Multimetallic systems, such as bimetallic systems have better electronic conductivity than monometallic catalysts. First-row transition metal-based trimetallic oxide-hydroxide electrocatalysts have shown advanced catalytic properties when compared to mono-and bimetallic-based catalysts. For instance, Nanda et al. reported porous nanosheets composed of cobalt, nickel and manganese oxide-hydroxide that manifest higher catalytic activity than bimetallic systems (Ni-Mn, Co-Mn or Co-Ni). This trimetallic nanosheet showed 0% loss of current density after 8000 cycles and performed better than commercially available RuO2 catalysts in terms of durability and catalytic activity.