The core-shell catalysts with atomic layered surface Pt through liquid phase atomic layer deposition has been proven to be one of the most promising ORR catalysts with high activity and low consume of Pt. However, corrosion is a major and unavoidable challenge for the degradation of properties of catalysts during electrocatalysis, which restricts the practical application of catalysts severely. Therefore, it has been an urgent issue to understand the evolution and mechanism of both atomic layer formation and corrosion of Pt based atomic layered core-shell catalysts during the reaction with an aim to the effective utilization of the catalysts. In this presentation, we will first report a new 3D growth mechansim for the formation of core−shell nanostructures involving a hybrid process with: initial island growth, surface diffusion, and subsequent layer growth. The apparent layer-by-layer growth is a dynamic process by balancing both island deposition and surface diffusion. Secondly, the in situ study of corrosion behavoir of Pt based atomic layer core-shell catalysts will be carried out via liquid phase in situ TEM technique to demonstrate the direct relationship between the dynamical evolution of structures and compositions of ORR catalysts. This in situ study of hybrid growth and corrsion mechanism of Pt based atomic layered core-shell catalysts provide valuable insight and fundamental understanding to design highly acitve and durable electrocatalysts.

In situ investigation of nucleation, growth, and corrosion behaviors of core-shell electocatalysts

256th National Meeting (2018)

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