Inversion of the Photogalvanic Effect of Conductive Polymers by Porphyrin Dopants

Catalysts

Daniil A. Lukyanov¹  Alexey A. Petrov¹  Oleg A. Kopytko¹  Oleg V. Levin¹  Julia V. Novoselova¹  Elena V. Alekseeva¹ 

[1] Institute of Chemistry, Saint Petersburg State University, University Embankment, 7/9, 199034 St. Petersburg, Russia;

关键词: photocurrent;    NiSalen;    porphyrin;    electrodeposition;    photovoltaics;   

DOI  :  10.3390/catal11060729

来源: DOAJ

【 摘 要 】

Conductive polymers are widely used as active and auxiliary materials for organic photovoltaic cells due to their easily tunable properties, high electronic conductivity, and light absorption. Several conductive polymers show the cathodic photogalvanic effect in pristine state. Recently, photoelectrochemical oxygen reduction has been demonstrated for nickel complexes of Salen-type ligands. Herein, we report an unexpected inversion of the photogalvanic effect caused by doping of the NiSalen polymers with anionic porphyrins. The observed effect was studied by means of UV-Vis spectroscopy, cyclic voltammetry and chopped light chronoamperometry. While pristine NiSalens exhibit cathodic photopolarization, doping with porphyrins inverts the polarization. As a result, photoelectrochemical oxidation of the ascorbate proceeds smoothly on the NiSalen electrode doped with zinc porphyrins. The highest photocurrents were observed on NiSalen polymer with o-phenylene imine bridge, doped with anionic zinc porphyrin. Assuming this, porphyrin serves both as a catalytic center for the oxidation of ascorbate and an internal electron donor, facilitating the photoinduced charge transport and anodic depolarization.

【 授权许可】

Unknown