Improved Plasmonic Hot-Electron Capture in Au Nanoparticle/Polymeric Carbon Nitride by Pt Single Atoms for Broad-Spectrum Photocatalytic H2 Evolution

A hybrid co-catalysts system comprising Au nanoparticles (NPs) and PtSAs with different functions was constructed on the polymeric carbon nitride (PCN) surface by double-solvent method. For the dual co-catalysts, the Au NPs absorb relatively long-wavelength light to produce plasmonic hot-electrons, and the adjacent Pt single atoms (PtSAs) can trap the plasmonic hot-electrons effectively for H 2 evolution. The PtSAs–Au 2.5 /PCN exhibits excellent broad-spectrum photocatalytic H 2 evolution activity with the H 2 evolution rate of 8.8 mmol g − 1 h − 1 at 420 nm and 264 μmol g − 1 h − 1 at 550 nm, respectively.