The effects of Al substitution and partial dissolution on ultrathin NiFeAl trinary layered double hydroxide nanosheets for oxygen evolution reaction in alkaline solution

Journal Article (Journal Article)

Recently, Ni–based layered double hydroxide (LDH) materials have attracted growing interest owing to the remarkable performance for oxygen evolution reaction (OER). Here we demonstrate the preparation of ultrathin Ni FeAl trinary LDH nanosheets with higher activity and stability than NiFe–LDH nanosheets for OER. The enhancement was derived from Al substitution, which increased the concentration of Ni active sites on the catalyst surface. Besides, low-coordinated Ni and Fe atoms and defects were formed by partial etching/dissolution of Al in alkaline solution, which further increased the activity towards OER. To improve the conductivity, Ni FeAl –LDH (x=0, 0.91, 1.27 or 2.73) nanosheets were also in-situ grown on three-dimensional-networked nickel foam. The binder-free Ni FeAl –LDH/Ni foam electrodes exhibited further improved catalytic performance compared to the electrodes made of powdery Ni FeAl –LDHs and nafion binder. The best OER performance was presented by Ni FeAl –LDH/Ni foam, showing a Tafel slope of 57 mV/dec, a low overpotential (304 mV) at the current density of 20 mA/cm , and a current density of 235 mA/cm at 1.60 V (vs. RHE). Furthermore, the Ni FeAl –LDHs/Ni foam electrode showed excellent long-term stability, maintaining a stable overpotential of 320 mV at 20 mA/cm after testing for 18 h. 3 x 3 x 3 x 3 x 3 0.91 3 0.91 3+ 3+ 2 2 2

Full Text

Duke Authors

Cited Authors

  • Liu, H; Wang, Y; Lu, X; Hu, Y; Zhu, G; Chen, R; Ma, L; Zhu, H; Tie, Z; Liu, J; Jin, Z

Published Date

  • May 1, 2017

Published In

Volume / Issue

  • 35 /

Start / End Page

  • 350 - 357

International Standard Serial Number (ISSN)

  • 2211-2855

Digital Object Identifier (DOI)

  • 10.1016/j.nanoen.2017.04.011

Citation Source

  • Scopus