Abstract
AbstractScalable synthesis of non‐noble‐metal‐based electrocatalysts achieved by energy‐saving and cost‐effective strategies towards efficient oxygen evolution is primary significant for the practical application of water splitting, however, it is still a great challenge. In this work, a two‐step corrosion engineering is proposed to construct ultrathin NiFe‐LDH and high‐conductivity Ni9S8 composites (denoted as NiFe‐LDH/Ni9S8/NF) at room temperature. By ingeniously using the corrosion reaction between nickel foam (NF) and S2O32− under acidic condition, Ni9S8 was firstly formed on the surface of Ni foam. Then, ultrathin NiFe‐LDH nanosheets were precipitated on the Ni9S8 surface through an ultrafast Fe2+ ions‐assisted corrosion treatment. Featured with fast electron/mass transfer rates, sheet‐stacked structure, and superior hydrophilicity, NiFe‐LDH/Ni9S8/NF exhibits an enhanced oxygen evolution reaction (OER) activity with low overpotentials of 223 and 265 mV at 10 and 100 mA cm−2, respectively. Such feasible, economical, and scale‐up synthesis method might open a new avenue for the wide‐scale fabrication of materials for various electrochemical applications.
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