Photoinduced Electrocatalysis on 3D Flexible OsOx Quantum Dots

• Published in: Advanced energy materials 2021-05, Vol.11 (18), p.n/a
• Main Authors: Du, Yuncheng, Xue, Yurui, Zhang, Chao, Liu, Yuxin, Fang, Yan, Xing, Chengyu, He, Feng, Li, Yuliang
• Format: Article
• Language: English
• Subjects: Catalysts; Charge transfer; Chemical synthesis; Electron recombination; Electronic structure; graphdiyne; heterostructures; Hydrogen evolution reactions; hydrogen production; Hydrogen-based energy; Metal oxides; Osmium; Photoelectric effect; Photoelectric emission; photoinduced electrocatalysis; Quantum dots; Sustainable development
• ISSN: 1614-6832; 1614-6840
• DOI: 10.1002/aenm.202100234

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 OsOx 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, OsOx 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 OsOx 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, OsOx QDs/GDY shows unparalleled performance. Highly uniform and dispersed osmium oxide quantum dots grown on graphdiyne (GDY) are realized. The obtained catalyst shows highly active and durable electrocatalytic hydrogen evolution reaction performance under induction. GDY can effectively prevent hole–electron recombination and facilitate the charge transfer for greatly enhanced catalytic activities and stabilities under alkaline conditions.