Stabilized High-Membered and Phase-Pure 2D All Inorganic Ruddlesden–Popper Halide Perovskites Nanocrystals as Photocatalysts for the CO2 Reduction Reaction
Journal
Small
Journal Volume
18
Journal Issue
19
Date Issued
2022
Author(s)
Lin C.-C
Li J.-Y
She N.-Z
Huang S.-K
Huang C.-Y
Wang I.-T
Tsai F.-L
Wei C.-Y
Lee T.-Y
Wang D.-Y
Wen C.-Y
Li S.-S
Yabushita A
Luo C.-W
Chen C.-C
Abstract
In contrast to the 2D organic-inorganic hybrid Ruddlesden–Popper halide perovskites (RPP), a new class of 2D all inorganic RPP (IRPP) has been recently proposed by substituting the organic spacers with an optimal inorganic alternative of cesium cations (Cs+). Nevertheless, the synthesis of high-membered 2D IRPPs (n > 1) has been a very challenging task because the Cs+ need to act as both spacers and A-site cations simultaneously. This work presents the successful synthesis of stable phase-pure high-membered 2D IRPPs of Csn+1PbnBr3n+1 nanosheets (NSs) with n = 3 and 4 by employing the strategy of using additional strong binding bidentate ligands. The structures of the 2D IRPPs (n = 3 and 4) NSs are confirmed by powder X-ray diffraction and high-resolution aberration-corrected scanning transmission electron microscope measurements. These 2D IRPPs NSs exhibit a strong quantum confinement effect with tunable absorption and emission in the visible light range by varying their n values, attributed to their inherent 2D quantum-well structure. The superior structural and optical stability of the phase-pure high-membered 2D IRPPs make them a promising candidate as photocatalysts in CO2 reduction reactions with outstanding photocatalytic performance and long-term stability. © 2022 Wiley-VCH GmbH.
Subjects
2D all-inorganic perovskites; CO 2 reduction; high-membered perovskites; quantum well structure; Ruddlesden–Popper phases
SDGs
Other Subjects
Carbon dioxide; Chelation; Lead compounds; Ligands; Niobium compounds; organic-inorganic materials; Positive ions; Semiconductor quantum wells; Transmission electron microscopy; 2d all-inorganic perovskite; CO 2 reduction; Halide perovskites; High-membered perovskite; Inorganics; Phase pure; Quantum well structures; Reduction reaction; Ruddlesden-Popper; Ruddlesden-Popper phase; Perovskite
Type
journal article