Fe3O4@coordination polymer microspheres with self-supported polyoxometalates in shells exhibiting high-performance supercapacitive energy storage.

An exquisitely structured CPP consisting of a self-supported POM-Zn(ii) coordination polymer as the shell and a Fe(3)O(4) cluster as the core was synthesized, which could be fabricated as a supercapacitive film electrode showing prominent electrochemical activities for enormous energy storage.