Probing TCNQ-Mediated Metal Reduction Reactions at Liquid-Liquid Interface with SECM

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Metal reduction at the interface between two immiscible electrolyte solutions
(ITIES) is studied with scanning electrochemical microscopy (SECM). Metal cations in the aqueous phase are reduced by 7,7,8,8-tetracyanoquinodimethane
anion (TCNQ-) residing in the oil phase, methyl isobutyl ketone (MIBK). TCNQ-
is formed at the SECM tip by reducing TCNQ, which results in a positive feedback loop between the tip and the ITIES when an electron is donated to a
metal cation. The effect of the Galvani potential difference on the rate of the
interfacial electron transfer was investigated, establishing the potential difference either by an additional substrate electrode in the aqueous phase or by an a common ion in both phases. It is shown that the Galvani potential difference as a driving force does enable TCNQ- mediated Cu2+ reduction. Finite element method (FEM) simulations were run to provide information on the reaction kinetics and stoichiometry.
Original languageEnglish
JournalELECTROANALYSIS
DOIs
Publication statusE-pub ahead of print - Dec 2019
MoE publication typeA1 Journal article-refereed

Keywords

  • Scanning electrochemical microscope
  • liquid-liquid interface
  • metal reduction
  • Finite element method (FEM)
  • Electrochemistry

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