POM-Based MOF-Derived Co₃O₄/CoMoO₄ Nanohybrids as Anodes for High-Performance Lithium-Ion Batteries

Abstract

Polyoxometalate (POM)-based metal–organic framework (MOF)-derived Co 3 O 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 3 PMo 12 O 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 3 O 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.

Construction of the POMOF@Polypyrrole Composite with Enhanced Ion Diffusion and Capacitive Contribution for High-Performance Lithium-Ion Batteries

“…To improve the overall electrochemical performance of POMs, functionalized single-walled carbon nanotubes were introduced by Sha et al However, the open structure is not stable, which makes it easy to cause the POMs to fall off during cycling, thereby affecting the cycle stability. Metal–organic frameworks (MOFs) with abundant ordered pores and high surface area have been widely explored in many research fields. − Combining POMs and MOFs to form polyoxometalate-based MOF compounds (POMOFs) could efficiently obviate the agglomeration and dissolution of POMs, and simultaneously it can provide additional active sites, which may be potential candidate materials for LIBs. , Unfortunately, the weak conductivity of POMOFs results in worse rate properties and severe capacity degradation during cycling …”

Metal–Organic Frameworks and Their Derived Functional Materials for Supercapacitor Electrode Application

“…For instance, Co 3 O 4 /CoMoO 4 nanocomposites have been obtained from polyoxometalate (POM)‐based MOFs, delivering a larger lithium storage capacity (≈900 mA h g −1 ) than those of individual Co 3 O 4 and CoMoO 4 . [ 98 ] Similarly, a spinel Co 3 O 4 –MnCo 2 O 4 nanocomposite has also been derived from MnO 2 /ZIF‐67, which showed a specific capacity of 614 mA h g −1 even at 5000 mA g −1 . [ 99 ] The introduction of oxygen vacancies, by surface engineering, can make a great contribution toward the electrochemical performance of metal oxides due to the regulation of band structures, along with increased active sites.…”

MOF‐Derived Materials Enabled Lithiophilic 3D Hosts for Lithium Metal Anode — A Review

“…[ 1‐6 ] Lithium‐ion batteries are recognized as a significant advancement in the field of energy storage technology and have a significant influence on contemporary civilization. [ 7‐14 ] However, the growing demand for higher energy densities cannot be met by the current battery configurations with graphite as the anode. In recent years, due to its ultrahigh specific capacity (3860 mAh/g) and the lowest electrochemical potential (–3.04 V vs. H + /H 2 ), metallic lithium (Li) has been dubbed as the "Holy Grail" anode for lithium metal batteries (LMBs).…”