Effect of electrochemical activation on the performance and stability of hybrid (PPy/Cu2O nanodendrites) for efficient ethanol oxidation in alkaline medium

Attar, Anas El; Oularbi, Larbi; Chemchoub, Sanaa; Rhazi, Mama El

doi:10.1016/j.jelechem.2021.115042

Cited by 31 publications

(30 citation statements)

References 86 publications

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“…As can be seen, Cu(OH) 2 -Cu 2 O was homogeneously deposited on PPy/F-MWCNTs with a threedimensional nanodendritic structure constituted by multiple symmetrical branches attached to a pronounced central backbone. This kind of morphology is due to the presence of Cl − ion present in copper solution as reported in the literature (Zhuo et al, 2017;El Attar et al, 2021;Halim et al, 2021).…”

Section: Electrodes Preparation and Characterizationsupporting

confidence: 57%

“…It has been demonstrated that the regeneration of copper in acidic medium plays an important role in the morphology of the material (copper oxide) varying from the octahedral particles to the dendritic one. This change in the morphology leads to an increase of the performance of the catalyst in terms of stability and durability toward ethanol oxidation (El Attar et al, 2020;El Attar et al, 2021). In this study, our goal is to explore the effect of F-MWCNTs on deposition of copper hydroxide-copper oxide nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

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Designing New Material Based on Functionalized Multi-Walled Carbon Nanotubes and Cu(OH)2–Cu2O/Polypyrrole Catalyst for Ethanol Oxidation in Alkaline Medium

et al. 2022

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In this work, copper(II) hydroxide (Cu(OH)2) and copper oxide (Cu2O) nanostructures are deposited on functionalized multi-walled carbon nanotubes/polypyrrole to report an efficient electrocatalyst for ethanol oxidation in alkaline medium. In the first step, the deposition of functionalized multi-walled nanotubes of carbon (F-MWCNTs) on the electrode surface was carried out using drop casting mode followed by the electrodeposition of polypyrrole (PPy) and copper nanoparticles (Cu-Nps) using galvanostatic mode. Scanning electron microscopy (SEM) and X-ray diffraction (XRD) were performed in order to study the morphology and the structure of the elaborated catalysts. Electrochemical characterization conducted by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) revealed that the introduction of functionalized multi-walled carbon nanotubes enhances the electric properties of the nanocomposites and offers a large active surface area. The prepared electrocatalyst was then tested in a solution of 0.1 M NaOH containing 0.2 M of ethanol showing high performance (7 mA cm−2 at 0.85 V vs Ag/AgCl) and good stability (over 1800 s) toward ethanol oxidation.

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Section: Electrodes Preparation and Characterizationsupporting

confidence: 57%

Section: Introductionmentioning

confidence: 99%

Designing New Material Based on Functionalized Multi-Walled Carbon Nanotubes and Cu(OH)2–Cu2O/Polypyrrole Catalyst for Ethanol Oxidation in Alkaline Medium

et al. 2022

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“…Therefore, electrodes with nanostructured copper oxides can be considered as platinum group metals electrodes substituents in fuel cells. El Attar et al (2021) demonstrated that ethanol molecules are totally oxidized on Cu2O nanodendrites, with the formation of CO2 molecules as a final product (El Attar et al, 2021). Thus, Cu is a very promising catalyst for the oxidation of alcohols.…”

Section: Introductionmentioning

confidence: 99%

“…The use of copper (Cu) as a catalyst for the electrochemical oxidation of alcohols in alkaline media has attracted considerable attention in recent years due to the development of alcohol fuel cells (Giri and Sarkar, 2016). Copper oxides have attracted particular attention, with a number of studies showing that they can improve catalytic activity and adsorption properties (Giziński et al, 2020;El Attar et al, 2021). Previous studies investigated the catalytic activities of Cu as a base (Wu et al, 2017;Fahim et al, 2018) and as a component in multicomponent catalysts (Freitasa et al, 2014;Almukhlifia and Burns, 2015;Oznuluer et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Chemical Resistance and Catalytic Activity of Copper in the Process of Electrooxidation of Ethanol in Strong Alkaline Media

Таранцева¹,

Politaeva²,

Таранцев³

et al. 2021

IJTech

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The possibility of using copper (Cu) as a catalyst in nonflowing membraneless alkaline fuel cells was investigated. In the present study, the interface between two immiscible liquids served as a virtual membrane. We studied two immiscible liquid systems: Ethanol+K3PO4+H2O (No. 1 electrolyte) and Ethanol+KOH+H2O (No. 2 electrolyte). Cyclic voltammetry, pulse chronoamperometry, and gas-liquid chromatography were used to study the corrosion resistance and catalytic activity of ethanol oxidation on Cu. Analyses of chromatograms obtained after charging and discharging the fuel cells revealed the presence of ethanol oxidation products, mainly in the form of acetaldehyde, which indicates the predominant mechanism of C2 oxidation of ethanol in the studied system. That is, with the release of two and four electrons during the oxidation of alcohol and the formation of acetaldehyde and acetic acid. Anodic currents of Cu dissolution in No. 1 electrolyte were an order of magnitude lower than in the No. 2 electrolyte. The catalytic activity of Cu during the oxidation of ethyl alcohol EtOH in the electrolyte with potassium hydroxide was at least five times higher than in the electrolyte with potassium phosphates, at almost the same pH values. The surface compounds on the Cu electrode in the first electrolyte were composed mainly of monovalent and bivalent Cu compounds, whereas they were composed of trivalent Cu compounds in the second electrolyte. Thus, the possibility of using Cu as a catalyst for the oxidation of EtOH in alkaline nonflowing membraneless fuel cells has been established. To further increase the catalytic activity of Cu and expand its commercial attractiveness as a catalyst, further research is needed to optimize its composition and structure and create bimetallic and multimetallic Cu-based electrodes, including nanostructured ones.

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“…Indeed, Shirakawa, MacDiarmid and Heeger have received the Nobel Prize in 2000 for the discovery of conducting polymers [44]. Indeed, the conducting polymers have shown a great potential in medicine [45], energy storage and conversion [46–48], corrosion protection [49], electrochemistry [50], and other areas of research. In electrochemistry, conducting polymers offer several privileges such as a fast and uniform modification of the electrode surface as well as a control of the polymeric film thickness.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Materials Based on Conducting Polymers for Nitrite Sensing: A Mini Review

Salhi¹,

Ez-zine²,

Rhazi³

2021

Electroanalysis

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Well‐known as a hazardous compound, nitrite constitute a real threat to the public health. So, there is a pressing need to detect and quantify them in different matrix. Even though conventional analytical methods can be used to address this issue, electrochemistry allows a fast, sensitive, and efficient analysis. Conducting polymers continue to raise great interest among scientific communities due to their properties. Moreover, their combination with carbon nanomaterials, or metallic nanoparticles improves their properties, and provides great results. In this paper, we will focus on some revealing works devoted to the electrochemical detection of nitrite using this kind of materials.

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Effect of electrochemical activation on the performance and stability of hybrid (PPy/Cu2O nanodendrites) for efficient ethanol oxidation in alkaline medium

Cited by 31 publications

References 86 publications

Designing New Material Based on Functionalized Multi-Walled Carbon Nanotubes and Cu(OH)2–Cu2O/Polypyrrole Catalyst for Ethanol Oxidation in Alkaline Medium

Designing New Material Based on Functionalized Multi-Walled Carbon Nanotubes and Cu(OH)2–Cu2O/Polypyrrole Catalyst for Ethanol Oxidation in Alkaline Medium

Chemical Resistance and Catalytic Activity of Copper in the Process of Electrooxidation of Ethanol in Strong Alkaline Media

Hybrid Materials Based on Conducting Polymers for Nitrite Sensing: A Mini Review

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