In-situ one-step synthesis of activated Carbon@MIL-101 (Cr) composites for hydrogen storage. (1st December 2022)

• Record Type: Journal Article
• Authors: Luo, Lu; Zhou, Yalan; Yan, Wen; Luo, Lingcong; Deng, Jianping; Fan, Mizi; Zhao, Weigang
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 93(2022)
• Page Start: 39563
• Page End: 39571
• Publication Date: 2022-12-01
• Subjects: Activated carbon -- Metal-organic frameworks (MOFs) -- MIL-101(Cr) MOF -- Hydrogen storage; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.09.128
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Metal-organic frameworks (MOFs) unlocked new prospects of developing novel adsorbing materials for H2 storage. However, MOF porosity is not yet fully utilized. To compensate for that disadvantage, we synthesized MIL-101(Cr) MOF-based activated carbon AC@MIL-101 (Cr) composites using in situ hydrothermal method. Different amounts of activated carbon (AC) derived from fir bark were added to adjust the pore structure of the resulting MOF-based composites. The pore number and their sizes increased and decreased, respectively, after pristine MIL-101(Cr) was combined with AC. The surface area and pore volume of pristine MIL-101(Cr) were equal to 2299 m 2 /g and 1.06 cm 3 /g, respectively. These values became equal to 3367 m 2 /g and 1.64 cm 3 /g after AC was combined with MIL-101(Cr) to form AC@MIL-101(Cr) composite. The highest H2 uptake by AC@MIL-101(Cr) was equal to 6.93 wt % at 77 K and 40 bar. Such excellent hydrogen storage performance (a 32.3% increase than what was observed for unmodified MIL-101(Cr) material) was attributed to a synergy between AC and MIL-101(Cr). Graphical abstract: [ Image 1 ] Highlights: Proportion of AC@MIL-101 (Cr) composites have significantly effect on H2 storage. AC@MIL-101(Cr) composite has the highest surface area of 3367 m 2 /g. The largest H2 storage capacity obtained was 6.93 wt % at 77 K and 40 bar. H2 storage performance benefit from the synergistic effect of both AC and MIL-101.