Lead‐Free Cs3Bi2I9 Perovskite‐Like Material as Efficient Photocatalyst for Improved Hydrogen Evolution in Presence of Platinum Co‐Catalyst

Abstract Herein, we have reported the synthesis of Cs 3 Bi 2 I 9 MHPs using simple protocols and strategies. Further, crystalline nature and phase of the as‐synthesized Cs 3 Bi 2 I 9 MHPs were examined by exploring XRD and XPS methods. The surface morphological properties of Cs 3 Bi 2 I 9 MHPs were determined by SEM study. XPS technique was used to verify the phase purity and elemental composition of Cs 3 Bi 2 I 9 MHPs. Furthermore, we have used as‐synthesized Cs 3 Bi 2 I 9 MHPs as suitable photo‐catalyst for hydrogen evolution reaction. The Cs 3 Bi 2 I 9 MHPs exhibits decent results for H 2 production. However, introduction of Pt co‐catalyst with Cs 3 Bi 2 I 9 MHPs boosted the photo‐catalytic hydrogen generation. The obtained results exhibited the generation of excellent H 2 amount of 301.45 and 1249.25 μmol g −1 using Cs 3 Bi 2 I 9 MHPs and Cs 3 Bi 2 I 9 MHPs+2 mg Pt, respectively. The obtained results exhibits that Cs 3 Bi 2 I 9 MHPs and Cs 3 Bi 2 I 9 MHPs+2 mg Pt possess excellent cyclic stability and can be reuse for further photo‐catalytic H 2 evolution. Cs 3 Bi 2 I 9 MHPs+Pt (2.0 mg) also exhibited excellent H 2 evolution amount and rate in presence of H 3 PO 2 . The obtained results in this study are the important steps towards the H 2 evolution using Cs 3 Bi 2 I 9 MHPs.