Atomically precise Au x Ag 25- x nanoclusters with a modulated interstitial Au-Ag microenvironment for enhanced visible-light-driven photocatalytic hydrogen evolution.

Herein, we report the study of atomically precise Au x Ag 25- x nanoclusters (NCs) toward photocatalytic hydrogen evolution. The incorporation of Au atoms into Ag 25 NCs not only narrowed the HOMO-LUMO gaps but also created an interstitial Au-Ag microenvironment, which promoted the photogenerated charge carrier utilization and optimized the reaction dynamics.