Enhanced Photocatalytic Activity of BiVO4/Bi2S3/SnS2 Heterojunction under Visible Light

Catalysts

Sopheak Meng¹  KeiichiN. Ishihara¹  Takaya Ogawa¹  Hideyuki Okumura¹ 

[1] Graduate School of Energy Science, Kyoto University, Kyoto 606-8501, Japan;

关键词: BiVO₄/Bi₂S₃/SnS₂ heterojunction;    visible light;    Z-scheme;   

DOI  :  10.3390/catal10111294

来源: DOAJ

【 摘 要 】

Heterojunction photocatalysts have attracted a significant amount of attention due to their advantages over a single photocatalyst and, particularly, their superior spatial charge separation. Herein, the BiVO₄/Bi₂S₃/SnS₂ heterojunction was synthesized via solvothermal synthesis with different ratios of BiVO₄ to SnS₂. The photodegradation rate of the 0.03 BiVO₄/SnS₂ sample for rhodamine B removal is 2.3 times or 2.9 times greater than that of a single SnS₂ or BiVO₄, respectively. The chemical bond between photocatalysts is confirmed by X-ray photoelectron spectroscopy (XPS), and the synchronized shift observed in binding energies strongly indicates the electron screening effect at the heterojunction. A Z-scheme model is proposed to explain charge transfer pathway in the system, in which the formation of Bi₂S₃ plays a crucial role in the enhanced photocatalytic performance of the heterojunction.

【 授权许可】

Unknown