2D/2D core/shell structure of FeCo2O4@NiMn LDH for efficient oxygen evolution reaction

Developing high-performance non-precious metal electrocatalysts for oxygen evolution reaction (OER) is of great significance to the production of green hydrogen fuel. In this work, ultrathin NiMn LDH nanosheets are grown on FeCo2O4 nanoflakes to form a 2D/2D core/shell structure on nickel foam (NF) as an effective catalyst for OER. Owning to the well-designed core/shell heterostructure, large electrochemical active surface area, high electron conductivity, rapid mass/charge transfer, and as well as synergistic effect be-tween FeCo2O4 and NiMn LDH, the core/shell FeCo2O4 @NiMn LDH/NF electrode displays a small Tafel slope of 31.85 mV dec-1 and exhibits a rather low overpotential of 232 mV to deliver the current density of 10 mA cm-2 for OER process, while maintaining good stability for 24 h in alkaline electrolyte. These results demonstrate that FeCo2O4 @NiMn LDH is a promising material for OER.(c) 2022 Elsevier B.V. All rights reserved.

Automated summary

Developing high-performance non-precious metal electrocatalysts for the oxygen evolution reaction (OER), particularly for the production of green hydrogen fuel, is highly significant. In this study, ultrathin NiMn LDH nanosheets were grown on FeCo2O4 nanoflakes to form a 2D/2D core/shell structure on a nickel foam (NF) as an effective catalyst for OER. The FeCo2O4 @NiMn LDH/NF electrode exhibited desirable characteristics, such as a small Tafel slope, low overpotential, and good stability, indicating its potential as a promising material for OER.