• Open Access

Electrocatalytic Reduction of Carbon Dioxide to Carbon Monoxide by a Polymerized Film of an Alkynyl-Substituted Rhenium(I) Complex

Authors

  • Engelbert Portenkirchner,

    Corresponding author
    1. Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz (Austria), Fax: (+43) 732-2468-8770
    • Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz (Austria), Fax: (+43) 732-2468-8770

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  • Jacek Gasiorowski,

    1. Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz (Austria), Fax: (+43) 732-2468-8770
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  • Kerstin Oppelt,

    1. Institute of Inorganic Chemistry, Center for Nanobionics and Photochemical Sciences (CNPS), Johannes Kepler University Linz (Austria)
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  • Stefanie Schlager,

    1. Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz (Austria), Fax: (+43) 732-2468-8770
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  • Dr. Clemens Schwarzinger,

    1. Institute for Chemical Technology of Organic Materials, Johannes Kepler University Linz (Austria)
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  • Dr. Helmut Neugebauer,

    1. Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz (Austria), Fax: (+43) 732-2468-8770
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  • Prof. Günther Knör,

    1. Institute of Inorganic Chemistry, Center for Nanobionics and Photochemical Sciences (CNPS), Johannes Kepler University Linz (Austria)
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  • Prof. Niyazi Serdar Sariciftci

    1. Linz Institute for Organic Solar Cells (LIOS), Institute of Physical Chemistry, Johannes Kepler University Linz (Austria), Fax: (+43) 732-2468-8770
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Abstract

The alkynyl-substituted ReI complex [Re(5,5′-bisphenylethynyl-2,2′-bipyridyl)(CO)3Cl] was immobilized by electropolymerization onto a Pt-plate electrode. The polymerized film exhibited electrocatalytic activity for the reduction of CO2 to CO. Cyclic voltammetry studies and bulk controlled-potential electrolysis experiments were performed by using a CO2-saturated acetonitrile solution. The CO2 reduction, determined by cyclic voltammetry, occurs at approximately −1150 mV versus the normal hydrogen electrode (NHE). Quantitative analysis by GC and IR spectroscopy was used to determine a Faradaic efficiency of approximately 33 % for the formation of CO. Both values of the modified electrode were compared to the performance of the homogenous monomer [Re(5,5′-bisphenylethynyl-2,2′-bipyridyl)(CO)3Cl] in acetonitrile. The polymer formation and its properties were studied by using SEM, AFM, and attenuated total reflectance (ATR) FTIR and UV/Vis spectroscopy.

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