“…However, their low reserves and high cost limit the practical application in hydrogen production technology. Thus, in recent years, lots of research work has been devoted to the OER catalytic activity based on non‐noble metal elements (such as NiO x @MnO x , [4] FeCoW oxides, [5] MoS 2 /Ni 3 S 2 , [6] NiFeN x , [7] CuCo 2 N x , [8] CoMP x NRs [9] ). These strategies include controlling the morphology of the catalyst, mixing the main active sites with other auxiliary active sites, using large surface area catalyst supports, etc.…”