Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 47, Issue 8, Pages 5393-5402Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2021.11.168
Keywords
Adsorption; Metal-organic frameworks; Molecular simulation; Interaction strength; Interface
Categories
Funding
- Basic Research Foundation of Shenzhen [JCYJ20190809101403595]
- Analytical & Testing Center of Huazhong University of Science and Technology
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Li+ doping significantly improves the hydrogen storage performance of metal-organic frameworks (MOFs). This study demonstrates that Li+-doped MIL-100(Fe)/GO composite shows higher hydrogen uptake and more accessible adsorption sites compared to Li+-doped MIL-100(Fe), resulting in enhanced hydrogen storage capacity.
Li+ doping is regarded as an effective strategy to enhance the room-temperature hydrogen storage of metal-organic frameworks (MOFs). In this work, Li+ is doped into both MIL-100(Fe) and MIL-100(Fe)/graphene oxide (GO) composite, and it is demonstrated that the hydrogen uptake of Li+ doped MIL-100(Fe)/GO (2.02 wt%) is improved by 135% compared with Li+ doped MIL-100(Fe) (0.86 wt%) at 298 K and 50 bar, which is ascribed to its higher isosteric heat of adsorption (7.33 kJ/mol) resulting from its more accessible adsorption sites provided by doped Li+ ions and ultramicropores. Grand canonical Monte Carlo (GCMC) simulation reveals that Li+ ions distributing in the interface between MIL-100(Fe) and GO within MIL-100(Fe)/GO composite is favorable for hydrogen adsorption owing to the increased number of adsorption sites, thus contributing to the enhanced hydrogen storage capacity. These findings demon-strate that MIL-100(Fe)/GO is a more promising Li+ doping substrate than MIL-100(Fe). (C) 2021 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.
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