Metal-organic frameworks represent a marvel of chemical design, characterized by their unique architecture comprising metal ions or clusters coordinated to organic ligands to form highly ordered, porous crystalline structures. These materials exhibit extraordinary surface areas and tunable pore sizes, enabling applications in gas storage, catalysis, separation technologies, and sensor development. The remarkable versatility and bespoke nature of MOFs have revolutionized molecular engineering and materials science, making them indispensable tools in advancing sustainable technologies.

Professor Susumu Kitagawa’s seminal work spans over four decades, during which he extensively explored the design principles and functionalization of porous coordination polymers, now widely conceptualized as MOFs. His research significantly advanced the understanding of structural flexibility and dynamic behavior in MOFs, illuminating how these frameworks can adapt to environmental stimuli while maintaining robust crystalline integrity. Kitagawa’s investigations have paved the way for designing stimuli-responsive materials with potential applications in drug delivery systems and smart filtration membranes.

Australian chemist Richard Robson laid critical groundwork with his pioneering studies on polymeric frameworks in the late 1980s. His papers, particularly those published in the Journal of the American Chemical Society (JACS), detailed the synthesis and characterization of infinite polymeric frameworks assembled from rod-like metallic segments. Robson’s innovative synthetic strategies provided the blueprint for assembling highly ordered, three-dimensional MOFs with predetermined topologies. His insights into the coordination chemistry and structural motifs of these materials remain foundational to current MOF design paradigms.

Omar M. Yaghi, a towering figure in contemporary chemistry, has been instrumental in propelling MOFs from conceptual frameworks to practical functional materials. His influential 1995 JACS publication introduced a hydrothermal synthesis approach to produce MOFs featuring large, rectangular channels, facilitating enhanced molecular transport and storage capabilities. As an executive editor of JACS and a recipient of numerous accolades, including the 2009 ACS Award in the Chemistry of Materials, Yaghi has championed the modular construction of MOFs and pioneered reticular chemistry—a strategy that allows for the systematic assembly of extended frameworks through the design of molecular building blocks.

The collective achievements of Kitagawa, Robson, and Yaghi have not only expanded the fundamental knowledge of coordination chemistry but have also catalyzed the rapid evolution of MOFs into multifunctional materials with applications spanning environmental science, energy storage, and catalysis. Their collaborative yet geographically diverse contributions exemplify the power of cross-border scientific innovation and underscore chemistry’s intrinsic capacity to engineer solutions tackling global challenges.

Metal-organic frameworks’ porosity serves as a critical attribute enabling their utility in gas adsorption and separation technologies. The high internal surface area, some exceeding thousands of square meters per gram, allows these structures to selectively trap gases like carbon dioxide, methane, or hydrogen. This capability holds profound implications for carbon capture and clean energy storage, vital components in addressing climate change and developing sustainable fuel technologies.

Beyond environmental applications, MOFs have demonstrated significant promise as heterogeneous catalysts. The ordered arrangement of active metal sites within the frameworks enhances reaction specificity and efficiency, enabling catalysis of complex transformations under mild conditions. Such advances have spurred research into MOFs as economical, recyclable catalysts in pharmaceutical synthesis and fine chemicals production, thereby advancing green chemistry principles.

The dynamic tunability of MOFs, as emphasized in Professor Kitagawa’s research, opens avenues for stimuli-responsive systems where external triggers—such as temperature, light, or chemical environment—modulate the framework’s properties. This adaptability allows for the development of smart materials capable of controlled molecular release, sensing, or separations with unprecedented precision, offering transformative potential in healthcare and industrial processes.

Academic dissemination has been a vital component in the evolution of MOF research. Both Robson and Yaghi have extensively published articles in ACS journals, particularly the Journal of the American Chemical Society, which stands at the forefront of chemical literature. These publications have served as primary vehicles for sharing critical discoveries and cultivating a vibrant global community of researchers dedicated to reticular chemistry and materials innovation.

The American Chemical Society’s celebration of this Nobel Prize win highlights chemistry’s enduring capacity to innovate at the molecular level and engineer solutions addressing pressing global issues. The international composition of the awardees embodies the collaborative spirit fueling scientific discovery and reflects the interconnected nature of contemporary research ecosystems spanning continents and disciplines.

Looking forward, the recognition invigorates the field of MOFs, inspiring continued exploration into novel frameworks with enhanced functionality and sustainability. Emerging directions include the integration of MOFs with other nanomaterials to create hybrid systems and the exploitation of their porosity for harvesting renewable energy or toxic pollutant remediation, propelling the next generation of environmentally responsive technologies.

In essence, this Nobel Prize acknowledges a profound leap in materials chemistry led by Kitagawa, Robson, and Yaghi—and their collective vision that rational design at the atomic scale can unlock revolutionary applications. Their work epitomizes how fundamental chemical innovation translates into impactful solutions, affirming chemistry’s pivotal role in shaping a more sustainable and technologically advanced future.

Subject of Research: Development and application of metal-organic frameworks (MOFs) in chemistry

Article Title: Nobel Prize in Chemistry 2025 Honors Pioneers in Metal-Organic Frameworks Development

News Publication Date: October 8, 2025

Web References:

• Robson’s 1989 JACS papers:
  https://pubs.acs.org/doi/10.1021/ja00192a018
  https://pubs.acs.org/doi/10.1021/ja00197a079
• Yaghi’s 1995 JACS paper:
  https://pubs.acs.org/doi/10.1021/ja00146a033

References: Articles published in ACS peer-reviewed journals and coverage in Chemical & Engineering News

Keywords: Nobel Prize, Chemistry, Metal-Organic Frameworks, MOFs, Coordination Polymers, Materials Chemistry, Reticular Chemistry, Gas Storage, Catalysis, Porous Materials, Scientific Innovation, Sustainable Technologies

Single-atom catalysts, which feature isolated metal atoms dispersed on substrates, have been celebrated for their ability to maximize catalytic efficiency and atom utilization. Traditional thinking posits that the activity of these SACs for HER is mainly governed by the strength with which hydrogen atoms adsorb to the metal centers. The rationale being, hydrogen binding energy serves as a predictor for the energy barriers involved in proton-electron transfer steps that culminate in molecular hydrogen release. However, this research observes that this simplistic descriptor fails to account for the complex reality of surface interactions, especially under realistic operating conditions where various adsorbate species influence the catalytic environment.

A major hurdle in SAC design and HER performance is the phenomenon of site poisoning by reactive adsorbates such as hydroxyl radicals (HO) and oxygen radicals (O). These species can adhere to the active metal centers, interfering with the adsorption and reaction dynamics of hydrogen intermediates, thus suppressing catalytic activity. The study highlights that ignoring these poisoning effects leads to misleading predictions and suboptimal catalyst designs. Such insights emphasize the necessity to consider the adsorption coverage and the dynamic interfacial chemistry surrounding SACs, beyond just hydrogen-metal interactions.

Delving deeper into this complex interplay, the researchers employed advanced experimental techniques and theoretical modeling that simulated realistic adsorption environments. They discovered that hydrogen binding energy, calculated with a proper understanding of the adsorbate landscape, can serve as a more reliable predictor of catalytic activity. Intriguingly, when metal sites are compromised by poisoning, neighboring coordinating atoms—often nitrogen in metal-nitrogen-carbon (M-N-C) frameworks—can step in as alternative active sites. These adjacent nitrogen atoms offer an alternate pathway for HER, effectively circumventing the deactivation caused by adsorbate poisoning and maintaining catalytic performance.

This dual-site activity concept challenges the orthodox single-site framework and provides a more nuanced understanding of SAC behavior. The idea that non-metal coordinating atoms may significantly contribute to catalysis underlines the importance of holistic catalyst design strategies that integrate the entire local atomic environment. Such approaches could lead to enhanced catalyst durability and activity, especially in harsh conditions that involve aggressive adsorbates.

Another critical takeaway from this work is the refined use of catalytic descriptors. Historically, HBE was often regarded as the sole descriptor for SAC HER activity. The novel approach advanced by the research combined hydrogen binding energy with Gibbs free energy calculations to develop composite descriptors that better predicted spontaneous and efficient hydrogen evolution. This multidimensional descriptor provides a more predictive framework for tailoring catalysts that perform optimally across a wider range of pH conditions, surpassing the limitations previously imposed by HBE-only models.

The implications of this methodology extend into the design of next-generation catalysts specifically tailored for alkaline and other challenging environments. Alkaline conditions have been notoriously difficult for HER catalysts due to enhanced poisoning and different reaction kinetics. By considering HO* poisoning effects and enabling nitrogen sites as active centers, new classes of single-atom and dual-atom catalysts can be engineered with superior resistance to degradation and higher catalytic turnover.

The research team further underscores that their experimental approach is supported by the creation of an extensive catalyst database via the Digital Catalysis Platform. This platform aggregates key computational and experimental data sets, offering unparalleled access to the scientific community and accelerating the pace of discovery by enabling researchers worldwide to benchmark, validate, and build upon these findings.

Fundamentally, this study moves the catalytic science community toward a more realistic and comprehensive view of catalyst surface phenomena. It signals the diminishing supremacy of simplistic design rules and calls for a paradigm shift where intricate adsorbate interactions, poisoning dynamics, and multi-site catalysis are integrated into catalyst optimization strategies. As the race for more efficient and economic hydrogen production intensifies globally, these insights could prove instrumental in overcoming the kinetic bottlenecks that hinder scale-up and widespread adoption.

Moreover, the broader context of this advancement aligns well with Japan’s World Premier International Research Center Initiative (WPI), which aims to foster innovative research environments. Based at Tohoku University’s Advanced Institute for Materials Research, the Hao Li Lab exemplifies the international and interdisciplinary collaboration needed to tackle the multifaceted challenges in energy materials research. Their success typifies how cutting-edge fundamental science can fuel applied technological breakthroughs.

Looking ahead, the enhanced understanding of surface adsorbate dynamics and site cooperation in SACs sets the stage not only for improved HER catalysts but possibly for a wide range of electrochemical transformations, including CO2 reduction and nitrogen fixation. The principle of leveraging adjacent non-metal sites to bypass poisoning effects ignites fresh ideas for designing multifunctional catalysts that could revolutionize sustainable chemical production.

In essence, this work dismantles the dogma that hydrogen binding energy alone dictates hydrogen evolution efficacy on single-atom catalysts. It pioneers a holistic framework incorporating adsorbate coverage, poisoning resistance, and alternative active sites that collectively define catalytic success. For the clean energy community and catalysis scientists worldwide, this could mark a turning point, charting new pathways toward designing robust, efficient, and versatile catalysts indispensable for a green hydrogen economy.

Subject of Research: Hydrogen Evolution Reaction and Single-Atom Catalysts with Adsorbate Poisoning Dynamics

Article Title: Hydrogen Binding Energy Is Insufficient for Describing Hydrogen Evolution on Single-Atom Catalysts

News Publication Date: 20-Mar-2025

Web References: https://www.jsps.go.jp/english/e-toplevel/index.html, http://dx.doi.org/10.1002/anie.202425402

Image Credits: Hao Li et al.

Keywords

Catalysis, Active sites, Metals, Water molecules