Recent findings from a team led by researchers at the Dalian Institute of Chemical Physics reveal a novel mechanism of oxygen spillover in Ru/TiO2 catalysts. Using in situ environmental transmission electron microscopy, they demonstrated that lattice oxygen can migrate directly from the TiO2 substrate to the supported Ru particles through the Ru/TiO2 interface, challenging the conventional understanding of spillover as a surface-diffusion process. This mechanism was observed specifically in Ru/rutile-TiO2 catalysts, where the subsurface lattice of TiO2 exhibited reversible strain, facilitating oxygen transport.

The implications of this discovery are significant for catalyst design and optimization. The research indicates that the structural adaptability at the metal-support interface plays a critical role in controlling oxygen spillover. The ability to switch this spillover on or off, depending on the type of TiO2 (rutile vs. anatase), highlights the importance of rationally engineered interfaces in enhancing catalytic activity. The real-time atomic-scale observations provide a deeper understanding of the dynamics at play during catalytic reactions, which could inform the development of more efficient catalysts for industrial applications.

This work shifts the paradigm in catalyst research by emphasizing the need to consider subsurface interactions alongside traditional surface phenomena. It suggests that future catalyst development could benefit from a focus on interfacial engineering to enhance spillover effects, potentially accelerating the timelines for drug development and other applications in longevity science. By leveraging the insights gained from this study, researchers can explore new avenues for optimizing metal-support interactions, ultimately leading to more effective catalytic systems.

Source: nature.com