The Local Changes in the Physicochemical Properties during Electrode Reactions in a Chlorocuprate Ionic Liquid

Nobuyuki Serizawa; Suguru Kuwahara; Xiaoyi Li; Yasushi Katayama

doi:10.1149/1945-7111/adca07

The Local Changes in the Physicochemical Properties during Electrode Reactions in a Chlorocuprate Ionic Liquid

Nobuyuki Serizawa, Suguru Kuwahara, Xiaoyi Li, Yasushi Katayama

Department of Applied Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

The physicochemical and electrochemical properties of an ionic liquid consisting of the dichlorocuprate anion, [CuCl₂]^-, were investigated. The equimolar mixture of CuCl and 1-butyl-1-methylpyrrolidinium chloride (BMPCl) was found to yield an ionic liquid at 298 K composed predominantly of BMP⁺ and [CuCl₂]^-. Fine deposits of metallic Cu were obtained on a glassy carbon electrode by potentiostatic and galvanostatic reduction of [CuCl₂]^- in CuCl-BMPCl (50.0-50.0 mol%). The overpotential for Cu nucleation was larger on a glassy carbon electrode than on a Pt electrode. The electrochemical deposition and dissolution of Cu were analyzed using an electrochemical quartz crystal microbalance. The local viscosity and density of the electrolyte near the electrode/electrolyte interface increased during both deposition and dissolution of Cu, probably reflecting the shift in the electrolyte composition to the local basic and acidic conditions, respectively.

Original language	English
Article number	046504
Journal	Journal of the Electrochemical Society
Volume	172
Issue number	4
DOIs	https://doi.org/10.1149/1945-7111/adca07
Publication status	Published - 2025 Apr 1

Keywords

anodic dissolution
coordination structure
electrodepisition - copper
electrorefining
interface
molten salts - low temperature molten salts

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Renewable Energy, Sustainability and the Environment
Condensed Matter Physics
Surfaces, Coatings and Films
Electrochemistry
Materials Chemistry

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1149/1945-7111/adca07

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title = "The Local Changes in the Physicochemical Properties during Electrode Reactions in a Chlorocuprate Ionic Liquid",

abstract = "The physicochemical and electrochemical properties of an ionic liquid consisting of the dichlorocuprate anion, [CuCl2]-, were investigated. The equimolar mixture of CuCl and 1-butyl-1-methylpyrrolidinium chloride (BMPCl) was found to yield an ionic liquid at 298 K composed predominantly of BMP+ and [CuCl2]-. Fine deposits of metallic Cu were obtained on a glassy carbon electrode by potentiostatic and galvanostatic reduction of [CuCl2]- in CuCl-BMPCl (50.0-50.0 mol%). The overpotential for Cu nucleation was larger on a glassy carbon electrode than on a Pt electrode. The electrochemical deposition and dissolution of Cu were analyzed using an electrochemical quartz crystal microbalance. The local viscosity and density of the electrolyte near the electrode/electrolyte interface increased during both deposition and dissolution of Cu, probably reflecting the shift in the electrolyte composition to the local basic and acidic conditions, respectively.",

keywords = "anodic dissolution, coordination structure, electrodepisition - copper, electrorefining, interface, molten salts - low temperature molten salts",

author = "Nobuyuki Serizawa and Suguru Kuwahara and Xiaoyi Li and Yasushi Katayama",

note = "Publisher Copyright: {\textcopyright} 2025 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited.",

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doi = "10.1149/1945-7111/adca07",

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AU - Serizawa, Nobuyuki

AU - Kuwahara, Suguru

AU - Li, Xiaoyi

AU - Katayama, Yasushi

PY - 2025/4/1

Y1 - 2025/4/1

N2 - The physicochemical and electrochemical properties of an ionic liquid consisting of the dichlorocuprate anion, [CuCl2]-, were investigated. The equimolar mixture of CuCl and 1-butyl-1-methylpyrrolidinium chloride (BMPCl) was found to yield an ionic liquid at 298 K composed predominantly of BMP+ and [CuCl2]-. Fine deposits of metallic Cu were obtained on a glassy carbon electrode by potentiostatic and galvanostatic reduction of [CuCl2]- in CuCl-BMPCl (50.0-50.0 mol%). The overpotential for Cu nucleation was larger on a glassy carbon electrode than on a Pt electrode. The electrochemical deposition and dissolution of Cu were analyzed using an electrochemical quartz crystal microbalance. The local viscosity and density of the electrolyte near the electrode/electrolyte interface increased during both deposition and dissolution of Cu, probably reflecting the shift in the electrolyte composition to the local basic and acidic conditions, respectively.

AB - The physicochemical and electrochemical properties of an ionic liquid consisting of the dichlorocuprate anion, [CuCl2]-, were investigated. The equimolar mixture of CuCl and 1-butyl-1-methylpyrrolidinium chloride (BMPCl) was found to yield an ionic liquid at 298 K composed predominantly of BMP+ and [CuCl2]-. Fine deposits of metallic Cu were obtained on a glassy carbon electrode by potentiostatic and galvanostatic reduction of [CuCl2]- in CuCl-BMPCl (50.0-50.0 mol%). The overpotential for Cu nucleation was larger on a glassy carbon electrode than on a Pt electrode. The electrochemical deposition and dissolution of Cu were analyzed using an electrochemical quartz crystal microbalance. The local viscosity and density of the electrolyte near the electrode/electrolyte interface increased during both deposition and dissolution of Cu, probably reflecting the shift in the electrolyte composition to the local basic and acidic conditions, respectively.

KW - anodic dissolution

KW - coordination structure

KW - electrodepisition - copper

KW - electrorefining

KW - interface

KW - molten salts - low temperature molten salts

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JO - Journal of the Electrochemical Society

JF - Journal of the Electrochemical Society

IS - 4

M1 - 046504

ER -

The Local Changes in the Physicochemical Properties during Electrode Reactions in a Chlorocuprate Ionic Liquid

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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