One-step construction of BiOBr@H3PW12O40@BiOI heterostructure: Conducting photogenerated electrons through W 5d electron bridge for enhancing the photocatalytic activity

In this paper, BiOBr@H 3 PW 12 O 40 @BiOI heterostructure with honeycomb-like morphology is successfully constructed for the first time by a simple one-step solvothermal strategy. The introduction of H 3 PW 12 O 40 effectively improves the specific surface area and photon trapping ability of BiOBr@BiOI heterostructure. More importantly, the W 5d electron orbital of H 3 PW 12 O 40 , as an electron bridge, effectively improves the transmission efficiency of photogenerated electrons in the BiOBr@BiOI heterostructure, thus making the BiOBr@H 3 PW 12 O 40 @BiOI heterostructure show excellent performance in the photocatalytic oxidation or reduction reaction. Based on the macro-thermodynamic model proposed in our previous work and the active species capture experiments, the photocatalytic oxidation or reduction mechanism by using as-prepared BiOBr@H 3 PW 12 O 40 @BiOI heterostructure is discussed in detail.