Identification of Surface Films Formed on Active Metals and Nonactive Metal Electrodes at Low Potentials in Methyl Formate Solutions

Yair Ein Ely; Doron Aurbach

doi:10.1021/la00043a026

Identification of Surface Films Formed on Active Metals and Nonactive Metal Electrodes at Low Potentials in Methyl Formate Solutions

Yair Ein Ely, Doron Aurbach

Department of Chemistry

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

45 Scopus citations

Abstract

The electrochemical behavior of methyl formate (MF) and MF/CO₂/Li salt solutions with active metals (lithium, calcium) and nonactive metals (nickel, gold) was investigated. The salts included calcium, lithium, and tetrabutylammonium perchlorates and tetrafluoroborates, and LiAsF₆. Surface-sensitive Fourier transform infrared (FTIR) spectroscopy and X-ray microanalysis were used in order to characterize the various electrode surfaces, in addition to cyclic voltammetry. It was found that the metal formates (HCOOLi or (HCOO)₂Ca) are the major surface species formed both on the active and on the nonactive electrodes at potentials below 1.5 V (Li/Li⁺) and that they passivate them. When CO₂ and Li salt are present in MF solutions, films formed on both active and nonactive electrodes at low potentials contain both lithium formate and lithium carbonate.

Original language	English
Pages (from-to)	1845-1850
Number of pages	6
Journal	Langmuir
Volume	8
Issue number	7
DOIs	https://doi.org/10.1021/la00043a026
State	Published - 1 Jul 1992

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title = "Identification of Surface Films Formed on Active Metals and Nonactive Metal Electrodes at Low Potentials in Methyl Formate Solutions",

abstract = "The electrochemical behavior of methyl formate (MF) and MF/CO2/Li salt solutions with active metals (lithium, calcium) and nonactive metals (nickel, gold) was investigated. The salts included calcium, lithium, and tetrabutylammonium perchlorates and tetrafluoroborates, and LiAsF6. Surface-sensitive Fourier transform infrared (FTIR) spectroscopy and X-ray microanalysis were used in order to characterize the various electrode surfaces, in addition to cyclic voltammetry. It was found that the metal formates (HCOOLi or (HCOO)2Ca) are the major surface species formed both on the active and on the nonactive electrodes at potentials below 1.5 V (Li/Li+) and that they passivate them. When CO2 and Li salt are present in MF solutions, films formed on both active and nonactive electrodes at low potentials contain both lithium formate and lithium carbonate.",

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year = "1992",

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T1 - Identification of Surface Films Formed on Active Metals and Nonactive Metal Electrodes at Low Potentials in Methyl Formate Solutions

AU - Ely, Yair Ein

AU - Aurbach, Doron

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Y1 - 1992/7/1

N2 - The electrochemical behavior of methyl formate (MF) and MF/CO2/Li salt solutions with active metals (lithium, calcium) and nonactive metals (nickel, gold) was investigated. The salts included calcium, lithium, and tetrabutylammonium perchlorates and tetrafluoroborates, and LiAsF6. Surface-sensitive Fourier transform infrared (FTIR) spectroscopy and X-ray microanalysis were used in order to characterize the various electrode surfaces, in addition to cyclic voltammetry. It was found that the metal formates (HCOOLi or (HCOO)2Ca) are the major surface species formed both on the active and on the nonactive electrodes at potentials below 1.5 V (Li/Li+) and that they passivate them. When CO2 and Li salt are present in MF solutions, films formed on both active and nonactive electrodes at low potentials contain both lithium formate and lithium carbonate.

AB - The electrochemical behavior of methyl formate (MF) and MF/CO2/Li salt solutions with active metals (lithium, calcium) and nonactive metals (nickel, gold) was investigated. The salts included calcium, lithium, and tetrabutylammonium perchlorates and tetrafluoroborates, and LiAsF6. Surface-sensitive Fourier transform infrared (FTIR) spectroscopy and X-ray microanalysis were used in order to characterize the various electrode surfaces, in addition to cyclic voltammetry. It was found that the metal formates (HCOOLi or (HCOO)2Ca) are the major surface species formed both on the active and on the nonactive electrodes at potentials below 1.5 V (Li/Li+) and that they passivate them. When CO2 and Li salt are present in MF solutions, films formed on both active and nonactive electrodes at low potentials contain both lithium formate and lithium carbonate.

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Identification of Surface Films Formed on Active Metals and Nonactive Metal Electrodes at Low Potentials in Methyl Formate Solutions

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