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Electrocatalytic Reduction of Carbon Dioxide to Carbon Monoxide by a Polymerized Film of an Alkynyl‐Substituted Rhenium(I) Complex
Author(s) -
Portenkirchner Engelbert,
Gasiorowski Jacek,
Oppelt Kerstin,
Schlager Stefanie,
Schwarzinger Clemens,
Neugebauer Helmut,
Knör Günther,
Sariciftci Niyazi Serdar
Publication year - 2013
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201200904
Subject(s) - cyclic voltammetry , carbon monoxide , rhenium , chemistry , acetonitrile , polymerization , inorganic chemistry , monomer , electrocatalyst , electrolysis , electrochemistry , electrochemical reduction of carbon dioxide , fourier transform infrared spectroscopy , voltammetry , electrode , polymer , organic chemistry , catalysis , chemical engineering , engineering , electrolyte
The alkynyl‐substituted Re I complex [Re(5,5′‐bisphenylethynyl‐2,2′‐bipyridyl)(CO) 3 Cl] was immobilized by electropolymerization onto a Pt‐plate electrode. The polymerized film exhibited electrocatalytic activity for the reduction of CO 2 to CO. Cyclic voltammetry studies and bulk controlled‐potential electrolysis experiments were performed by using a CO 2 ‐saturated acetonitrile solution. The CO 2 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) 3 Cl] in acetonitrile. The polymer formation and its properties were studied by using SEM, AFM, and attenuated total reflectance (ATR) FTIR and UV/Vis spectroscopy.