Mn‐Doped Cactus‐Shaped Co ₂ P Was Used as an Efficient Overall Water Decomposition Electrocatalyst

We successfully engineered a cactus‐like Co 2 P nanocatalyst for overall water splitting by incorporating manganese to modulate its electronic structure. Incorporating Mn into Co 2 P enhances both HER and OER through optimized surface adsorption, leading to faster kinetics and improved catalytic efficiency. The Mn‐Co 2 P catalyst delivers outstanding alkaline HER performance, requiring just 51 mV to drive 10 mA cm −2 while showing no degradation during a 48‐h stability test. Notably, the OER overpotential is just 283 mV at 50 mA cm −2 with remarkable durability. Remarkably, when utilized as dual‐function electrodes in a complete water electrolysis system, the Mn‐Co 2 P‐based system delivers 10 mA cm −2 at a low cell voltage of 1.523 V, along with brilliant long‐term stability.