Controlled nanostructures exhibit interesting optical, electrical and physicochemical properties. Additionally, they can be obtained with well-defined features such as composition, structure, shape and size, that are very important for many applications, including catalysis/electrocatalysis. Aiming at achieving desired properties, controlled nanomaterials enable one not only to optimize the electrocatalytic activity of the materials but also to get a precise correlation between the physicochemical properties and the redox reactions involved in electrocatalytic processes. In this context, the study of stability is crucial for the potential practical applications of these materials. This project focuses on the study the activity and stability of controlled nanostructures based on Pt and/or Pd, supported or not in carbonaceous materials, by electrochemical accelerated stress testing (AST) using rotating disk electrode (RDE) with the monitoring of metals dissolution conducted by the ICP-MS technique. Furthermore, localized electron microscopy analysis of the samples, before and after AST, will be performed to detect possible agglomeration and/or sintering processes of particles resulting from degradation, as well as changes in shape. Thus, this project will allow us to correlate changes in the composition and structure of materials with their activity and durability during electrocatalytic processes.
News published in Agência FAPESP Newsletter about the scholarship: