Details

Autor(en) / Beteiligte

• Ren, Xiaomin
• Li, Chunzhi
• Liu, Jiali
• Li, He
• Bing, Liujie
• Bai, Shiyang
• Xue, Guoyong
• Shen, Yanbin
• Yang, Qihua

Titel

The Fabrication of Pd Single Atoms/Clusters on COF Layers as Co-catalysts for Photocatalytic H 2 Evolution

Ist Teil von

• ACS applied materials & interfaces, 2022-02, Vol.14 (5), p.6885-6893

Ort / Verlag

United States

Erscheinungsjahr

2022

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The particle size of co-catalysts significantly affects the activity of semiconductors in photocatalysis. Herein, we report that the photocatalytic H evolution (PHE) activity of a visible light responsive covalent organic framework (COF) layer supported on SiO nanoparticles was greatly promoted from 47.7 to 85.5 μmol/h by decreasing the particle size of the Pd co-catalyst from 3.3 nm to single atoms/clusters. A PHE rate of 156 mmol g h and apparent quantum efficiency up to 7.3% were achieved with the Pd SAs/Cs co-catalyst. The relationship between the activity of Pd in H dissociation, proton reduction, and PHE rate suggests that the promotion effect of Pd SAs/Cs is mainly attributed to their enhancement in charge separation of COF layers rather than proton reduction. Furthermore, a photoactive film was fabricated and steady production of H was achieved under visible light irradiation and static conditions. The optimization of the particle size of co-catalysts provides an efficient method for enhancing the photocatalytic activity of semiconductors.