posted on 2023-12-12, 12:20authored byHaitao Xu, Ting Guo, Xiaoyun Lei, Shaobo Guo, Quan Liu, Jiufu Lu, Tianlei Zhang
The
design and synthesis of high-efficiency electrocatalysts
are
of great practical significance in electrocatalytic water splitting,
specifically in accelerating the slow oxygen evolution reaction (OER).
Herein, a self-supported bismuth-doped NiFe layered double hydroxide
(LDH) nanosheet array for water splitting was successfully constructed
on nickel foam by a one-step hydrothermal strategy. Benefiting from
the abundant active sites of two-dimensional nanosheets and electronic
effect of Bi-doped NiFe LDH, the optimal Bi0.2NiFe LDH
electrocatalyst exhibits excellent OER performance in basic media.
It only requires an overpotential of 255 mV to drive 50 mA cm–2 and a low Tafel slope of 57.49 mV dec–1. The calculation of density functional theory (DFT) further shows
that the incorporation of Bi into NiFe LDH could obviously overcome
the step of H2O adsorption during OER progress. This work
provides a simple and effective strategy for improving the electrocatalytic
performance of NiFe LDHs, which is of great practical significance.