The design of highly efficient, stable, and nonprecious-metal-based electrocatalysts for the oxygen evolution reaction (OER) has been a major research topic in the field of hydrogen production from electrolytic water splitting. In this work, a novel hierarchical hollow NiCo layered double hydroxide (NiCo LDH) with Cu-TCPP (TCPP = tetrakis(4-carboxyphenyl)-porphyrin) intercalation (denoted as