Hollow FeCo-FeCoP@C nanocubes embedded in nitrogen-doped carbon nanocages for efficient overall water splitting

Designing readily available and highly active electrocatalysts for water splitting is essential for renewable energy technologies. Here we present the construction of [email protected] hollow nanocubes encapsulated in nitrogen-doped carbon nanocages ([email protected]@NCCs) through controlled carbonization and subsequent phosphorization of a Prussian blue analogue. With stronger electronic interaction and hollow structure, the as-obtained [email protected]@NCCs material requires small overpotentials of 91 mV and 280 mV to deliver 10 mA cm−2 in 1 M KOH toward hydrogen and oxygen evolution, respectively. More importantly, applying this material for overall water splitting, it only requires 1.64 V to afford 10 mA cm−2 and exhibits impressively durability over 40 h without obvious performance decay. The present approach inspires potentials for the controllable synthesis of multi-component catalysts for practical applications.