Bionic construction of a dual Z-scheme MoO3/ZnIn2S4/black phosphorus quantum dots heterojunction with expanded redox surfaces and photoelectron transfer ability for high-efficiency photocatalysis

Z-scheme photocatalyst was researched in recent years due to its bionic electron transfer structure, while there were still challenges on amount of electron-hole pairs and preservation of redox ability in above systems. In this work, a new dual Z-scheme MoO 3 /ZnIn 2 S 4 /black phosphorus quantum dots (MZBP) heterojunction was constructed to solve above problems and employed for photocatalytic hydrogen (H 2 ) evolution. According to the results, the H 2 generation efficiency of MZBP reached to 5.45 mmol/g/h under visible light irradiation, which were 10 and 1.6 times higher than that of pure ZnIn 2 S 4 and MoO 3 /ZnIn 2 S 4 (MZ) material, respectively. The apparent quantum yield (AQY) of MZBP was calculated as 13.2% at 420 nm, indicating its high energy conversion property. In general, the enhanced separation ability of photo-induced carriers and large redox surfaces of dual Z-scheme MZBP system played important roles for enhancement of H 2 evolution. According to the high-efficiency H 2 evolution performance and significant dual Z-scheme mechanism, the novel heterojunction was promising for more applications in photoelectric fields.