:   grapheme quantum dot, layered double hydroxide, electronic structure, electrocatalyst, znair batterie
  • 出版物名称:   NANO ENERGY
  • ISSN:   2211-2855 EI 2211-3282
  • 通讯作者地址:  
  • 被引频次:   48
  • DOI:   10.1016/j.nanoen.2021.105932 EA MAR 2021
  • 出版年:   2021

▎ 摘  要

Exploring electrocatalysts with optimal electronic structure and understanding the relationship between electronic structure and activity are highly required for designing advanced OER catalysts. Recently, introducing nanocarbon materials into LDHs has been demonstrated as an effective way to improve the OER activity; however, deeply understanding the regulating effect of nanocarbon on the electronic structure of LDHs is still a critical challenge. Herein, it is reported that the regulating of the surface electronic structure of nickel-based layered double hydroxides (NiM-LDHs (M = Fe, Co, Mn)) by adsorbing graphene quantum dot (GQDs). The Ni-based LDHs/GQDs delivers enhanced OER activity, and particularly NiFe LDH/GQDs achieves an ultralow overpotential of 189 mV (10 mA cm-2) and superior performance in rechargeable Zn-air battery tests. Combining with theoretical calculations and X-ray photoelectron spectroscopy, we ascribe the excellent OER activity of Ni-based LDHs/GQDs to the strong interaction between NiFe LDH and GQDs, which changes the charge distribution around metal ions and triggers the charge accumulation of the active Ni species. The above results demonstrate the significance of controlling the surface electronic structure for designing advanced 3d metal electrocatalysts.