Restructuring dynamics of surface species in bimetallic nanoparticles probed by modulation excitation spectroscopy.

ABSTRACT: Restructuring of metal components on bimetallic nanoparticle surfaces in response to the changes in reactive environment is a ubiquitous phenomenon whose potential for the design of tunable catalysts is underexplored. The main challenge is the lack of knowledge of the structure, composition, and evolution of species on the nanoparticle surfaces during reaction. We apply a modulation excitation approach to the X-ray absorption spectroscopy of the 30 atomic % Pd in Au supported nanocatalysts via the gas (H₂ and O₂) concentration modulation. For interpreting restructuring kinetics, we correlate the phase-sensitive detection with the time-domain analysis aided by a denoising algorithm. Here we show that the surface and near-surface species such as Pd oxides and atomically

SUBMITTER: Routh PK 

PROVIDER: S-EPMC11306641 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature