Structure evolution of single-site Pt in a metal-organic framework

Heterogeneous single-metal-site catalyst or single-atom catalyst research has grown rapidly due to the accessibility of modern characterization techniques that can provide invaluable information at the atomic-scale. Herein, we study the structural evolution of isolated single Pt sites incorporated in a metal-organic framework containing bipyridine functional groups using in situ diffuse reflectance infrared Fourier transform spectroscopy with CO as the probe molecule. The structure and electronic properties of the isolated Pt sites are further corroborated by x-ray photoelectron spectroscopy and aberration-corrected scanning transmission electron microscopy. We find the prerequisite of high temperature He treatment for Pt activation and CO insertion and inquire into the structural transformation of Pt site process by dynamic nuclear polarization-enhanced solid-state nuclear magnetic resonance spectroscopy.

Automated summary

The research on heterogeneous single-metal-site catalysts or single-atom catalysts has rapidly expanded thanks to modern characterization techniques providing valuable atomic-scale information. This study investigates the structural evolution and electronic properties of isolated single Pt sites in a metal-organic framework, highlighting the necessity of high temperature He treatment and CO insertion for Pt activation, as well as exploring the structural transformation of Pt sites through dynamic nuclear polarization-enhanced solid-state nuclear magnetic resonance spectroscopy.