Semiconductor/Covalent-Organic-Framework Z-Scheme Heterojunctions for Artificial Photosynthesis.
Angew Chem Int Ed Engl
; 59(16): 6500-6506, 2020 Apr 16.
Article
in En
| MEDLINE
| ID: mdl-31989745
ABSTRACT
A strategy to covalently connect crystalline covalent organic frameworks (COFs) with semiconductors to create stable organic-inorganic Z-scheme heterojunctions for artificial photosynthesis is presented. A series of COF-semiconductor Z-scheme photocatalysts combining water-oxidation semiconductors (TiO2 , Bi2 WO6 , and α-Fe2 O3 ) with CO2 reduction COFs (COF-316/318) was synthesized and exhibited high photocatalytic CO2 -to-CO conversion efficiencies (up to 69.67â
µmol g-1 h-1 ), with H2 O as the electron donor in the gas-solid CO2 reduction, without additional photosensitizers and sacrificial agents. This is the first report of covalently bonded COF/inorganic-semiconductor systems utilizing the Z-scheme applied for artificial photosynthesis. Experiments and calculations confirmed efficient semiconductor-to-COF electron transfer by covalent coupling, resulting in electron accumulation in the cyano/pyridine moieties of the COF for CO2 reduction and holes in the semiconductor for H2 O oxidation, thus mimicking natural photosynthesis.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Angew Chem Int Ed Engl
Year:
2020
Document type:
Article
Affiliation country:
China