Confining Bismuth‐Halide Perovskite in Mesochannels of Silica Nanomembranes for Exceptional Photocatalytic Abatement of Air Pollutants
Jingling Yang, Bin Liu, Lixi Zeng, Bibai Du, Yingtang Zhou, Hengcong Tao, Yang Yun, Mingshan Zhu
Abstract
Abstract Spatially confined photocatalysis has emerged as a viable strategy for the intensification of various redox reactions, but the influence of confined structure on reaction behavior is always overlooked in gas‐solid reactions. Herein, we report a nanomembrane with confining Cs 3 Bi 2 Br 9 nanocrystals inside vertical channels of porous insulated silica thin sheets (CBB@SBA(⊥)) for photocatalytic nitric oxide (NO) abatement. The ordered one‐dimensional (1D) pore channels with mere 70 nm channel length provide a highly accessible confined space for catalytic reactions. A record‐breaking NO conversion efficiency of 98.2 % under a weight hourly space velocity (WHSV) of 3.0×10 6 mL g −1 h −1 , as well as exceptionally high stability over 14 h and durability over a wide humidity range (RH=15–90 %) was realized over SBA(⊥) confined Cs 3 Bi 2 Br 9 , well beyond its nonconfined analogue and the Cs 3 Bi 2 Br 9 confine in Santa Barbara Amorphous (SBA‐15). Mechanism studies suggested that the insulated pore channels of SBA(⊥) in CBB@SBA(⊥) endow concentrated electron field and enhanced mass transfer that render high exposure of reactive species and lower reaction barrier needs for ⋅O 2 − formation and NO oxidation, as well as prevents structural degradation of Cs 3 Bi 2 Br 9 . This work expands an innovative strategy for designing efficient photocatalysts for air pollution remediation.