Voltammetric and in situ infrared spectroscopy studies of hydroxyurea electrooxidation at Au(111) electrodes in HClO4 solutions

William Cheuquepán; José Manuel Orts; Antonio Rodes; Juan M. Feliu

doi:10.1016/j.elecom.2017.01.016

Voltammetric and in situ infrared spectroscopy studies of hydroxyurea electrooxidation at Au(111) electrodes in HClO₄ solutions

William Cheuquepán, José Manuel Orts, Antonio Rodes, Juan M. Feliu

University of Alicante

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

Abstract

The oxidation of hydroxyurea (H₂NCONHOH, HU) at Au(111) single crystal and Au(111)-25 nm thin film electrodes is studied spectroelectrochemically in HClO₄ solutions using external reflection infrared and Surface Enhanced Infrared Reflection Absorption Spectroscopy under Attenuated Total Reflection conditions (ATR-SEIRAS). The in situ external reflection spectra prove the formation of dissolved carbon dioxide and adsorbed cyanate during the electrooxidation of HU. The enhanced surface sensitivity of the ATR-SEIRAS experiments facilitates the detection of adsorbed cyanate and allows the observation of other adsorbate bands tentatively ascribed to reaction intermediates involving partial oxidation of the HU molecules, some of them corresponding to nitrosyl groups.

Original language	English
Pages (from-to)	34-37
Number of pages	4
Journal	Electrochemistry Communications
Volume	76
DOIs	https://doi.org/10.1016/j.elecom.2017.01.016
Publication status	Published - 1 Mar 2017
Externally published	Yes

Keywords

ATR-SEIRAS
Au(111)
External reflection infrared
Gold thin film
Hydroxyurea electrooxidation

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10.1016/j.elecom.2017.01.016

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title = "Voltammetric and in situ infrared spectroscopy studies of hydroxyurea electrooxidation at Au(111) electrodes in HClO4 solutions",

abstract = "The oxidation of hydroxyurea (H2NCONHOH, HU) at Au(111) single crystal and Au(111)-25 nm thin film electrodes is studied spectroelectrochemically in HClO4 solutions using external reflection infrared and Surface Enhanced Infrared Reflection Absorption Spectroscopy under Attenuated Total Reflection conditions (ATR-SEIRAS). The in situ external reflection spectra prove the formation of dissolved carbon dioxide and adsorbed cyanate during the electrooxidation of HU. The enhanced surface sensitivity of the ATR-SEIRAS experiments facilitates the detection of adsorbed cyanate and allows the observation of other adsorbate bands tentatively ascribed to reaction intermediates involving partial oxidation of the HU molecules, some of them corresponding to nitrosyl groups.",

keywords = "ATR-SEIRAS, Au(111), External reflection infrared, Gold thin film, Hydroxyurea electrooxidation",

author = "William Cheuquep{\'a}n and Orts, {Jos{\'e} Manuel} and Antonio Rodes and Feliu, {Juan M.}",

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year = "2017",

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doi = "10.1016/j.elecom.2017.01.016",

language = "English",

volume = "76",

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journal = "Electrochemistry Communications",

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TY - JOUR

T1 - Voltammetric and in situ infrared spectroscopy studies of hydroxyurea electrooxidation at Au(111) electrodes in HClO4 solutions

AU - Cheuquepán, William

AU - Orts, José Manuel

AU - Rodes, Antonio

AU - Feliu, Juan M.

PY - 2017/3/1

Y1 - 2017/3/1

N2 - The oxidation of hydroxyurea (H2NCONHOH, HU) at Au(111) single crystal and Au(111)-25 nm thin film electrodes is studied spectroelectrochemically in HClO4 solutions using external reflection infrared and Surface Enhanced Infrared Reflection Absorption Spectroscopy under Attenuated Total Reflection conditions (ATR-SEIRAS). The in situ external reflection spectra prove the formation of dissolved carbon dioxide and adsorbed cyanate during the electrooxidation of HU. The enhanced surface sensitivity of the ATR-SEIRAS experiments facilitates the detection of adsorbed cyanate and allows the observation of other adsorbate bands tentatively ascribed to reaction intermediates involving partial oxidation of the HU molecules, some of them corresponding to nitrosyl groups.

AB - The oxidation of hydroxyurea (H2NCONHOH, HU) at Au(111) single crystal and Au(111)-25 nm thin film electrodes is studied spectroelectrochemically in HClO4 solutions using external reflection infrared and Surface Enhanced Infrared Reflection Absorption Spectroscopy under Attenuated Total Reflection conditions (ATR-SEIRAS). The in situ external reflection spectra prove the formation of dissolved carbon dioxide and adsorbed cyanate during the electrooxidation of HU. The enhanced surface sensitivity of the ATR-SEIRAS experiments facilitates the detection of adsorbed cyanate and allows the observation of other adsorbate bands tentatively ascribed to reaction intermediates involving partial oxidation of the HU molecules, some of them corresponding to nitrosyl groups.

KW - ATR-SEIRAS

KW - Au(111)

KW - External reflection infrared

KW - Gold thin film

KW - Hydroxyurea electrooxidation

UR - http://www.scopus.com/inward/record.url?scp=85010433153&partnerID=8YFLogxK

U2 - 10.1016/j.elecom.2017.01.016

DO - 10.1016/j.elecom.2017.01.016

M3 - Article

AN - SCOPUS:85010433153

SN - 1388-2481

VL - 76

SP - 34

EP - 37

JO - Electrochemistry Communications

JF - Electrochemistry Communications

ER -

Voltammetric and in situ infrared spectroscopy studies of hydroxyurea electrooxidation at Au(111) electrodes in HClO₄ solutions

Abstract

Keywords

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