Abstract
? 2022 Elsevier B.V.Self-supported nanoparticle electrocatalysts with multiple active sites and porosity have a bright prospect in the direction of oxygen evolution reaction (OER). In this work, a three-dimensional (3D) porous nanoparticle Fe-NiTe2/Ni2P is presented, which exhibits outstanding electrocatalytic activity and excellent stability. Specifically, the OER activity of Fe-NiTe2/Ni2P requires only 190 mV overpotential at the current density of 10 mA cm-2, which is the first time the overpotential of tellurides gets within 200 mV. It is because the rough porous 3D structure leads to a large number of exposed active sites, allowing enough channels to release oxygen and perform mass exchange. In addition, Fe doping can modulate the electronic structure of the catalyst, accelerate the electron transfer, and thus improve the activity of the catalyst. The catalyst remained stable in 1 M KOH solution for 22 h, indicating that it has strong corrosion resistance. In this work, a simple, efficient, low-cost and corrosion resistant iron-doped transition metal telluride electrocatalyst has been synthesized, which provides a valuable way for the study of water electrolysis.
NSTL
Elsevier