Ultrathin Holey Pt–M Alloy Nanosheets via Sequential Kinetic–Thermodynamic Metal Reduction Control

Abstract

Ultrathin two-dimensional (2D) metal nanosheets have attracted significant attention in the field of electrocatalysis. Herein, we present a rational synthetic approach mediated by sequential kinetic−thermodynamic metal reduction control for holey ultrathin Pt 3 M alloy nanosheets (Pt 3 M HU-NSs, where M = Ni, Co, Cu, Ir, Pd, Ru, Rh, Fe, or Mn) with a thickness of approximately 3 nm and abundant edge sites. The unique sequential kinetic−thermodynamic metal reduction control provides fine-tuning over the anisotropic 2D growth of Ptbased alloy nanostructures by restraining the three-dimensional growth of metals and stabilizing low-coordinated edge sites. The Pt 3 Ni HU-NSs display significantly enhanced oxygen reduction reaction activity and stability compared to other Pt 3 M HU-NSs, pure Pt HU-NSs, and state-of-the-art Pt/C catalysts, attributed to their distinctive morphology and composition. We believe that this synthesis strategy provides insights into the development of ultrathin 2D metal alloy structures with abundant edge sites that can be deployed to create advanced electrocatalysts.

Construction of Ultrathin CuAuAg Nanosheet-Assembled Three-Dimensional Nanoflowers for Photothermal Conversion and Electrocatalytic Hydrogen Evolution

“…Furthermore, the in-plane pores and cavities promote multiple reflections of incident light, thereby boosting energy utilization efficiency . In terms of HER, the in-plane porous nanosheets assembled into a nanoflower architecture are characterized by nanoscale porosity and two-dimensional nanosheets. − These features contribute to an ultrahigh specific surface area, which increases the ratio of exposed atoms and enhances the diffusion and transmission of intermediates during the reaction, thereby benefiting the catalytic process …”