How can the 2025 Nobel Prize in Chemistry awarded for metal–organic frameworks (MOFs) be understood in simple, everyday terms?

2026-10-26 One gram of MOF-210, when fully unfolded, has a measured internal surface area of approximately 6,240 square meters—roughly the size of a standard football field [1]. By comparison, activated carbon typically offers 1,000–2,000 m²/g, and zeolites even less. Before MOFs emerged, humanity relied mainly on these traditional porous materials for adsorption and separation; their pore capacity had already approached physical limits. MOFs, however, catapulted the specific surface area of porous materials up by an entire order of magnitude. But what’s truly counterintuitive about MOFs isn’t just that they have *many* pores—it’s *how* those pores are formed. In activated carbon or zeolites, pores resemble random cracks and gaps left behind during manufacturing: how many pores you get, and their shape, is largely accidental—like randomly chiseling holes into a rough stone block. MOFs take the opposite approach: metal nodes serve as vertices, and organic linkers act as edges, assembling into precise, three-dimensional periodic grids—much like snapping together LEGO bricks. Pore size is dictated by linker length; pore shape, by node geometry—both predetermined at the 'blueprint' design stage, long before synthesis. This leap from 'trial-and-error' to 'precision design' marks a historic turning point in materials science. In 1999, Yaghi’s team published MOF-5 in *Nature*, constructing a cubic framework using zinc clusters and terephthalic acid linkers, with pores ~1.2 nm in diameter. That paper not only demonstrated an exceptionally stable and highly porous structure but also introduced the concept of 'reticular chemistry': material synthesis was no longer just about discovering chemical reactions in flasks—it became about designing topological assemblies [2]. This shift moved chemistry from endless empirical experimentation at the bench toward modern engineering guided by pre-drawn schematics. Over 90% of the framework’s interior volume is empty space. So why doesn’t the structure collapse once solvent molecules inside the pores are removed? This is the most physically counterintuitive question. The answer lies in the directionality of coordination bonds and topological constraints. Metal nodes possess fixed coordination geometries; organic linkers bind to metals via carboxylate groups, and bond directions are rigidly constrained by linker geometry. The framework’s rigidity does not rely on the absolute strength of any single bond, but rather on each node being pulled simultaneously from multiple directions by several linkers—collapse would require breaking multiple coordination bonds at once, which is energetically extremely unfavorable. Robson first proposed in the 1990s that topological rigidity in coordination polymers could stabilize open frameworks [3]. Northrop (Masaru Kitaura) reported in 1997 the first coordination polymer exhibiting permanent porosity, experimentally confirming via gas adsorption that pores remain intact even after guest molecules are removed [4]. This step was pivotal: prior to this, the chemistry community widely doubted whether coordination polymers could retain structural integrity after evacuation—fearing they would instantly collapse like umbrellas stripped of their ribs.

The hydrogen storage mechanism of MOF materials: an innovative hydrogen storage technology

• Ultra-high specific surface area means MOFs provide abundant adsorption sites, enabling large-scale hydrogen storage. • 'Low parking-space friction': Adsorption enthalpy is only a few to tens of kJ/mol—hydrogen can be loaded simply by pressurization, and readily released upon depressurization or heating, offering excellent cyclability and fast kinetics. ## Key Design Principles for MOF-Based Hydrogen Storage ### 1. Pore Size Matching Hydrogen molecule diameter ≈ 0.3 nm; optimal pore size ranges from 0.6–1.2 nm, balancing multi-point contact and packing density. ### 2. Site Engineering Introducing open metal sites (OMS) or polar functional groups enhances interaction with H₂, raising adsorption enthalpy to 10–15 kJ/mol. ### 3. Deliverable Capacity From an engineering perspective, the critical metric is the *net usable difference*—how much hydrogen can be both loaded *and* reliably delivered within practical temperature and pressure windows—not merely the maximum adsorption capacity. ## Challenges in MOF-Based Hydrogen Storage Despite numerous advantages, MOF-based hydrogen storage still faces key challenges: 1. Room-Temperature Limitation: At ambient temperature, hydrogen molecules possess high kinetic energy, making them difficult to retain via weak van der Waals forces alone. Hence, most testing and application occurs at 77 K (liquid nitrogen temperature). 2. Advancing Room-Temperature Performance: Strategies such as incorporating open metal sites, nanoscale metal particle spillover, and high-density pelletization are under active investigation—but remain works in progress. ## Application Prospects for MOF-Based Hydrogen Storage Despite existing hurdles, MOF-based hydrogen storage holds broad promise: - The design logic—combining ultra-high surface area, tailored pore size, and scalable engineering—enables top-performing MOFs to exceed the volumetric deliverable capacity of conventional 700-bar ambient-temperature gas cylinders of equal volume. - Representative 'star' MOFs—including MOF-5, HKUST-1, MOF-177, and the NU/PCN/UMCM series—embody this design philosophy. - Fundamentally, MOF-based hydrogen storage works by densely arranging vast numbers of weak-interaction sites, so that countless tiny H₂–pore-wall interactions collectively yield macroscopically useful storage capacity. Low temperature stabilizes these weak interactions; open metal sites deepen individual binding strength; and optimal pore size maximizes multi-point contact efficiency.

University of Birmingham Lab Breaks Record with 16-Metal MOF

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University of Birmingham researchers synthesized a metal-organic framework with 16 metals, setting a new record. Tuning metal ratios enables control over CO2 adsorption and other material properties.

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2026-10-30

University of Birmingham Lab Breaks Record with 16-Metal MOF

University of Birmingham Lab Breaks Record with 16-Metal MOF

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