An In-Situ-Grown Cu-BTC Metal–Organic Framework / Graphene Oxide Hybrid Adsorbent for Selective Hydrogen Storage at Ambient Temperature

Abstract

A Cu-BTC metal−organic framework hybrid with graphene oxide (GO) having ultralow GO content (1 wt %) was developed in situ and was explored as a medium for hydrogen storage at ambient temperature. The structural integration of both counterparts in the Cu-BTC/GO hybrid was attained through interaction of the Cu centers with the oxygen-bearing groups of GO by equatorial and axial coordination upon in-situ growth. As a result, Cu-BTC/GO showed enhanced surface area, pore volume, and microporosity, while its hydrogen storage capacity was increased by ∼60%, compared to pure Cu-BTC at 298 K and 1 bar, accompanied by low heat of adsorption (<16.3 kJ mol −1 ), and 100% recovery of the initial capacity, as tested upon six successive PSA cycles. For hydrogen purification applications, selective hydrogen storage was also investigated and it was found that Cu-BTC/ GO exhibited a 49% and 38.5% higher H 2 /O 2 and H 2 /N 2 selectivity, respectively (10.13 for H 2 /O 2 and 8.64 for H 2 /N 2 ), at 298 K and 1 bar compared to that of the pure Cu-BTC. The respective selectivity values of the Cu-BTC/GO adsorbent at 100 mbar reached 42.22 and 71.54. Furthermore, the GO incorporation into the hybrid was found to suppress hydrophilicity compared to the pure MOF. This work brings up the potential of in-situ-developed MOF/GO hybrids as multifunctional hydrogen storage media.

CO2, CH4, and H2 Adsorption Performance of the Metal–Organic Framework HKUST-1 by Modified Synthesis Strategies

“…To confirm the successful synthesis of MOF HKUST-1 by three different strategies, the XRD diffractograms were collected for all three materials, as shown in Figure 1. All samples match well with the standard reference patterns and show all the major indexed peaks, 37,38 confirming the formation of the HKUST-1 phase along with a minor impurity peak at 26.67°, which possibly corresponds to copper hydroxide carbonate (JCPDS: 01-072-0539) in all three synthesis strategies. However, HKUST-Ca presents more intense and narrow peaks indicative of higher crystallinity and higher crystal size.…”

Highly improved pH-Responsive anticancer drug delivery and T2-Weighted MRI imaging by magnetic MOF CuBTC-based nano/microcomposite

“…MAA-Fe 3 O 4 NPs exhibits the characteristic FT-IR peak specially at 588 belonged to the Fe–O vibration, a small peak at 2693 cm −1 related to S−H stretching vibration and a sharp peak at 1618 cm −1 as well as a broad peak at 3422 cm −1 attributed to the starching C=O and H–O vibrations of MAA located on the surface of Fe 3 O 4 , respectively ( Bandosz and Petit, 2011 ; Zeng et al, 2013 ). Notably, the peaks at 1090 and 732 cm−1 (C−O−Cu), as well as the other 588 (Fe–O), 1358 (C–O) and 1642 cm −1 (C=O) intensified in the FT-IR spectrum of Fe 3 O 4 @[Cu 3 (BTC) 2 ] indicate the successful formation of Fe 3 O 4 @[Cu 3 (BTC) 2 ] composites ( Varghese et al, 2022 ). The peak intensity was lower in Fe 3 O 4 @[Cu 3 (BTC) 2 ] due to the immobilization caused by coating [Cu 3 (BTC) 2 ].…”

Pristine Metal–Organic Frameworks and their Composites for Renewable Hydrogen Energy Applications

“…For H 2 storage area, it has been reported that the doping of carbonaceous materials into MOFs could enhance H 2 uptake via reversible physisorption way owing to its rich sur faceactive sites, power dispersive force, improved H 2 binding enthalpies, and enhanced stability. [173][174][175] For functional materials anchored into MOFs, the functional units usually serve as active centers or performanceenhancing cocatalysts/auxiliaries while the MOFs serve as porous supports to immobilize and confine these materials. Moreover, the strong interplay and synergistic effects between anchored functional materials and MOFs can greatly improve the performance of MOF composites for H2 economy.…”

“…For H 2 storage area, it has been reported that the doping of carbonaceous materials into MOFs could enhance H 2 uptake via reversible physisorption way owing to its rich surface‐active sites, power dispersive force, improved H 2 binding enthalpies, and enhanced stability. [ 173–175 ]…”