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Carbon supported and Nafion stabilized copper (II) based 1D coordination polymer as an electrocatalyst for oxygen reduction reaction
Yashwant Pratap Kharwar,
Published in Electrochemical Society Inc.
2019
Volume: 166
   
Issue: 7
Pages: F3193 - F3201
Abstract
A Cu-based 1D coordination polymer (Cu-1D-CP), [Cu3(bpy)3(μ-OH)2(μ-CO3)2]n has been synthesized and examined for its oxygen reduction reaction (ORR) activity in O2 saturated 0.1 M KOH medium. Single crystal XRD study indicated the presence of two different Cu centers, mononuclear and binuclear, in Cu-1D-CP. Cu-1D-CP was supported on Ketjenblack carbon (Cu-1D-CP/C) to impart required electronically conducting path up to the Cu-active centers. Immobilization of mononuclear and binuclear sites was achieved by coating Cu-1D-CP/C layer with Nafion ionomer. Based on cyclic voltammetry and density functional theory, it was inferred that carbon and mononuclear-Cu center to facilitate 2-electron reduction of O2 into HO2 − and binuclear-Cu centers to facilitate 4-electron reduction of O2. Complete reduction of O2 by the latter is due to efficient overlap of HOMO of the binuclear site with the LUMO of O2 molecule in side-on and bridging modes of O2 adsorption. Even after 500 cycles of CV in O2 saturated 0.1 M KOH electrolyte, the ORR activity of the Cu-1D-CP nearly unaffected indicating presence of stable Cu-active sites under the coulostatic stabilization of Nafion. © The Author(s) 2019.
About the journal
JournalJournal of the Electrochemical Society
PublisherElectrochemical Society Inc.
ISSN00134651
Open AccessYes
Concepts (19)
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    Carbon
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    Coordination reactions
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    Cyclic voltammetry
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    Density functional theory
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    Electrocatalysts
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    Electrolytes
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    Electrolytic reduction
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    Oxygen
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    Potassium hydroxide
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    Single crystals
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    1d coordination polymer
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    BINUCLEAR SITE
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    CONDUCTING PATHS
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    ELECTROCATALYST FOR OXYGEN REDUCTION REACTIONS
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    NAFION IONOMERS
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    ORR ACTIVITIES
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    Oxygen reduction reaction
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    Single crystal xrd
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    Copper compounds