Novel dual heterojunction between MoS 2 and anatase TiO 2 with coexposed {101} and {001} facets

Abstract This work prepared an anatase TiO 2 by controlling coexposed {101} and {001} facets. The anatase TiO 2 was composited with MoS 2 , and the photocatalytic behavior was studied. The relationship between the exposed ratio of {001} facets and the enhancement proportion by the composite was compared. An appropriate exposed ratio of {001} facets, instead of a high ratio, can cause the highest enhancement proportion for photocatalytic activity. This finding confirmed that exposed {001} facets are not the main factors for improving photocatalytic activity. Dual heterojunction was observed to form between MoS 2 and anatase TiO 2 with coexposed {101} and {001} facets, which is a crystal‐face heterojunction between {101} and {001} facets and a semiconductor heterojunction between MoS 2 and {001} facets of TiO 2 . In this dual heterojunction, photo‐induced electrons in TiO 2 will flow into {101} facets of TiO 2 , instead of MoS 2 , whereas the photo‐induced holes in TiO 2 will flow into MoS 2 to reach a high separation efficiency. This finding further revealed the elevating mechanism of constructing heterojunction based on coexposed crystal faces.