Hollow CeO_x/CoP Heterostructures Using Two‐dimensional Co−MOF as Template for Efficient and Stable Electrocatalytic Water Splitting

Abstract Constructing heterostructures has been identified as an efficient means to optimize the catalytic activity and boost electrocatalytic performances. Herein, we designed a novel hollow CeO_x/CoP heterostructure supported on nickel foam (NF) through two‐dimensional Co‐metal‐organic framework (Co−MOF) as template, which could be used in electrocatalytic water splitting The hollow CeO_x/CoP/NF nanocatalyst demonstrated excellent activities toward oxygen evolution reaction (OER) in anode and hydrogen evolution reaction (HER) in cathode with relatively low overpotential (264 mV and 117 mV) at 10 mA cm⁻². Besides, the battery potential was only 1.63 V toward electrocatalytic water‐splitting at 10 mA cm⁻², and demonstrated excellent operational durability for 60 h. In this work, introducing CeO_x significantly enhanced the inherent activity of monophase transition‐metal phosphides (TMPs). Thus, this work may provide a new standpoint for constructing heterostructures with high activity containing transition‐metal compounds and rare earth species for electrocatalytic water splitting.