Formation of Co3O4 hollow polyhedrons from metal-organic frameworks and their catalytic activity for CO oxidation

In this article, we report a novel and facile strategy for the large-scale fabrication of Co3O4 hollow polyhedrons through direct decomposition of zeoliticimidazolate framework-67 (ZIF-67) polyhedrons in air. The resulted Co3O4 hollow polyhedrons exhibit excellent catalytic activities, cycling stability, and long-term stability in the low temperature for CO oxidation. The improved catalytic activities can be attributed to its unique structures, in which the Co3O4 hollow structures with hierarchically porous shells is beneficial for CO gaseous molecules entering into their internal structures and provide more active sites for CO oxidation. (C) 2016 Published by Elsevier B.V.