Sulfurized Ru constructed enhanced carrier separation heterojunction RuS2/Bi2WO6 for high-efficiency photocatalytic hydrogen evolution

Abstract

In this paper, a new type of heterojunction photocatalyst RuS2/Bi2WO6 was prepared. The H2 yield of the RuS2/Bi2WO6 sample is up to 18.72 mmolg−1 after 4 h, which is almost five times of Bi2WO6 (4.51 mmolg−1). The structure and performance were analyzed by XRD, SEM, XPS, PL and photocatalytic experiments. It was found that the RuS2/Bi2WO6 heterojunction can not only accelerate the separation and transfer of photogenerated carriers, but also broaden their absorption band. The low-cost Ru is sulfurized to form a heterojunction with Bi2WO6, which offers a new perspective for synthesizing photocatalysts, and improves the capability of hydrogen evolution.

Keywords

• Bi2WO6
• Heterojunction
• RuS2
• Platinum metals
• Metal sulfides
• Photocatalytic activity