Chem. Commun., 2025, Advance Article DOI: 10.1039/D5CC05131B, Communication Zixiong Wang, Haoyu Feng, He Zhu Combining the multiple active sites in metalloporphyrin-based COF and conductive CNT substrate, a COF-based composite electrode, Ni-COF/50%CNT, was designed and optimized as an efficient and stable OER electrocatalyst.