Solid-State Synthesis of Lead-Free Perovskite Cs3bi2br9 for Photocatalytic O2-Involved Coupling of Aldehydes or Alcohols to Anhydrides

Abstract

Herein, a green and highly efficient strategy was developed to fabricate lead-free perovskite Cs3Bi2Br9 via a solid-state mechanochemical process under mild conditions, wherein the effects of rotation speed, grinding duration and ball-to-powder ratio on the formation of Cs3Bi2Br9 powers were investigated. Furthermore, the photocatalytic performance of the as-prepared Cs3Bi2Br9 powers was evaluated for catalyzing oxidative coupling of various aldehydes and alcohols to anhydrides in the presence of O2 as the sole oxidant. Meanwhile, detailed reaction mechanism studies were carried out with assistance of various control experiments and analytical techniques.

Keywords: Solid-state mechanochemical synthesis, lead-free perovskite, oxidative coupling, photocatalytic synthesis, anhydrides