“…13–15 However, these noble metal catalysts cannot be employed for large-scale commercial applications because of their limited multifunctional performance, 8 high price, small earth reserves, and poor stability. 16,17 The 3d transition metal-based catalysts, such as layered double hydroxides (LDHs), 18 metal oxides (hydroxides), 19,20 phosphides, 21,22 sulfides, 23 selenides, 24 nitrides, 25 metal phosphates, 26 and carbides, 27 have the characteristics of abundant reserves, low cost, and high efficiency, and they have been widely used in electrocatalytic water splitting research and are potential candidates for the electrocatalytic OER. 26…”