Nanoparticle Ex-solution for Supported Catalysts: Materials Design, Mechanism and Future Perspectives

TLDR

Supported metal catalysts are pivotal in heterogeneous catalysis, enabling diverse applications such as renewable energy, sensors, automotive emission control, and chemical reforming, but their lifetimes hinge on nanoparticle stability; ex‑solution synthesis, which selectively grows fine, uniformly distributed metal nanocatalysts on oxide supports during partial reduction, offers exceptional robustness and is a game‑changer in the field. This review highlights recent research on the origin and mechanism of ex‑solution and proposes future directions to broaden its utility and functionality. The review examines the mechanism underpinning ex‑solution particle formation, detailing how partial reduction drives selective growth of fine, uniformly distributed metal nanocatalysts on oxide supports.

Abstract

Supported metal catalysts represent one of the major milestones in heterogeneous catalysis. Such catalytic systems are feasible for use in a broad range of applications, including renewable energy devices, sensors, automotive emission control systems, and chemical reformers. The lifetimes of these catalytic platforms depend strongly on the stability of the supported nanoparticles. With this regard, nanoparticles synthesized via ex-solution process emphasize exceptional robustness as they are socketed in the host oxide. Ex-solution refers to a phenomenon which yields selective growth of fine and uniformly distributed metal nanocatalysts on oxide supports upon partial reduction. This type of advanced structural engineering is a game-changer in the field of heterogeneous catalysis with numerous studies showing the benefits of ex-solution process. In this review, we highlight the latest research efforts regarding the origin of the ex-solution phenomenon and the mechanism underpinning particle formation. We also propose research directions to expand the utility and functionality of the current ex-solution techniques.