Oxygen Reduction Reaction in Room Temperature Protic Ionic Liquids

Asim Khan; Xunyu Lu; Leigh Aldous; Chuan Zhao

doi:10.1021/jp405759j

Oxygen Reduction Reaction in Room Temperature Protic Ionic Liquids

Asim Khan, Xunyu Lu, Leigh Aldous, Chuan Zhao

Chemistry

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62 Citations (Scopus)

Abstract

The oxygen reduction reaction (ORR) has been studied at platinum, gold, and glassy carbon electrodes using cyclic voltammetry and potential-step chronoamperometry in 11 room temperature protic ionic liquids (PILs). The diffusion coefficient and solubility of oxygen in seven PILs were determined by nonlinear curve fitting of potential-step chronoamperometry at a platinum microelectrode. The diffusion coefficient of oxygen in the PILs was consistently on the order of 10–6 cm2 s–1. The ORR in the PILs was found to largely follow an electrochemical–chemical–electrochemical–chemical (ECEC) mechanism, as demonstrated by digital simulation of cyclic voltammograms at platinum, gold, and glassy carbon electrodes. The influence of electrode material on peak potential, heterogeneous rate constant, and transfer coefficient was studied. The influence of temperature on kinetics and thermodynamic properties like activation energy of ORR, activation energy of diffusion, and enthalpy of dissolution of oxygen in ethylammonium nitrate, bis(methoxyethyl)ammonium benzoate, and bis-(methoxyethyl)ammonium sulfamate was also investigated.

Original language	English
Pages (from-to)	18334-18342
Journal	Journal Of Physical Chemistry C
Volume	117
Issue number	36
DOIs	https://doi.org/10.1021/jp405759j
Publication status	Published - 12 Sept 2013

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@article{09a0b9dadc894cc58400ec49fbb1b118,

title = "Oxygen Reduction Reaction in Room Temperature Protic Ionic Liquids",

abstract = "The oxygen reduction reaction (ORR) has been studied at platinum, gold, and glassy carbon electrodes using cyclic voltammetry and potential-step chronoamperometry in 11 room temperature protic ionic liquids (PILs). The diffusion coefficient and solubility of oxygen in seven PILs were determined by nonlinear curve fitting of potential-step chronoamperometry at a platinum microelectrode. The diffusion coefficient of oxygen in the PILs was consistently on the order of 10–6 cm2 s–1. The ORR in the PILs was found to largely follow an electrochemical–chemical–electrochemical–chemical (ECEC) mechanism, as demonstrated by digital simulation of cyclic voltammograms at platinum, gold, and glassy carbon electrodes. The influence of electrode material on peak potential, heterogeneous rate constant, and transfer coefficient was studied. The influence of temperature on kinetics and thermodynamic properties like activation energy of ORR, activation energy of diffusion, and enthalpy of dissolution of oxygen in ethylammonium nitrate, bis(methoxyethyl)ammonium benzoate, and bis-(methoxyethyl)ammonium sulfamate was also investigated.",

author = "Asim Khan and Xunyu Lu and Leigh Aldous and Chuan Zhao",

year = "2013",

month = sep,

day = "12",

doi = "10.1021/jp405759j",

language = "English",

volume = "117",

pages = "18334--18342",

journal = "Journal Of Physical Chemistry C",

issn = "1932-7447",

publisher = "American Chemical Society",

number = "36",

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TY - JOUR

T1 - Oxygen Reduction Reaction in Room Temperature Protic Ionic Liquids

AU - Khan, Asim

AU - Lu, Xunyu

AU - Aldous, Leigh

AU - Zhao, Chuan

PY - 2013/9/12

Y1 - 2013/9/12

N2 - The oxygen reduction reaction (ORR) has been studied at platinum, gold, and glassy carbon electrodes using cyclic voltammetry and potential-step chronoamperometry in 11 room temperature protic ionic liquids (PILs). The diffusion coefficient and solubility of oxygen in seven PILs were determined by nonlinear curve fitting of potential-step chronoamperometry at a platinum microelectrode. The diffusion coefficient of oxygen in the PILs was consistently on the order of 10–6 cm2 s–1. The ORR in the PILs was found to largely follow an electrochemical–chemical–electrochemical–chemical (ECEC) mechanism, as demonstrated by digital simulation of cyclic voltammograms at platinum, gold, and glassy carbon electrodes. The influence of electrode material on peak potential, heterogeneous rate constant, and transfer coefficient was studied. The influence of temperature on kinetics and thermodynamic properties like activation energy of ORR, activation energy of diffusion, and enthalpy of dissolution of oxygen in ethylammonium nitrate, bis(methoxyethyl)ammonium benzoate, and bis-(methoxyethyl)ammonium sulfamate was also investigated.

AB - The oxygen reduction reaction (ORR) has been studied at platinum, gold, and glassy carbon electrodes using cyclic voltammetry and potential-step chronoamperometry in 11 room temperature protic ionic liquids (PILs). The diffusion coefficient and solubility of oxygen in seven PILs were determined by nonlinear curve fitting of potential-step chronoamperometry at a platinum microelectrode. The diffusion coefficient of oxygen in the PILs was consistently on the order of 10–6 cm2 s–1. The ORR in the PILs was found to largely follow an electrochemical–chemical–electrochemical–chemical (ECEC) mechanism, as demonstrated by digital simulation of cyclic voltammograms at platinum, gold, and glassy carbon electrodes. The influence of electrode material on peak potential, heterogeneous rate constant, and transfer coefficient was studied. The influence of temperature on kinetics and thermodynamic properties like activation energy of ORR, activation energy of diffusion, and enthalpy of dissolution of oxygen in ethylammonium nitrate, bis(methoxyethyl)ammonium benzoate, and bis-(methoxyethyl)ammonium sulfamate was also investigated.

U2 - 10.1021/jp405759j

DO - 10.1021/jp405759j

M3 - Article

SN - 1932-7447

VL - 117

SP - 18334

EP - 18342

JO - Journal Of Physical Chemistry C

JF - Journal Of Physical Chemistry C

IS - 36

ER -

Oxygen Reduction Reaction in Room Temperature Protic Ionic Liquids

Abstract

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