Room-Temperature Hydrogen Adsorption via Spillover in Pt Nanoparticle-Decorated UiO-66 Nanoparticles: Implications for Hydrogen Storage

Abstract

In order to improve room-temperature hydrogen storage, platinum (Pt) nanoparticles (NPs) are doped onto the Zrterephthalate metal−organic framework (MOF) UiO-66 and its derivatives for H 2 adsorption via spillover effect under a highpressure environment. Different MOF synthetic modulators are applied for MOF nanoparticle size manipulation, and surface functionality is designed to improve Pt dispersion. Powder X-ray diffraction shows retained MOF integrity after Pt decoration, and the broad Pt peak indicates well-dispersed Pt NPs. The MOF high specific surface areas are slightly reduced after Pt doping with the retained micropore size in the nanometer scale. The hydrogen storage capacity can be improved from 0.08 to 0.71 wt % at 300 K and 30 bar. It is suggested by X-ray photoelectron spectroscopy that the hydrogen capacity enhancement is due to H 2 spillover in which spiltover hydrogen radicals hydrogenate carboxylates in MOF supports. Although Pt aggregation reduces H 2 capacity in cycles, it is found that MOF and Pt nanoparticle sizes are critical for H 2 spillover for subsequent room-temperature hydrogen storage.

Enhanced performance and stability of low-bandgap mixed lead–tin halide perovskite photovoltaic solar cells and photodetectors via defect passivation with UiO-66-NH2 metal–organic frameworks and interfacial engineering

“…This result is in line with the theoretical values and meets our expectations. 43 After incorporating the MOFs into the perovskite, the BET specific surface areas of the UiO-66/perovskite and UiO-66-NH 2 /perovskite composites are significantly reduced, lower than 15 m 2 g −1 , which approaches that of the perovskite. This implies that the perovskite is confined in the MOFs' micropores or that the MOF concentration is low, thus reducing the SSA.…”

“…UiO-66 was synthesized by a solvothermal process modified from our report. 43 Briefly, zirconium tetrachloride (0.240 g) and terephthalic acid (0.171 g) were dissolved in 60 mL N , N -dimethylformamide (DMF) at room temperature. MOF precipitation can be seen after being heated at 120 °C for 24 hours.…”

Porous metal–organic frameworks for hydrogen storage

“…10c). 81 After Pt doping, the H 2 uptake capacity was increased from 0.08 to 0.71 wt%, which XPS studies revealed is due to H 2 spillover in which spiltover H 2 radicals hydrogenate carboxylates in MOF supports. Besides, it was found that the MOF and Pt nanoparticle size have a significant effect on the H 2 adsorbed in the pore.…”

Recent Progress Using Solid-State Materials for Hydrogen Storage: A Short Review

“…Understanding the behaviors of hydrogen adsorption is important for improving hydrogen storage capacity. Moreover, the sorption density on the physisorption of carbonaceous materials is extremely low and has a low hydrogen capacity [141][142][143][144]. Therefore, a progressive strategy is required to create stronger attraction between hydrogen and adsorbents.…”