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Influence of pH and supporting electrolyte on electrochemical reduction of CO2 using nickel(II) macrocyclic complex of 1, 3, 6, 9, 11, 14 - Hexaazacyclohexadecane as catalyst at HMDE
Balasubramanian Viswanathan
Published in
2002
Volume: 41
   
Issue: 3
Pages: 472 - 477
Abstract
Electrochemical studies on the title compound using cyclic voltammogram (CV) and control potential electrolysis (CPE) techniques reveal that it reduces CO2 electrocatalytically at -1.36V/SCE at hanging mercury drop electrode (HMDE) in aqueous medium using LiClO4 as a supporting electrolyte. The products are found to be CO and H2 in 3:2 mole ratio in the gaseous phase as detected using gas chromatography (GC) and trace amounts of formic acid in solution phase as detected using colorimetric technique. The Ik/Id values (where Ik is the kinetic current measured in the presence of CO2 and Id is the diffusion current measured in N2 atmosphere) observed at various pH values show that pH 5.0 is best suited for CO2 reduction. In addition, the hydrophobicity/hydrophilicity near the electrode surface provided by the cation of the supporting salt and its influence on CO2 reduction is discussed.
About the journal
JournalIndian Journal of Chemistry - Section A Inorganic, Physical, Theoretical and Analytical Chemistry
ISSN03764710
Open AccessNo
Concepts (26)
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    Carbon dioxide
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    Electrolyte
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    Formic acid
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    HEXAAZACYCLOHEXADECANE
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    Hexadecane
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    Mercury
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    Nickel complex
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    Unclassified drug
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    Article
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    Catalyst
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    Chemical reaction kinetics
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    Colorimetry
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    Complex formation
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    Cyclic potentiometry
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    Electrochemical analysis
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    Electrode
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    Electrolysis
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    Gas chromatography
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    Hydrophilicity
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    Hydrophobicity
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    Macromolecule
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    Measurement
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    pH
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    Reduction
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    Surface property
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    Technique