“…Along with the intensive research efforts in developing catalysts with high performance, low cost and environmental friendliness, cobalt-based complex catalysts represented by cobalt phthalocyanine (CoPc) have emerged as a new alternative class of materials. 15,16 Transition-metal complexes, for example, CoPc, with well-defined active sites and adjustable structures have been widely used for various catalytic reactions. 17–19 However, the major challenge of utilizing homogeneous CoPc for catalysis application lies in the unstable properties, such as uncontrollable aggregation, oxidative self-destruction in the oxidizing solvent, and undesirable reduction of the Pc ligand in the reductive media, which resulted in poor long-term stability.…”