Tailoring surface and interface electronic structure of NiFe LDH via V doping for enhanced oxygen evolution reaction

The NiFe layered double hydroxide (LDH) with lamellar structure is beneficial to exposure more active sites. It shows high OER catalytic activity and stability under alkaline conditions, which makes it one of the hot spots in OER catalysts. The intrinsic electrocatalytic activity of the NiFe LDH can be further improved via doping to tailor surface electronic structure and valence state. The NiFe-Vx catalysts were prepared by onestep hydrothermal method. Compared with that of undoped NiFe LDH, the oxygen evolution overpotential of NiFe-V1.0 was reduced by 37 mV at a current density of 10 mA cm-2, the Tafel slope is decreased by 43.37 mV dec-1. The results demonstrated that V doping can enhance the electron transfer of LDH, and increase the electrochemical active surface area, leading to the enhanced OER activity. (c) 2021 Published by Elsevier B.V.