期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 143, 期 28, 页码 10727-10734出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.1c04926
关键词
-
资金
- US Department of Energy, Office of Energy Efficiency and Renewable Energy [DE-EE0007046]
By improving packing efficiency and crystal size distributions, the hydrogen storage density of metal-organic frameworks (MOFs) can be significantly enhanced, maximizing storage capacity. System model projections show that engineering crystal morphology/size or using bimodal distributions of cubic crystal sizes can surpass the current volumetric capacity of compressed storage systems.
Metal-organic frameworks (MOFs) are promising materials for hydrogen storage that fail to achieve expected theoretical values of volumetric storage density due to poor powder packing. A strategy that improves packing efficiency and volumetric hydrogen gas storage density dramatically through engineered morphologies and controlled-crystal size distributions is presented that holds promise for maximizing storage capacity for a given MOF. The packing density improvement, demonstrated for the benchmark sorbent MOF-5, leads to a significant enhancement of volumetric hydrogen storage performance relative to commercial MOF-5. System model projections demonstrate that engineering of crystal morphology/size or use of a bimodal distribution of cubic crystal sizes in tandem with system optimization can surpass the 25 g/L volumetric capacity of a typical 700 bar compressed storage system and exceed the DOE targets 2020 volumetric capacity (30 g/L). Finally, a critical link between improved powder packing density and reduced damage upon compaction is revealed leading to sorbents with both high surface area and high density.
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