A comprehensive strategy for the
morphological control of octahedral
and spindle Fe-based metal–organic frameworks (Fe-MOFs) via
microwave-assisted adjustment is proposed in this research. Afterward,
in situ copyrolysis under N2 atmosphere contributes to
the fabrication of two shape-maintained FeF3·0.33H2O nanostructures (named O-FeF3·0.33H2O and S-FeF3·0.33H2O, respectively) with
confined hierarchical porosity and graphitized carbon skeleton. The
lithium storage performances for the MOF-derived octahedral O-FeF3·0.33H2O and spindle S-FeF3·0.33H2O composites are investigated, and the prospective lithium
storage mechanism is discussed. As a result, the main product of the
porous O-FeF3·0.33H2O structure is found
to be a promising cathode material for lithium ion batteries owing
to its advantageous electrochemical capability. Even after being cycled
over 1000 times at 2 C (1 C = 237 mAh g–1), the
capacity attenuation rate of the as-prepared O-FeF3·0.33H2O electrode is as low as 0.039% per cycle. The combination
of proper octahedral morphology and highly graphitized carbon modification
can not only enhance the conductivity of the cathode but also promote
the diffusion of Li+ effectively. The remarkable performance
of octahedral O-FeF3·0.33H2O can be confirmed
by the Li-ion diffusion coefficient (D
Li
+) calculation analysis and kinetics analysis of lithium
storage behavior.
A three-dimensional (3D) anionic Cd-MOF, namely, (Me 2 NH 2 ) 2 [Cd(PTC)]• 2H 2 O, assembled by a Cd(II) salt and a planar aromatic core ligand containing tetracarboxylate groups (H 4 PTC = pyrene-1,3,6,8-tetracarboxylic acid), has been successfully constructed through a solvothermal method. In the structure of the fabricated Cd-PTC, each Cd(II) center links four carboxyl groups, and each PTC 4− ligand connects four Cd(II) ions through the deprotonated carboxylate groups in bidentate chelating style, generating a 3D network with one-dimensional rhombic channels. This topology was considered to be a 3D (4,4)-connected pts net. Gas sorption measurements reveal that desolvated Cd-PTC has a strong interaction with CO 2 and displays highly selective CO 2 capture between the mixed gases CO 2 /CH 4 and CO 2 /N 2 . Meanwhile, luminescent studies reveal that Cd-PTC can detect nitroaromatic explosives, especially exhibiting significant sensitivity for 2,4,6trinitrophenol in DMF solvent.
In this work, a new design of a zeolitic imidazolate framework-derived
CoF2/Fe2O3 hybrid structure is reported via a simple copyrolysis strategy. The in situ generated C/N doped framework effectively enhances its own conductivity
and offers more Li+-active insertion sites. The distinctive
nanoscale structure not only provides adequate space to accommodate
volume changes, but also promotes electrolyte penetration into the
electrode, leading to higher utilization of active materials and faster
ion/electron transfer during cycling. As a result, an improved electrochemical
performance of 130.4 mA h g–1 was obtained after
400 relatively long-term cycles at a current density of 100 mA g–1. Additionally, the surface-induced capacitive feature
and profitable lithium ion diffusion (D
Li+
) coefficient give further insights into the lithium
storage mechanism of the fabricated electrode. We believe that this
novel strategy may shed light into fabricating promising electrode
materials derived from metal–organic frameworks for energy
storage.
Metal–organic
framework-derived lithium cobaltate nanoparticles
were fabricated by annealing of the ZIF-67 precursor with Li2CO3 under air, followed by homogeneous AlF3 coating and carbon nanotubes (CNTs) wrapping. The as-prepared AlF3-coated LiCoO2/CNTs electrode can act as a potential
cathode for enhanced lithium storage at both room temperature and
an elevated temperature of 50 °C.
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