Factors Affecting Hydrogen Adsorption in Metal–Organic Frameworks: A Short Review

Abstract

Metal–organic frameworks (MOFs) have significant potential for hydrogen storage. The main benefit of MOFs is their reversible and high-rate hydrogen adsorption process, whereas their biggest disadvantage is related to their operation at very low temperatures. In this study, we describe selected examples of MOF structures studied for hydrogen adsorption and different factors affecting hydrogen adsorption in MOFs. Approaches to improving hydrogen uptake are reviewed, including surface area and pore volume, in addition to the value of isosteric enthalpy of hydrogen adsorption. Nanoconfinement of metal hydrides inside MOFs is proposed as a new approach to hydrogen storage. Conclusions regarding MOFs with incorporated metal nanoparticles, which may be used as nanoscaffolds and/or H2 sorbents, are summarized as prospects for the near future.

Post-synthetically modified metal–porphyrin framework GaTCPP for carbon dioxide adsorption and energy storage in Li–S batteries

“…The high surface area, crystallinity, controllable pore size, flexibility, and functionalization of the porous surface are some of the main characteristics which determine the versatility of MOFs. 1 Hence, MOFs are investigated in applications such as gas storage and separation, 2–6 catalysis, 7–9 drug delivery, 10–12 proton conductivity, 13–15 magnetism 16–19 etc. 20 In our research for discovering novel original porous frameworks with multifunctional linkers, we mainly focused on porphyrinic building blocks.…”

A comprehensive review of hydrogen production and storage: A focus on the role of nanomaterials

“…An essential requirement in the selection of ligands for the development of porous MOFs is that the overall network be neutral. Otherwise, charged networks will cause the positioning of counter ions within the framework, which eventually reduces the porosity and H2 storability of the framework material [202,203]. Unlike mesoporous oxide-based materials like zeolites, the structure and topology of the interior surface (of MOFs) on which H2 is adsorbed can be easily modified for H2 storage enhancement (via metal selection and ligand functionalization) [204].…”

“…The effect of this method is also somewhat pressure-dependent. Sule et al [204], Zelenák and Saldan [202] Functionalization of ligand structure Covalent, coordinate, and covalent-coordinate modification are the primary enhancement routes. Aromatic substituents have shown promising potential for functionalizing ligand structures (due to additionally provided binding sites); thus, yielding improved H2 uptake compared to the pristine MOFs.…”

Recent Progress in the Removal of Legacy and Emerging Organic Contaminants from Wastewater Using Metal–Organic Frameworks: An Overview on Adsorption and Catalysis Processes

“…In general, crystal shape of a MOF is related to its internal structure (see Figure 1 B for MOF-5 [ 45 ], UiO-66, and ZIF-8) [ 44 ].…”