Stable Lead-Free (CH3NH3)(3)Bi2I9 Perovskite for Photocatalytic Hydrogen Generation

摘要

Lead-halide perovskites have demonstrated promising performance in the field of photocatalytic hydrogen production. However, the toxicity of lead hinders their application. Herein, an environmentally friendly and lead-free perovskite (CH3NH3)(3)Bi2I9 was prepared by employing a simple and efficient hydrothermal route. It is found that (CH3NH3)(3)Bi2I9 exhibits excellent phase stability in hydriodic acid with different concentrations. Under visible light irradiation, it showed satisfactory cycle stability after 70 h of repeated H-2 evolution without any degradation or oxidization. After using platinum as a cocatalyst, the photocatalytic rate for H-2 evolution is about 169.21 mu mol g(-1) h(-1), resulting in 14 times enhancement compared with the pristine one (about 12.19 mu mol g(-1) H-1 with 40 mg initial amount) and a solar-to-chemical conversion efficiency of 0.48%. Our research opens new possibilities for the application of lead-free perovskites in the field of photocatalysis.