Metal organic frameworks
(MOFs) have promising application prospects
in the field of hydrogen storage. However, the successful application
of MOFs in the field is still limited by their hydrogen storage capacity.
Herein, a series of M
x
M
1–
x
(
BDC
)TED
0.5
(M = Zn,
Cu, Co, or Ni) with a bimetallic structure was constructed by introducing
two metal ions in the synthesis process. The results of X-ray diffraction,
scanning electron microscopy, energy-dispersive spectroscopy, X-ray
photoelectron spectroscopy, and inductively coupled plasma showed
that the bimetallic structure with different content ratios can be
stably constructed by a hydrothermal method. Among them, the Cu-based
bimetal MOFs Cu
0.625
Ni
0.375
(BDC)TED
0.5
exhibited the best hydrogen storage capacity of 2.04 wt% at 77 K
and 1 bar, which was 22% higher than that of monometallic Ni(
BDC
)TED
0.5
. The enhanced hydrogen storage capacity
can be attributed to the improved specific surface area and micropore
volume of bimetal MOFs by introducing an appropriate amount of bimetallic
atoms.
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