FeOOH-NiV LDH Heterostructure as Efficient Electrocatalyst for Oxygen Evolution Reaction

The oxygen evolution reaction (OER) with complex 4-electron transfer is a critical issue limiting the efficiency of electrolytic hydrogen production. Therefore, to develop efficient OER electrocatalysts for water splitting was necessary. Given the abundant unoccupied 3d orbitals of high-valent vanadium ions and the three-dimensional structure of nickel foam substrates, this study successfully fabricate hydroxy-iron oxide (FeOOH) modified nickel vanadium layered double hydroxide (NiV LDH) nanosheets array heterostructure electrocatalysts through surface modification method. By coupling FeOOH with NiV LDH, the electron structure between Fe, Ni, V, and O was finely regulated. Thanks to the strong electronic interactions at the heterostructure interface, the prepared heterostructure electrocatalysts exhibit outstanding electrocatalytic OER performance in 1 M KOH electrolyte. The heterostructure electrocatalyst demonstrated overpotentials of only 212, 252, and 279 mV at current densities of 10, 50, and 100 mA<middle dot>cm-2, respectively, and a Tafel slope of only 71.37 mV<middle dot>dec-1. This study provided a new strategy for developing efficient new OER heterostructure catalysts.