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Modified electrode surfaces for catalytic reduction of carbon dioxide

Authors
  • Jarz e ̨ bińska, Agnieszka
  • Rowiński, Pawe l ̶
  • Zawisza, Izabella
  • Bilewicz, Renata
  • Siegfried, Liselotte
  • Kaden, Thomas
Type
Published Article
Journal
Analytica Chimica Acta
Publisher
Elsevier
Publication Date
Jan 01, 1999
Accepted Date
Apr 26, 1999
Volume
396
Issue
1
Pages
1–12
Identifiers
DOI: 10.1016/S0003-2670(99)00364-5
Source
Elsevier
Keywords
License
Unknown

Abstract

Ni(II) complexes with substituted tetraazacyclotetradecanes were incorporated into Nafion films or assembled in monolayers on electrodes in order to obtain electrocatalytic systems for the reduction of carbon dioxide. Reproducible and stable loading of the Nafion films with the complexes has been observed. Systematic increase of N-methyl substitution of the catalytic [Ni(cyclam)] 2+ complex leads to a shift of the Ni(II)L/Ni(I)L formal potential to more positive values, however, at the same time to a decrease of the catalytic current of CO 2 reduction. Monolayer techniques — the Langmuir–Blodgett and self-assembly methods — were found advantageous for the preparation of electrode surfaces active in the catalytic reduction of CO 2 compared to Nafion coatings containing the catalyst. Glassy carbon electrode was suitable for the transfer of Langmuir–Blodgett monolayers. Catalysis was observed only when the electrode was touching the monolayer at the air–water interface or was covered in the dipping mode, hence when the catalyst molecules were oriented with their alkyl chains towards the substrate and macrocyclic head-group towards the solution. Most efficient catalysis was found using electrodes coated by the self-assembly procedure with monolayers of the cyclam complex modified with a pyridine side group. The role of the pyridine moieties was to anchor the catalytic monolayer to the electrode surface.

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