The electrochemical reduction of oxygen at boron-doped diamond and glassy carbon electrodes: A comparative study in a room-temperature ionic liquid

Sven Ernst; Leigh Aldous; Richard G. Compton

doi:10.1016/j.jelechem.2011.10.004

The electrochemical reduction of oxygen at boron-doped diamond and glassy carbon electrodes: A comparative study in a room-temperature ionic liquid

Sven Ernst, Leigh Aldous, Richard G. Compton

Chemistry

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

31 Citations (Scopus)

Abstract

The reduction of oxygen on boron-doped diamond (BDD) and glassy carbon (GC) electrodes was studied in the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [C2mim][NTf2]. O2 reduction at both electrodes was found to involve the 1e− reduction of oxygen to superoxide. The formation of superoxide was verified by repeating the oxygen reduction on BDD in the presence of benzoic acid, resulting in a shift from the 1e− reduction observed in the absence of benzoic acid to a 2e− reduction yielding the hydroperoxyl anion. The reduction of O2 was found to be quasi-reversible on GC and irreversible on BDD. The significantly slower kinetics observed on the BDD electrode are likely due to the lower electronic density of states in BDD.

Original language	English
Pages (from-to)	108-112
Journal	JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume	663
Issue number	2
DOIs	https://doi.org/10.1016/j.jelechem.2011.10.004
Publication status	Published - 15 Dec 2011

Keywords

Cyclic voltammetry
Oxygen reduction
Superoxide
Boron-doped diamond
Glassy carbon
Ionic liquids

Access to Document

10.1016/j.jelechem.2011.10.004

Cite this

@article{0ec4c69f218749fdb71b12858d15a6c5,

title = "The electrochemical reduction of oxygen at boron-doped diamond and glassy carbon electrodes: A comparative study in a room-temperature ionic liquid",

abstract = "The reduction of oxygen on boron-doped diamond (BDD) and glassy carbon (GC) electrodes was studied in the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [C2mim][NTf2]. O2 reduction at both electrodes was found to involve the 1e− reduction of oxygen to superoxide. The formation of superoxide was verified by repeating the oxygen reduction on BDD in the presence of benzoic acid, resulting in a shift from the 1e− reduction observed in the absence of benzoic acid to a 2e− reduction yielding the hydroperoxyl anion. The reduction of O2 was found to be quasi-reversible on GC and irreversible on BDD. The significantly slower kinetics observed on the BDD electrode are likely due to the lower electronic density of states in BDD.",

keywords = "Cyclic voltammetry, Oxygen reduction, Superoxide, Boron-doped diamond, Glassy carbon, Ionic liquids",

author = "Sven Ernst and Leigh Aldous and Compton, {Richard G.}",

year = "2011",

month = dec,

day = "15",

doi = "10.1016/j.jelechem.2011.10.004",

language = "English",

volume = "663",

pages = "108--112",

journal = "JOURNAL OF ELECTROANALYTICAL CHEMISTRY",

issn = "1572-6657",

publisher = "Elsevier BV",

number = "2",

}

TY - JOUR

T1 - The electrochemical reduction of oxygen at boron-doped diamond and glassy carbon electrodes: A comparative study in a room-temperature ionic liquid

AU - Ernst, Sven

AU - Aldous, Leigh

AU - Compton, Richard G.

PY - 2011/12/15

Y1 - 2011/12/15

N2 - The reduction of oxygen on boron-doped diamond (BDD) and glassy carbon (GC) electrodes was studied in the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [C2mim][NTf2]. O2 reduction at both electrodes was found to involve the 1e− reduction of oxygen to superoxide. The formation of superoxide was verified by repeating the oxygen reduction on BDD in the presence of benzoic acid, resulting in a shift from the 1e− reduction observed in the absence of benzoic acid to a 2e− reduction yielding the hydroperoxyl anion. The reduction of O2 was found to be quasi-reversible on GC and irreversible on BDD. The significantly slower kinetics observed on the BDD electrode are likely due to the lower electronic density of states in BDD.

AB - The reduction of oxygen on boron-doped diamond (BDD) and glassy carbon (GC) electrodes was studied in the ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, [C2mim][NTf2]. O2 reduction at both electrodes was found to involve the 1e− reduction of oxygen to superoxide. The formation of superoxide was verified by repeating the oxygen reduction on BDD in the presence of benzoic acid, resulting in a shift from the 1e− reduction observed in the absence of benzoic acid to a 2e− reduction yielding the hydroperoxyl anion. The reduction of O2 was found to be quasi-reversible on GC and irreversible on BDD. The significantly slower kinetics observed on the BDD electrode are likely due to the lower electronic density of states in BDD.

KW - Cyclic voltammetry

KW - Oxygen reduction

KW - Superoxide

KW - Boron-doped diamond

KW - Glassy carbon

KW - Ionic liquids

U2 - 10.1016/j.jelechem.2011.10.004

DO - 10.1016/j.jelechem.2011.10.004

M3 - Article

SN - 1572-6657

VL - 663

SP - 108

EP - 112

JO - JOURNAL OF ELECTROANALYTICAL CHEMISTRY

JF - JOURNAL OF ELECTROANALYTICAL CHEMISTRY

IS - 2

ER -

The electrochemical reduction of oxygen at boron-doped diamond and glassy carbon electrodes: A comparative study in a room-temperature ionic liquid

Abstract

Keywords

Access to Document

Fingerprint

Cite this