Electrochimica Acta [LECPCS]

Abstract:

 

Four hybrid polyoxometalate–porphyrin copolymer films were obtained by the electrooxidation of zinc-β-octaethylporphyrin (ZnOEP) or 5,15-ditolylporphyrin (H₂T₂P) in the presence of organosilyl functionalized Keggin-type POMs TBA₃[PW₁₁Si₂O₄₀C₂₆H₁₆N₂] (abbreviated Py-PW₁₁Si₂-Py) and Dawson-type POMs TBA₆[P₂W₁₇Si₂O₆₂C₂₆H₁₆N₂] (abbreviated Py-P₂W₁₇Si₂-Py) bearing two remote pyridyl groups. The electropolymerization process of the four copolymers was monitored by EQCM. The obtained copolymers were characterized by UV/Vis spectroscopy, X-ray photoelectron spectroscopy, electrochemistry, and AFM. Their impedance properties (EIS) were studied and their photovoltaic performances were also investigated by photocurrent transient measurements under visible light irradiation. These studies showed a correlation between impedance and photovoltaic performances, the films based on Dawson type POMs and Zn porphyrins giving the best results. This last system displayed one of the best photocurrent efficiency for a reported POM photosensitized hybrid.

Graphical Abstract :

 

Reference :

Photocurrent Generation from Visible Light Irradiation of Covalent Polyoxometalate-Porphyrin Copolymers

Zhaohui Huo, Yiming Liang, Shu Yang, Dejin Zang,  Rana Farha, Michel Goldmann, Hualong Xu, Bonnefont Antoine,  Edoardo Matricardi, Guillaume Izzet, Anna Proust, and Laurent Ruhlmann

Electrochimica Acta, 2021, 368, 137635 - DOI: https://doi.org/10.1016/j.electacta.2020.137635

Contacts :

A. Bonnefont and L. Ruhlmann, équipe LECPCS, Institut de Chimie (UMR 7177).