An in situ IR reflectance spectroscopic study of the electro-oxidation of D-sorbitol on platinum

L. Proença; M. I.S. Lopes; I. Fonseca; F. Hahn; C. Lamy

doi:10.1016/S0013-4686(98)00265-5

An in situ IR reflectance spectroscopic study of the electro-oxidation of D-sorbitol on platinum

L. Proença, M. I.S. Lopes, I. Fonseca, F. Hahn, C. Lamy

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

13 Citations (Scopus)

Abstract

An in situ infrared (IR) reflectance spectroscopic study of the electrooxidation of D-sorbitol on polycrystalline platinum in perchloric acid medium was carried out by Fourier transform IR spectroscopy (FTIRS), under the SNIFTIRS and SPAIRS variants. Additional information was obtained by electrochemically modulated IR reflectance spectroscopy (EMIRS). In situ IR spectra show that the electrooxidation of D-sorbitol on platinum proceeds via a dual-path mechanism involving both reactive and poisoning intermediates. Linearly and bridge-bonded CO, resulting from the dissociative adsorption of D-sorbitol, which were identified as the main poisoning species present at the surface, are fully oxidised to CO₂ at higher potentials. The superficial coverage in adsorbed CO was found to be function of the electrode potential. Moreover, the electrooxidation process can occur without breaking the initial molecule skeleton, indicating that molecular adsorption of D-sorbitol is also possible. D-glucono-(δ and γ)-lactones, D-glucose and CO₂ were identified as the main reaction products.

Original language	English
Pages (from-to)	1423-1430
Number of pages	8
Journal	Electrochimica Acta
Volume	44
Issue number	8-9
DOIs	https://doi.org/10.1016/S0013-4686(98)00265-5
Publication status	Published - 1 Dec 1998
Externally published	Yes

Keywords

D-sorbitol
Electrooxidation
IR reflectance spectroscopy
Platinum
Reaction mechanisms

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10.1016/S0013-4686(98)00265-5

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@article{e99f7efd90334767a4d5fdd2fef52663,

title = "An in situ IR reflectance spectroscopic study of the electro-oxidation of D-sorbitol on platinum",

abstract = "An in situ infrared (IR) reflectance spectroscopic study of the electrooxidation of D-sorbitol on polycrystalline platinum in perchloric acid medium was carried out by Fourier transform IR spectroscopy (FTIRS), under the SNIFTIRS and SPAIRS variants. Additional information was obtained by electrochemically modulated IR reflectance spectroscopy (EMIRS). In situ IR spectra show that the electrooxidation of D-sorbitol on platinum proceeds via a dual-path mechanism involving both reactive and poisoning intermediates. Linearly and bridge-bonded CO, resulting from the dissociative adsorption of D-sorbitol, which were identified as the main poisoning species present at the surface, are fully oxidised to CO2 at higher potentials. The superficial coverage in adsorbed CO was found to be function of the electrode potential. Moreover, the electrooxidation process can occur without breaking the initial molecule skeleton, indicating that molecular adsorption of D-sorbitol is also possible. D-glucono-(δ and γ)-lactones, D-glucose and CO2 were identified as the main reaction products.",

keywords = "D-sorbitol, Electrooxidation, IR reflectance spectroscopy, Platinum, Reaction mechanisms",

author = "L. Proen{\c c}a and Lopes, {M. I.S.} and I. Fonseca and F. Hahn and C. Lamy",

note = "Funding Information: This work was performed within the framework of a JNICT (Portugal)/CNRS (France) scientific collaboration programme. One of us (LP) acknowledges JNICT (PRAXIS XXI) for the award of a grant (BD/2645/93-RM). The financial support from JNICT-CECUL (Unidade I&D 301/94) is also acknowledged. ",

year = "1998",

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doi = "10.1016/S0013-4686(98)00265-5",

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pages = "1423--1430",

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T1 - An in situ IR reflectance spectroscopic study of the electro-oxidation of D-sorbitol on platinum

AU - Proença, L.

AU - Lopes, M. I.S.

AU - Fonseca, I.

AU - Hahn, F.

AU - Lamy, C.

N1 - Funding Information: This work was performed within the framework of a JNICT (Portugal)/CNRS (France) scientific collaboration programme. One of us (LP) acknowledges JNICT (PRAXIS XXI) for the award of a grant (BD/2645/93-RM). The financial support from JNICT-CECUL (Unidade I&D 301/94) is also acknowledged.

PY - 1998/12/1

Y1 - 1998/12/1

N2 - An in situ infrared (IR) reflectance spectroscopic study of the electrooxidation of D-sorbitol on polycrystalline platinum in perchloric acid medium was carried out by Fourier transform IR spectroscopy (FTIRS), under the SNIFTIRS and SPAIRS variants. Additional information was obtained by electrochemically modulated IR reflectance spectroscopy (EMIRS). In situ IR spectra show that the electrooxidation of D-sorbitol on platinum proceeds via a dual-path mechanism involving both reactive and poisoning intermediates. Linearly and bridge-bonded CO, resulting from the dissociative adsorption of D-sorbitol, which were identified as the main poisoning species present at the surface, are fully oxidised to CO2 at higher potentials. The superficial coverage in adsorbed CO was found to be function of the electrode potential. Moreover, the electrooxidation process can occur without breaking the initial molecule skeleton, indicating that molecular adsorption of D-sorbitol is also possible. D-glucono-(δ and γ)-lactones, D-glucose and CO2 were identified as the main reaction products.

AB - An in situ infrared (IR) reflectance spectroscopic study of the electrooxidation of D-sorbitol on polycrystalline platinum in perchloric acid medium was carried out by Fourier transform IR spectroscopy (FTIRS), under the SNIFTIRS and SPAIRS variants. Additional information was obtained by electrochemically modulated IR reflectance spectroscopy (EMIRS). In situ IR spectra show that the electrooxidation of D-sorbitol on platinum proceeds via a dual-path mechanism involving both reactive and poisoning intermediates. Linearly and bridge-bonded CO, resulting from the dissociative adsorption of D-sorbitol, which were identified as the main poisoning species present at the surface, are fully oxidised to CO2 at higher potentials. The superficial coverage in adsorbed CO was found to be function of the electrode potential. Moreover, the electrooxidation process can occur without breaking the initial molecule skeleton, indicating that molecular adsorption of D-sorbitol is also possible. D-glucono-(δ and γ)-lactones, D-glucose and CO2 were identified as the main reaction products.

KW - D-sorbitol

KW - Electrooxidation

KW - IR reflectance spectroscopy

KW - Platinum

KW - Reaction mechanisms

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DO - 10.1016/S0013-4686(98)00265-5

M3 - Article

AN - SCOPUS:0032289848

SN - 0013-4686

VL - 44

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JO - Electrochimica Acta

JF - Electrochimica Acta

IS - 8-9

ER -

An in situ IR reflectance spectroscopic study of the electro-oxidation of D-sorbitol on platinum

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