Influence of Halide Ions on Anodic Oxidation of Ethanol on Palladium

Ashok Kumar; Daniel Buttry

doi:10.1007/s12678-015-0298-2

Influence of Halide Ions on Anodic Oxidation of Ethanol on Palladium

Ashok Kumar, Daniel Buttry

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

7 Scopus citations

Abstract

Ethanol oxidation on polycrystalline palladium electrodes in alkaline media was studied in the presence of halide ions. Addition of halide ions decreased the ethanol oxidation peak current monotonically as a function of increasing halide concentration. The extent of poisoning was found to be in the order I⁻ > Br⁻ > Cl⁻. Thus, Cl⁻ ions show appreciable inhibition of ethanol oxidation peak current at [Cl⁻] ~ 10⁻³ M, whereas Br⁻ and I⁻ inhibit ethanol oxidation even at [Br⁻] or [I⁻] ~ 10⁻⁶ M. The potential of the ethanol oxidation peak shifted positive with increasing halide ion concentration. The extent of the shift was found to be in the order I⁻ > Br⁻ > Cl⁻. This study is relevant due to the widespread use of palladium halide complexes in the production of Pd electrocatalysts for ethanol oxidation and other electrocatalytic reactions.

Original language	English (US)
Pages (from-to)	201-206
Number of pages	6
Journal	Electrocatalysis
Volume	7
Issue number	3
DOIs	https://doi.org/10.1007/s12678-015-0298-2
State	Published - May 1 2016

Keywords

Competitive adsorption
Ethanol oxidation
Fuel cell
Halides
Palladium
Surface poisoning

ASJC Scopus subject areas

Electrochemistry

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10.1007/s12678-015-0298-2

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title = "Influence of Halide Ions on Anodic Oxidation of Ethanol on Palladium",

abstract = "Ethanol oxidation on polycrystalline palladium electrodes in alkaline media was studied in the presence of halide ions. Addition of halide ions decreased the ethanol oxidation peak current monotonically as a function of increasing halide concentration. The extent of poisoning was found to be in the order I− > Br− > Cl−. Thus, Cl− ions show appreciable inhibition of ethanol oxidation peak current at [Cl−] ~ 10−3 M, whereas Br− and I− inhibit ethanol oxidation even at [Br−] or [I−] ~ 10−6 M. The potential of the ethanol oxidation peak shifted positive with increasing halide ion concentration. The extent of the shift was found to be in the order I− > Br− > Cl−. This study is relevant due to the widespread use of palladium halide complexes in the production of Pd electrocatalysts for ethanol oxidation and other electrocatalytic reactions.",

keywords = "Competitive adsorption, Ethanol oxidation, Fuel cell, Halides, Palladium, Surface poisoning",

author = "Ashok Kumar and Daniel Buttry",

note = "Funding Information: This material is based upon work supported by the National Science Foundation under grant CHE-0957122. Publisher Copyright: {\textcopyright} 2016, Springer Science+Business Media New York.",

year = "2016",

month = may,

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doi = "10.1007/s12678-015-0298-2",

language = "English (US)",

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pages = "201--206",

journal = "Electrocatalysis",

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publisher = "Springer Publishing Company",

number = "3",

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TY - JOUR

T1 - Influence of Halide Ions on Anodic Oxidation of Ethanol on Palladium

AU - Kumar, Ashok

AU - Buttry, Daniel

PY - 2016/5/1

Y1 - 2016/5/1

N2 - Ethanol oxidation on polycrystalline palladium electrodes in alkaline media was studied in the presence of halide ions. Addition of halide ions decreased the ethanol oxidation peak current monotonically as a function of increasing halide concentration. The extent of poisoning was found to be in the order I− > Br− > Cl−. Thus, Cl− ions show appreciable inhibition of ethanol oxidation peak current at [Cl−] ~ 10−3 M, whereas Br− and I− inhibit ethanol oxidation even at [Br−] or [I−] ~ 10−6 M. The potential of the ethanol oxidation peak shifted positive with increasing halide ion concentration. The extent of the shift was found to be in the order I− > Br− > Cl−. This study is relevant due to the widespread use of palladium halide complexes in the production of Pd electrocatalysts for ethanol oxidation and other electrocatalytic reactions.

AB - Ethanol oxidation on polycrystalline palladium electrodes in alkaline media was studied in the presence of halide ions. Addition of halide ions decreased the ethanol oxidation peak current monotonically as a function of increasing halide concentration. The extent of poisoning was found to be in the order I− > Br− > Cl−. Thus, Cl− ions show appreciable inhibition of ethanol oxidation peak current at [Cl−] ~ 10−3 M, whereas Br− and I− inhibit ethanol oxidation even at [Br−] or [I−] ~ 10−6 M. The potential of the ethanol oxidation peak shifted positive with increasing halide ion concentration. The extent of the shift was found to be in the order I− > Br− > Cl−. This study is relevant due to the widespread use of palladium halide complexes in the production of Pd electrocatalysts for ethanol oxidation and other electrocatalytic reactions.

KW - Competitive adsorption

KW - Ethanol oxidation

KW - Fuel cell

KW - Halides

KW - Palladium

KW - Surface poisoning

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JO - Electrocatalysis

JF - Electrocatalysis

IS - 3

ER -

Influence of Halide Ions on Anodic Oxidation of Ethanol on Palladium

Abstract

Keywords

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