Preparation and characterization of Cu clusters and Cu–Ag alloy via galvanic replacement method for azo dyes degradation

Rahmatolahzadeh, Reza; Ebadi, Mehdi; Motevalli, Kourosh

doi:10.1007/s10854-016-6281-8

Cited by 7 publications

(3 citation statements)

References 34 publications

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“…It is also worth mentioning that calcination at 400 • C did not alter the otherwise tubular structure of titanium oxide nanotubes ( Figure 3C). It is established in the literature that the morphology of the TNT depends on the choice of the starting material [67]. Titanium oxide in the anatase form or a mixture of rutile and anatase such as Degussa (P-25) generally favors the formation of well-defined nanotubes, which is also confirmed from this work [63].…”

Section: Temsupporting

confidence: 79%

Synthesis and Evaluation of Copper-Supported Titanium Oxide Nanotubes as Electrocatalyst for the Electrochemical Reduction of Carbon Oxide to Organics

et al. 2019

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Carbon dioxide (CO2) is considered as the prime reason for the global warming effect and one of the useful ways to transform it into an array of valuable products is through electrochemical reduction of CO2 (ERC). This process requires an efficient electrocatalyst with high faradaic efficiency at low overpotential and enhanced reaction rate. Herein, we report an innovative way of reducing CO2 using copper-metal supported on titanium oxide nanotubes (TNT) electrocatalysts. The TNT support material was synthesized using alkaline hydrothermal process with Degussa (P-25) as a starting material. Copper nanoparticles were anchored on the TNT by homogeneous deposition-precipitation method (HDP) with urea as precipitating agent. The prepared catalysts were tested in a home-made H-cell with 0.5 M NaHCO3 aqueous solution in order to examine their activity for ERC and the optimum copper loading. Continuous gas-phase ERC was carried out in a solid polymer electrolyte (SPE) reactor. The 10% Cu/TNT catalysts were employed in the gas diffusion layer (GDL) on the cathode side with Pt-Ru/C on the anode side. Faradaic efficiencies for the three major products namely methanol, methane, and CO were found to be 4%, 3%, and 10%, respectively at −2.5 V with an overall current density of 120 mA/cm2. The addition of TNT significantly increased the catalytic activity of electrocatalyst for ERC. It is mainly attributed to their better stability towards oxidation, increased CO2 adsorption capacity and stabilization of the reaction intermediate, layered titanates, and larger surface area (400 m2/g) as compared with other support materials. Considering the low cost of TNT, it is anticipated that TNT support electrocatalyst for ECR will gain popularity.

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Section: Temsupporting

confidence: 79%

Synthesis and Evaluation of Copper-Supported Titanium Oxide Nanotubes as Electrocatalyst for the Electrochemical Reduction of Carbon Oxide to Organics

et al. 2019

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“…For example, the synthesis of Pt-Cu and Pt-Pd concave NCs, cubic Au-Ag nanoframes, Au-based hollow nanostructures, and nanodendritic structures. [94][95][96][97][98][99][100] Qin et al conducted a series of studies, and they found that a capping agent can significantly regulate the final nanostructures. [101][102][103] They demonstrated the synthesis of Ag NCs with concave side faces, Au-Ag alloy frames (Ag@Au-Ag concave nanocrystals), and Ag@Au core-shell NCs.…”

Section: Underpotential Deposition (Upd) and Galvanic Replacement Reactionmentioning

confidence: 99%

Shaping well-defined noble-metal-based nanostructures for fabricating high-performance electrocatalysts: advances and perspectives

Yin

Zhou

Zhang

2019

Inorg. Chem. Front.

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“…These copper compounds (copper oxide and copper sulfide) can absorb light energy under visible light illumination, causing holes (h + ) in the valence band (VB) and electrons (e − ) in the conduction band (CB) for catalytic reactions [23][24][25]. It is attractive that copper has two oxide states of Cu(II) and Cu(I), and they combine with H 2 O 2 in a Fenton-like process to generate hydroxyl radicals (•OHs) and other reactive groups [26][27][28][29][30], which assist the reaction [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

In Situ Partial Sulfidation for Preparing Cu/Cu2−xS Core/Shell Nanorods with Enhanced Photocatalytic Degradation

Zhong

Wang

et al. 2022

Catalysts

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Herein, we report an approach to prepare Cu/Cu2−xS core/shell nanorods by in situ sulfidation of copper nanorods. Firstly, copper nanorods with tunable longitudinal surface plasmon resonances were synthesized by a seed-mediated method using Au nanoparticles as seeds. A convenient in situ sulfidation method was then applied to convert the outermost layer of Cu nanorods into Cu2−xS, to increase their stability and surface activity in photocatalytic applications. The thickness of Cu2−xS layer can be adjusted by controlling the amount of S source. The Cu/Cu2−xS core/shell nanorods exhibits two characteristic surface plasmon resonances located in visible and near-infrared regions, respectively. The photocatalytic performances of Cu nanorods and their derivatives were evaluated by measuring the degradation rate of methyl orange dyes. Compared with Cu nanorods, the Cu/Cu2−xS core/shell nanorods demonstrate more than a 13.6-fold enhancement in the degradation rate at 40 min. This work suggests a new direction for constructing derivative nanostructures of copper nanorods and exploring their applications.

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Preparation and characterization of Cu clusters and Cu–Ag alloy via galvanic replacement method for azo dyes degradation

Cited by 7 publications

References 34 publications

Synthesis and Evaluation of Copper-Supported Titanium Oxide Nanotubes as Electrocatalyst for the Electrochemical Reduction of Carbon Oxide to Organics

Synthesis and Evaluation of Copper-Supported Titanium Oxide Nanotubes as Electrocatalyst for the Electrochemical Reduction of Carbon Oxide to Organics

Shaping well-defined noble-metal-based nanostructures for fabricating high-performance electrocatalysts: advances and perspectives

In Situ Partial Sulfidation for Preparing Cu/Cu2−xS Core/Shell Nanorods with Enhanced Photocatalytic Degradation

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