Ultrahigh density defects of Mn₃O₄ boosting oxygen evolution reaction

Surface defects have a positive effect on the improvement of electrocatalytic performance due to ability introduce half-metallicity into selected semiconductors. Herein, we prepare defect-rich Ni-doped Mn3O4 (Ni-Mn3O4) material by simple hydrothermal and impregnation method. Ni-Mn3O4 exhibits unique morphology consisting ultrathin nanoarrays nanoflowers embellished at top, which endows with large specific surface area reactive sites contributes enhanced oxygen evolution reaction (OER). The obtained shows improved OER activity overpotential 290 mV current density 20 mA cm -2 . This remarkable can be attributed multi-dimensional interface ultra-high defects, leading formation abundant active sites, thereby inducing properties suitable intermediate adsorption energies. work is expected provide reference guidance for design synthesis high-performance electrocatalysts.