A heterogeneous cobalt cubane polymer co-catalyst for cooperative water oxidation.

We achieve a successful transition of Co 4 O 4 molecules from a homogeneous to a heterogeneous system by modifying the functional groups at their termini. The resulting cocatalyst, denoted as Co 4 O 4 -poly, not only preserved the catalytic sites of Co 4 O 4 molecules but also exhibited outstanding performance in catalyzing water oxidation.