Metal-Organic Framework-Assisted Synthesis of Compact FeO Nanotubes in CoO Host with Enhanced Lithium Storage Properties.

Transition metal oxides are promising candidates for the high-capacity anode material in lithium-ion batteries. The electrochemical performance of transition metal oxides can be improved by constructing suitable composite architectures. Herein, we demonstrate a metal-organic framework (MOF)-assisted strategy for the synthesis of a hierarchical hybrid nanostructure composed of FeO nanotubes assembled in CoO host. Starting from MOF composite precursors (Fe-based MOF encapsulated in a Co-based host matrix), a complex structure of CoO host and engulfed FeO nanotubes was prepared by a simple annealing treatment in air. By virtue of their structural and compositional features, these hierarchical composite particles reveal enhanced lithium storage properties when employed as anodes for lithium-ion batteries.