Tuning catalytic performance of platinum single atoms by choosing the shape of cerium dioxide supports.

ABSTRACT: The local coordination environment of single atom catalysts (SACs) often determines their catalytic performance. To understand these metal-support interactions, we prepared Pt SACs on cerium dioxide (CeO₂) cubes, octahedra and rods, with well-structured exposed crystal facets. The CeO₂ crystals were characterized by SEM, TEM, pXRD, and N₂ sorption, confirming the shape-selective synthesis, identical bulk structure, and variations in specific surface area, respectively. EPR, XPS, TEM and XANES measurements showed differences in the oxygen vacancy density following the trend rods > octahedra > cubes. AC-HAADF-STEM, XPS and CO-DRIFTS measurements confirmed the presence of only single Pt²⁺ sites, with different surface platinum surface concentrations

SUBMITTER: Laan PCM 

PROVIDER: S-EPMC11322700 | biostudies-literature | 2024 Sep

REPOSITORIES: biostudies-literature