In-Situ Formed Frame Structure High Entropy Alloy with Formation of Feconimgooh Lath Structure Array During Reactions for Efficient Oxygen Evolution Reaction

Abstract

The design of innovative method for catalytic nanomaterials is crucial to the realization of environmental conversion and storage technologies. In this study, a frame structure FeCoNiMgB/NF high entropy boride alloy is fabricated by a new via in-situ grown high entropy alloy powder on nickel foam (NF). The as-prepared a frame structure FeCoNiMgB/NF high entropy boride alloy presents more excellent OER electrocatalytic performance than pure FeCoNiMgB powder or other counterparts, and exhibits 183 mV low overpotential at a current density of 10 mA cm−2 and 34 mV dec−1 Tafel slope in 1 M KOH, as well as excellent stability without excessive decay within 72 h. The excellent catalytic performances of frame structure FeCoNiMgB/NF high entropy alloy mainly benefit from synergistic effect of FeCoNiMgB-NF, larger specific surface area and excellent frame structure conductivity. The ultrao-long stability of FeCoNiMgB/NF comes from the progressive formation of FeCoNiMgOOH lath structure array in the reaction process that allowable low adsorption energy and charge-transfer energy are calculated theoretically. This work provides a new method for constructing advanced frame structure high entropy boride alloy for energy conversion and storage technologies.

Keywords: Keywords: Frame structure electrocatalyst, Water splitting, Oxygen evolution reaction, FeCoNiMgOOH lath structure array