POM-Based MOF-Derived Co ₃O ₄/CoMoO ₄ Nanohybrids as Anodes for High-Performance Lithium-Ion Batteries

Abstract

Polyoxometalate (POM)-based metal–organic framework (MOF)-derived Co ₃O ₄/CoMoO ₄ nanohybrids were successfully fabricated by a facile solvothermal method combined with a calcination process, in which a Co-based MOF, that is, ZIF-67 acts as a template while a Keggin-type POM (H ₃PMo ₁₂O ₄₀) serves as a compositional modulator. The materials were characterized through scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), energy-dispersive spectroscopy (EDS) mapping, and electrochemical measurements. When the Co ₃O ₄/CoMoO ₄ nanohybrids were applied as anode materials for lithium-ion batteries (LIBs), they display large lithium storage capacity (around 900 mAh g ^–1 at 0.1 A g ^–1) and high cycling stability, and they can also exhibit good rate performances. This work might shed some light on the POM-based MOF host–guest synthesis strategy for the preparation of polymetallic oxides for enhanced electrochemical energy storage and further applications.