Photoinduced Electrocatalysis on 3D Flexible OsO_x Quantum Dots

Abstract Synthesizing active and durable catalysts for the hydrogen evolution reaction (HER) is of great significance for the development of a sustainable hydrogen economy. In this paper, an OsO_x quantum dot loaded in 3D flexible graphdiyne is reported for photoelectrocatalysis, which shows greatly improved HER activity under light induction. The calculated and experimental results indicate graphdiyne (GDY) is not only used as the hole transfer layer to prevent hole–electron recombination, but can induce charge transfer for more high‐coordination osmium (Os⁴⁺). Upon exposure to a Xe lamp, OsO_x QDs/GDY shows greatly enhanced catalytic activities and stabilities under alkaline conditions. Significantly, GDY can promote the good distribution and stability of metal oxide quantum dots. The fundamental advantage of the OsO_x QDs/GDY catalyst is to promote hole transport and generate a large number of active sites and its superior photocurrent performance and photo/electrocatalytic activity. Simultaneously, due to the unique properties of the internal electronic structure of the GDY, the Mott‐Schottky effect is promoted efficiently and as a typical semiconductor catalyst, OsO_x QDs/GDY shows unparalleled performance.