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3D electropolymerized thin film based on a thiophene-functionalized Ru(II) complex: electrochemical and photoelectrochemical insights

Abstract

The electropolymerized organic films have been extensively investigated, and are usually of one- or two-dimensional structures, the three-dimensional (3D) electropolymerized thin films are rare. In this work, a new 3D thiophene-functionalized ruthenium complex of RuL3(ClO4)2·5H2O {L = 1-phenyl-2-(5-(thiophen-2-yl)thiophen-2-yl)-1H-imidazo[4,5-f][1,10]phenanthrolin} was synthesized and electro-oxidized toform 3D polymerized poly-RuL3, which was deposited onto indium-tin oxide electrode surface.The resulting films are studied by UV-Vis absorption spectroscopy, scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and cyclic voltammetry and photoelectrochemical measurements. It was found that the 3D polymer films exhibited surface-controlled RuIII / II related redox behavior and cathodic photocurrent generation characteristics. Under the irradiation of 100 mW/cm2 white light, poly-RuL3modified electrodes in 0.1 M Na2SO4 aqueous solution showed photocurrent density of 5.43 μA cm-2 in the absence of added electron acceptor, that was increased to 14.29 μA cm-2 when the oxygen was bubbled into the electrolyte solution, indicating that poly-RuL3 acted as both excellent sensitizer and catalyst for oxygen reduction. This work would guide the construction of modified electrodes with more efficient photoelectric conversion and oxygen sensing and reduction.

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Publication details

The article was received on 13 Jul 2019, accepted on 25 Sep 2019 and first published on 26 Sep 2019


Article type: Research Article
DOI: 10.1039/C9QI00863B
Inorg. Chem. Front., 2019, Accepted Manuscript

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    3D electropolymerized thin film based on a thiophene-functionalized Ru(II) complex: electrochemical and photoelectrochemical insights

    T. Yang, C. Zhang, J. Li, Y. Fu, Z. Yin, L. H. Gao and K. Wang, Inorg. Chem. Front., 2019, Accepted Manuscript , DOI: 10.1039/C9QI00863B

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