Multidimensional Perovskite for Visible Light Driven Hydrogen Production in Aqueous HI Solution

A simple and efficient method is applied for the preparation of methylammonium lead iodide perovskite (MAPbI₃), which is defined as a three-dimensional (3D) perovskite, and octadecylammonium lead iodide perovskite (OA₂PbI₄), which is defined as a 2D perovskite; meanwhile, multidimensional perovskite (MDP) is based on the two materials mentioned above with a general formula OAxMA₁–xPbI₃ in which x represents the different content of the relative component. It is demonstrated that MDP has a higher charge transfer ability than traditional 3D perovskite and enhanced performance compared to that of 2D perovskite. Finally, it is found that the MDP material can balance good charge transfer and efficient electron–hole separation ability from 2D perovskite and a full visible range absorption ability comes from 3D perovskite. The prepared OA_0.15MA_0.85PbI₃ is studied in visible light driven photocatalytic H2 evolution in aqueous HI solution, resulting in a continuous PHE in 24 h with a rate of 535.9 μmol g^–1 h^–1, which is much higher than the pristine MAPbI₃ with a rate of 276.1 μmol g^–1 h^–1. Moreover, the quantum efficiency of PHE was determined to be 1.67% for OA_0.15MA_0.85PbI₃ under the irradiation at 420 nm.