Though water splitting is at present probably the most promising expertise for making ready inexperienced hydrogen on a big scale, the excessive power consumption has restricted its industrial utility. The sluggishness of the oxygen evolution response (OER) on the anode hinders the electrolysis effectivity of water splitting. Thus, the preparation of a high-performance OER catalyst is the important thing to the electrolysis course of. The cobalt phosphate (CoPi) based mostly materials has attracted nice consideration because of its low value, abundance, good stability, excessive catalytic exercise, and redox properties. This evaluate goals to supply an outline of current advances in CoPi, together with the construction composition, synthesis strategies, and materials efficiency tuning. The response mechanisms are summarized and elucidated to grasp the OER conduct of CoPi. As well as, the challenges and prospects for CoPi are proposed.