Electrocatalytic oxidation of ethanol on various metal ad-layer modified Au(111) electrodes in alkaline solution

Dursun, Zekerya; Karabiberoğlu, Şükriye Ulubay; Gelmez, Buket; Basaran, Aydan

doi:10.3906/kim-1007-777

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…50,51 The peak in the reverse direction indicates the removal of carbonaceous species adsorbed on the catalyst surface due to incomplete oxidation. 52,53 The backward oxidation peak for samples S3, S4, and S5 is observed at potentials of 1.06, 1.05, and 1.09 V with a peak current density of 1, 3.35, and 1.34 mA cm −2 respectively. Further, ethanol oxidation studies using commercial Pt/C have been carried out.…”

Section: Resultsmentioning

confidence: 98%

“…As gold has the ability to oxidize the poisoning species such as CO, therefore, on increasing the gold concentration peak current density gets enhanced. On further increase in gold concentration peak current density decreases which might be due to the agglomeration of gold nanoparticles, which can inhibit the adsorption of ethanol on the catalyst surface. , The peak in the reverse direction indicates the removal of carbonaceous species adsorbed on the catalyst surface due to incomplete oxidation. , The backward oxidation peak for samples S3, S4, and S5 is observed at potentials of 1.06, 1.05, and 1.09 V with a peak current density of 1, 3.35, and 1.34 mA cm –2 respectively. Further, ethanol oxidation studies using commercial Pt/C have been carried out.…”

Section: Resultsmentioning

confidence: 99%

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Mechanistic Insights for Photoelectrochemical Ethanol Oxidation on Black Gold Decorated Monoclinic Zirconia

Wadhwa¹,

Yadav²,

Goswami³

et al. 2021

ACS Appl. Mater. Interfaces

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Surface decoration of metal oxides by metals for enhancing their electrocatalytic properties for organic conversions has attracted a lot of researchers’ interest due to their high abundancy, inexpensiveness, and high stability. In the present work, a process for the synthesis of black gold (BG) using a citrate assisted chemical route and m-ZrO2 by a hydrothermal method at 200 °C has been developed. Further, different concentrations of black gold are being used to decorate the surface of zirconia by exploitation of surface potential of zirconia and gold surfaces. The catalyst having 6 mol % concentration of black gold shows excellent electrocatalytic activity for ethanol oxidation with low oxidation peak potential (1.17 V) and high peak current density (8.54 mA cm–2). The current density ratio (j f /j b ) is also high (2.54) for this catalyst indicating its high tolerance toward poisoning by intermediate species generated during the catalytic cycle. The enhanced electrocatalytic activity can be attributed to the high tolerance of gold toward CO poisoning and high stability of the ZrO2 support. The black gold decorated zirconia catalyst showed enhanced activity during photoelectrochemical studies when the entire spectrum of light falls on the catalyst. Ultrafast transient studies demonstrated plasmonic excitation of metallic free electrons and subsequent charge separation in the black gold–ZrO2 heterointerface as the key factor for enhanced photoelectrocatalytic activity.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Mechanistic Insights for Photoelectrochemical Ethanol Oxidation on Black Gold Decorated Monoclinic Zirconia

Wadhwa¹,

Yadav²,

Goswami³

et al. 2021

ACS Appl. Mater. Interfaces

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In-situ and operando Grazing Incidence XAS: a novel set-up and its application to model Pd electrodes for alcohols oxidation

Berretti,

Giaccherini,

Dell’Aquila

et al. 2024

Pure and Applied Chemistry

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In this article, we present an in-situ and operando time-resolved X-ray Absorption Spectroscopy (XAS) technique which exploits a combination of Grazing Incidence XAS (GIXAS) and Fixed Energy X-ray Absorption Voltammetry (FEXRAV), the Grazing Incidence FEXRAV (GI-FEXRAV). A case-study is also outlined. Palladium ultra-low loadings were deposited above Au polycrystalline iso-oriented substrates adopting three different deposition methods: surface-controlled electrochemical methods, direct electrodeposition, and physical vapour deposition (PVD). These catalytical surfaces were prepared for the investigation by GI-FEXRAV of the Pd oxidation/dissolution phenomenon that could occur when the metal is used in the anodic compartment of Direct Alcohol Fuel Cells (DAFCs) or in electrochemical reformers. Moreover, we report a robust, low cost and versatile procedure to obtain wide and flat iso-oriented gold substrates that can mimic monocrystalline gold (1 1 1) in the electrochemical response. The use of GI-FEXRAV for the operando characterization of the catalysts, in conjunction with the designed experimental cell and our flexible Au-based electrochemical substrates show an invaluable potential in the operando study of fundamental phenomena in heterogeneous electrocatalysis model systems and, due to its versatility, paves the way to further studies on a wide selection of electrochemical systems.

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CuO-grafen Nanokompozitlerinde Etanol Elektrooksidasyonu

Doğan

2019

Iğdır Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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Bu çalışmada Au elektrot yüzeyinde CuO-grafen (CuO/G) nanokompozitlerinin tek aşamalı elektrokimyasal sentezi gerçekleştirilmiştir. CuO/G yapılarının analitik karakterizasyonu için XRD ve EDS teknikleri kullanılmıştır. Morfolojik karakterizasyonu ise SEM kullanılarak yapılmıştır. CuO/G kompozitlerinin etanol elektro-oksidasyon reaksiyonunda elektrokatalizör olarak kullanımı incelenmiş ve dönüşümlü voltametri tekniği kullanılarak katalitik özellikleri araştırılmıştır. Etanol oksidasyonu için en yüksek akım yoğunluğu CuO/G kompozitinde elde edilmiştir. Sentezlenen nanokompozit filmin yakıt hücrelerinde elektrot malzemesi olarak kullanılabileceği belirlenmiştir.

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Electrocatalytic oxidation of ethanol on various metal ad-layer modified Au(111) electrodes in alkaline solution

Cited by 3 publications

References 2 publications

Mechanistic Insights for Photoelectrochemical Ethanol Oxidation on Black Gold Decorated Monoclinic Zirconia

Mechanistic Insights for Photoelectrochemical Ethanol Oxidation on Black Gold Decorated Monoclinic Zirconia

In-situ and operando Grazing Incidence XAS: a novel set-up and its application to model Pd electrodes for alcohols oxidation

CuO-grafen Nanokompozitlerinde Etanol Elektrooksidasyonu

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