Nanostructuring of anodic copper oxides in fluoride-containing ethylene glycol media

Jerez, Diego P. Oyarzún; Teijelo, M. López; Cervantes, Wilkendry Ramos; Pérez, Omar E. Linarez; Sánchez, Julio; Pizarro, Guadalupe del C.; Acosta, Gabriela; Flores, Marcos; Arratia‐Pérez, Ramiro

doi:10.1016/j.jelechem.2017.11.047

Cited by 30 publications

(18 citation statements)

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“…Figure 2A shows the Raman spectra for the films obtained by electrodeposition in the presence and absence of p(NVP-co-AI) copolymer. The appearance of the signals at 149 cm −1 , 542 cm −1 and 623 cm −1 , and the absence of the bands at 289 cm −1 , 296 cm −1 and 345 cm −1 , show the presence mainly of copper (I) oxide species on the ITO surfaces (Oyarzún, López et al, 2017).…”

Section: Resultsmentioning

confidence: 94%

Electrodeposition of Cu2O nanostructures with improved semiconductor properties

et al. 2021

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In the present research, nanocomposites based on copper (I) oxide poly (1-vinyl-2-pyrolidone-co-itaconic acid) nanostructures (Cu 2 O/p(NVP-co-AI)) were synthesized by the electrodeposition method using the copolymer p(NVP-co-AI) as a stabilizing agent in the reduction of Cu +2 to Cu + . The chemical and physical properties of the nanostructures were characterized by techniques such as scanning electron microscopy, infrared (IR) spectroscopy, Raman and ultraviolet-visible spectrophotometry. The obtained nanostructures are mainly a mixture of agglomerated nanospheres with a diameter of approximately 78 to 91 nm, with an alternation of nanolaminar structures, composed of copper (I) oxide species. In the case of the Cu 2 O/p(NVP-co-AI) nanocomposite, it was observed a decrease in the carbonoxygen vibration links of the carbonyl groups in IR intensity for the polymer when it was dissolved in the electrolytic solution, which indicates that interactions are produced by the carbonyl groups with the Cu 2 O species. In addition, bandgap values of 1.80 and 1.63 eV were estimated by the Kubelka-Munk method for Cu 2 O and Cu 2 O/p(NVP-co-AI) samples, respectively.

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Section: Resultsmentioning

confidence: 94%

Electrodeposition of Cu2O nanostructures with improved semiconductor properties

et al. 2021

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“…Copper anodizing in NaOH in two-electrode system allows formation of nanoneedles (1.0 M NaOH, 6 mA cm -2 , 5 min, 25 • C) [57]. Moreover, what is in-line in Allam and Grimes findings [56], modification of the anodizing electrolyte has a significant impact on the oxides' morphology: addition of chlorides allows formation of chrysanthemum-like nanostructures (4 g L -1 NaOH + 1200 g L -1 NaCl, 0.2 mA cm -2 ) [58], while anodization in ethylene glycol (EG) based, fluoride rich electrolyte allows formation of nanoporous oxide (EG based electrolytes containing: 0.1-0.5 M KOH, 1 vol% H 2 O, up to 0.1 wt% NH 4 F; 20 V, 5 • C, 15 min) [59].…”

Section: Morphology and Composition Of Nanostructures Grown By Copper Anodizingmentioning

confidence: 99%

Nanostructured Anodic Copper Oxides as Catalysts in Electrochemical and Photoelectrochemical Reactions

et al. 2020

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Recently, nanostructured copper oxides formed via anodizing have been intensively researched due to their potential catalytic applications in emerging issues. The anodic Cu2O and CuO nanowires or nanoneedles are attractive photo- and electrocatalysts since they show wide array of desired electronic and morphological features, such as highly-developed surface area. In CO2 electrochemical reduction reaction (CO2RR) copper and copper-based nanostructures indicate unique adsorption properties to crucial reaction intermediates. Furthermore, anodized copper-based materials enable formation of C2+ hydrocarbons and alcohols with enhanced selectivity. Moreover, anodic copper oxides provide outstanding turnover frequencies in electrochemical methanol oxidation at lowered overpotentials. Therefore, they can be considered as precious metals electrodes substituents in direct methanol fuel cells. Additionally, due to the presence of Cu(III)/Cu(II) redox couple, these materials find application as electrodes for non-enzymatic glucose sensors. In photoelectrochemistry, Cu2O-CuO heterostructures of anodic copper oxides with highly-developed surface area are attractive for water splitting. All the above-mentioned aspects of anodic copper oxides derived catalysts with state-of-the-art background have been reviewed within this paper.

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“…Additives, compounds added to the electrolytes, allow the modification of the morphology, as detailed in the abovementioned publication [ 42 ]. It is worth noting that recently a manufactured nanoporous material made of Cu 2 O, CuO, Cu(OH) 2 , and CuF 2 was obtained with a pore diameter ranging from 6 to 15 nm [ 49 ]. Typically, the majority of the anodic oxides formed on copper are made of nanowires, nanoneedles, or nanorods.…”

Section: Strategies Of Copper Anodizationmentioning

confidence: 99%

Review of Fabrication Methods, Physical Properties, and Applications of Nanostructured Copper Oxides Formed via Electrochemical Oxidation

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Misiołek

2018

Nanomaterials

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Typically, anodic oxidation of metals results in the formation of hexagonally arranged nanoporous or nanotubular oxide, with a specific oxidation state of the transition metal. Recently, the majority of transition metals have been anodized; however, the formation of copper oxides by electrochemical oxidation is yet unexplored and offers numerous, unique properties and applications. Nanowires formed by copper electrochemical oxidation are crystalline and composed of cuprous (CuO) or cupric oxide (Cu2O), bringing varied physical and chemical properties to the nanostructured morphology and different band gaps: 1.44 and 2.22 eV, respectively. According to its Pourbaix (potential-pH) diagram, the passivity of copper occurs at ambient and alkaline pH. In order to grow oxide nanostructures on copper, alkaline electrolytes like NaOH and KOH are used. To date, no systemic study has yet been reported on the influence of the operating conditions, such as the type of electrolyte, its temperature, and applied potential, on the morphology of the grown nanostructures. However, the numerous reports gathered in this paper will provide a certain view on the matter. After passivation, the formed nanostructures can be also post-treated. Post-treatments employ calcinations or chemical reactions, including the chemical reduction of the grown oxides. Nanostructures made of CuO or Cu2O have a broad range of potential applications. On one hand, with the use of surface morphology, the wetting contact angle is tuned. On the other hand, the chemical composition (pure Cu2O) and high surface area make such materials attractive for renewable energy harvesting, including water splitting. While compared to other fabrication techniques, self-organized anodization is a facile, easy to scale-up, time-efficient approach, providing high-aspect ratio one-dimensional (1D) nanostructures. Despite these advantages, there are still numerous challenges that have to be faced, including the strict control of the chemical composition and morphology of the grown nanostructures, their uniformity, and understanding the mechanism of their growth.

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Nanostructuring of anodic copper oxides in fluoride-containing ethylene glycol media

Cited by 30 publications

References 27 publications

Electrodeposition of Cu2O nanostructures with improved semiconductor properties

Electrodeposition of Cu2O nanostructures with improved semiconductor properties

Nanostructured Anodic Copper Oxides as Catalysts in Electrochemical and Photoelectrochemical Reactions

Review of Fabrication Methods, Physical Properties, and Applications of Nanostructured Copper Oxides Formed via Electrochemical Oxidation

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