Hydrogen, as an alternative to fossil fuels, is gaining attention for its potential to address energy and environmental challenges. Water splitting for green hydrogen production is a promising strategy, but efficient oxygen evolution reaction (OER) catalysts are crucial. Scientists are focusing on transition metal-based catalysts that offer cost-effective alternatives to noble metals. Strategies like heterointerface construction and nanostructuring have been successful in enhancing OER performance. Metal organic framework (MOF)-derived materials are also explored for their high surface area and active sites. A new CoP/CoFeP nanosheet array catalyst, derived from Prussian blue analogue, demonstrates excellent OER efficiency with a low Tafel slope and high current density. This research contributes to the development of efficient OER catalysts for sustainable hydrogen production.