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2015 ; 5
(ä): 12045
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In-situ observation for growth of hierarchical metal-organic frameworks and their
self-sequestering mechanism for gas storage
#MMPMID26155988
Hyo Park J
; Choi KM
; Jeon HJ
; Jung Choi Y
; Kang JK
Sci Rep
2015[Jul]; 5
(ä): 12045
PMID26155988
show ga
Although structures with the single functional constructions and micropores were
demonstrated to capture many different molecules such as carbon dioxide, methane,
and hydrogen with high capacities at low temperatures, their feeble interactions
still limit practical applications at room temperature. Herein, we report in-situ
growth observation of hierarchical pores in pomegranate metal-organic frameworks
(pmg-MOFs) and their self-sequestering storage mechanism, not observed for
pristine MOFs. Direct observation of hierarchical pores inside the pmg-MOF was
evident by in-situ growth X-ray measurements while self-sequestering storage
mechanism was revealed by in-situ gas sorption X-ray analysis and molecular
dynamics simulations. The results show that meso/macropores are created at the
early stage of crystal growth and then enclosed by micropore crystalline shells,
where hierarchical pores are networking under self-sequestering mechanism to give
enhanced gas storage. This pmg-MOF gives higher CO2 (39%) and CH4 (14%) storage
capacity than pristine MOF at room temperature, in addition to fast kinetics with
robust capacity retention during gas sorption cycles, thus giving the clue to
control dynamic behaviors of gas adsorption.