Ligand-free CsPbBr3 with calliandra-like nanostructure for efficient artificial photosynthesis

A calliandra-like ligand-free CsPbBr3 nanostructure is constructed by a seed-assisted growth method, which exhibits significantly enhanced photocatalytic activity for artificial photosynthesis compared with traditional CsPbBr3 nanocrystals. [Display omitted] The low-efficiency CO2 uptake capacity an...

Full description

Saved in:
Bibliographic Details
Published in:Journal of energy chemistry 2023-02, Vol.77, p.317-325
Main Authors: Mu, Yan-Fei, Liu, Hui-Ling, Zhang, Meng-Ran, Wang, Hong-Juan, Zhang, Min, Lu, Tong-Bu
Format: Article
Language:English
Subjects:
Artificial photosynthesis
Charge separation
Halide perovskite
Ligand-free
Vacancy defect
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:A calliandra-like ligand-free CsPbBr3 nanostructure is constructed by a seed-assisted growth method, which exhibits significantly enhanced photocatalytic activity for artificial photosynthesis compared with traditional CsPbBr3 nanocrystals. [Display omitted] The low-efficiency CO2 uptake capacity and insufficient photogenerated exciton dissociation of current metal halide perovskite (MHP) nanocrystals with end-capping ligands extremely restrict their application in the field of artificial photosynthesis. Herein, we demonstrate that ligand-free CsPbBr3 with calliandra-like nanostructure (LF-CPB CL) can be synthesized easily through a ligand-free seed-assisted dissolution-recrystallization growth process, exhibiting significantly enhanced CO2 uptake capacity. More specifically, the abundant surface bromine (Br) vacancies in ligand-free MHP materials are demonstrated to be beneficial to photogenerated carrier separation. The electron consumption rate of LF-CPB CL for photocatalytic CO2 reduction increases 7 and 20 times over those of traditional ligand-capping CsPbBr3 nanocrystal (L-CPB NC) and bulk CsPbBr3, respectively. Moreover, the absence of ligand hindrance can facilitate the interfacial electronic coupling between LF-CPB CL and tetra(4-carboxyphenyl)porphyrin iron(III) chloride (Fe-TCPP) cocatalyst, bringing forth significantly accelerated interfacial charge separation. The LF-CPB CL/Fe-TCPP exhibits a total electron consumption rate of 145.6 μmol g−1 h−1 for CO2 photoreduction coupled with water oxidation, which is over 14 times higher than that of L-CPB NC/Fe-TCPP.
ISSN:2095-4956
DOI:10.1016/j.jechem.2022.10.022