Extremely high photocatalytic H2 evolution of novel Co3O4/Cd0.9Zn0.1S p–n heterojunction photocatalyst under visible light irradiation
Yanling Han, Zhibin Liang, Haifeng Dang, Xinfa Dong
文献索引：10.1016/j.jtice.2018.03.035
全文：HTML全文
摘要
The transfer and separation of charge carriers in space are vital for photocatalytic water splitting toward the H2 evolution when the semiconductor photocatalyst is excited with solar light. Herein, a novel Co3O4/Cd0.9Zn0.1S p–n heterojunction composite was successfully prepared through facile solvothermal method. The extremely high H2 evolution (139.78 mmol/g/h) over Co3O4/Cd0.9Zn0.1S-2 without any noble metal co-catalyst was obtained under visible light irradiation (λ ≥ 420 nm), which was 15.88 times higher than that obtained over the bare Cd0.9Zn0.1S and the apparent quantum efficiency (AQE) reached up to 23.21% (λ = 420 nm). The characterization results demonstrated that the existence of p–n heterojunction at the contact interface of p-Co3O4 and n-Cd0.9Zn0.1S as well as the incremental photo-absorption were the origin of the outstanding photocatalytic activity.