Breakthrough Discovery Reveals Hidden Oxygen Flow Deep Inside Catalysts
April 21, 2026 — In a landmark study published in Nature, researchers have for the first time directly observed oxygen atoms moving through the interior of a catalyst, overturning long-held assumptions that catalytic activity occurs only on the surface. This discovery of “bulk oxygen spillover” reveals that the internal structure of catalysts actively participates in chemical reactions, opening new pathways for designing more efficient and sustainable energy technologies.
Rethinking How Catalysts Work
For decades, scientists understood catalysis primarily as a surface phenomenon. In reactions like the oxygen evolution reaction (OER) — a key step in splitting water to produce clean hydrogen fuel — it was believed that oxygen molecules formed exclusively from water molecules at the catalyst’s surface. However, recent breakthroughs now present that oxygen atoms from within the catalyst’s own lattice can directly participate in bond formation.
This alternative pathway, known as the Lattice Oxygen Mechanism (LOM), allows certain catalysts to bypass scaling relations that limit the performance of traditional surface-only mechanisms like the Adsorbate Evolution Mechanism (AEM). Materials exhibiting LOM can achieve unexpectedly high OER activity, offering a promising route toward more efficient electrocatalysts for green hydrogen production.
First Direct Observation of Bulk Oxygen Spillover
The breakthrough came from a team led by Prof. Tao Zhang and Prof. Yanqiang Huang at the Dalian Institute of Chemical Physics (DICP) of the Chinese Academy of Sciences (CAS), in collaboration with researchers from the Southern University of Science and Technology. Using environmental transmission electron microscopy, they tracked oxygen movement in ruthenium-doped rutile titanium dioxide (Ru/rutile-TiO2) catalysts.
Their findings, published in Nature on April 15, 2026, provide the first direct evidence of bulk oxygen spillover — the migration of oxygen atoms through the catalyst’s interior rather than just along its surface. This observation confirms that the bulk material is not a passive scaffold but an active participant in the reaction process.
Implications for Catalyst Design and Clean Energy
The ability to harness internal oxygen pathways could transform catalyst design across multiple industries. By enabling lattice oxygen to participate in reactions, scientists may develop:
- More active and durable electrocatalysts for water splitting
- Improved systems for renewable energy storage
- Lower-cost alternatives to scarce materials like iridium
Notably, ruthenium-based oxides are already being explored as promising substitutes for iridium in proton-exchange membrane water electrolysis. Recent advances using machine learning-guided discovery have identified compositions such as Ru0.5Zr0.1Zn0.4Ox that achieve high activity and significantly reduced ruthenium dissolution in acidic conditions — key challenges for commercial viability.
A New Frontier in Catalysis
This discovery shifts the paradigm from viewing catalysts as mere surfaces where reactions occur to recognizing them as dynamic materials where internal atomic motion drives performance. As researchers continue to map and control these hidden pathways, the potential emerges for smarter, more efficient systems that maximize the use of abundant materials although minimizing energy loss.
By revealing the hidden dance of oxygen within catalysts, this work not only deepens our fundamental understanding of catalysis but also paves the way for innovations critical to a sustainable energy future.
Sources:
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences. (April 20, 2026). Breakthrough discovery reveals hidden oxygen flow deep inside catalysts. ScienceDaily.
- Catalyst Dev Sci. (2026). Unlocking the Oxygen Evolution Secret: The Hidden Power of Lattice Oxygen.
- Nature. (April 15, 2026). Stable acidic oxygen-evolving catalyst discovery through mixed acceleration workflow.