Substrate catalyzed formation of Au-Cu bimetallic nanoparticles as electrocatalyst for the reduction of dioxygen and hydrogen peroxide

Gowthaman, N.S.K.; Shankar, Sekar; John, S. Abraham

doi:10.1016/j.jelechem.2018.01.053

Cited by 21 publications

(8 citation statements)

References 44 publications

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“…On the other hand, there appeared two component bands for the Cu 2p emission (Figure b) at the BE positions 932.5 and 952.1 eV, which correspond to the Cu 2p 3/2 and Cu 2p 1/2 core-level emissions of metallic Cu, respectively . The absence of strong satellite peaks around 935 and 955 eV confirmed that copper in the Au–Cu NSs does not exist in the Cu 2+ state …”

Section: Resultsmentioning

confidence: 86%

Controlled Fabrication of Flower-Shaped Au–Cu Nanostructures Using a Deep Eutectic Solvent and Their Performance in Surface-Enhanced Raman Scattering-Based Molecular Sensing

2020

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Controlled synthesis of anisotropic bimetallic nanostructures with tunable morphology is of great current interest for their applications in surface-enhanced Raman scattering (SERS), plasmonics, and catalysis. Despite huge effort that has been devoted so far, fabrication of bimetallic nanostructures with controlled morphology and size remained to be a great challenge, especially when their shapes are anisotropic. Here, we report a facile, one-step synthetic approach for the fabrication of anisotropic bimetallic gold–copper nanostructures (Au–Cu NSs) of the 200–300 nm size range, using choline chloride/urea (ChCl/urea)-based deep eutectic solvent (DES) as the soft template. A concentration of the CuCl2 precursor in the reaction mixture was found to impact the reduction kinetics of the metal ions, directly affecting the final morphology of the Au–Cu nanostructures and elemental distributions in them. The fabricated anisotropic Au–Cu NSs revealed a high SERS signal for crystal violet (CV) molecules adsorbed at their surfaces, with the signal enhancement factor as high as 0.21 × 106 and capacity of detecting CV molecules of concentrations as low as 10–10 M in their aqueous solutions. The growth mechanism of the anisotropic bimetallic nanostructures in DES and their SERS performance has been discussed. The simple DES-assisted synthesis strategy presented in this work can be adopted for large-scale nonaqueous fabrication of other bimetallic nanostructures in a quite “greener” way.

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Section: Resultsmentioning

confidence: 86%

Controlled Fabrication of Flower-Shaped Au–Cu Nanostructures Using a Deep Eutectic Solvent and Their Performance in Surface-Enhanced Raman Scattering-Based Molecular Sensing

2020

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“…The sensitivity of the cactus-like CuO nanostructures grown at −0.5 V is 2015.7 μA mM –1 cm –2 , which is the superior to those of the reported electrochemical sensors (Table ). − ,,− …”

Section: Results and Discussionmentioning

confidence: 99%

“…Due to its simplicity, fast response, and easy miniaturization, an electrochemical method has been considered as the best for glucose and H 2 O 2 determination. ,− ,− Generally, the electrochemical biosensor is always working with the glucose oxidase (GOx) enzyme by virtue of its high selectivity and sensitivity. , However, the most common and serious problems for the enzymatic glucose sensor are its poor long-term stability, reproducibility, sensitivity to the environment, complicated immobilization procedure, and high cost of enzymes . Therefore, intense efforts have been devoted to the development of an economically viable and interference-free non-enzymatic sensor with high reproducibility that is free of interference and reliably fast that has been echoed by several researchers.…”

Section: Introductionmentioning

confidence: 99%

Negative Potential-Induced Growth of Surfactant-Free CuO Nanostructures on an Al–C Substrate: A Dual In-Line Sensor for Biomarkers of Diabetes and Oxidative Stress

Gowthaman

Arul

Lim

et al. 2020

ACS Sustainable Chem. Eng.

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Identifying a non-enzymatic sensor electrocatalyst for the accurate determination of biomolecules is a paramount task. The weird morphology of the nanomaterial may exhibit the remarkable activity to enhance the sensitivity of the electrode, and hence, tuning the shape of the nanomaterials is one of the important criteria for electrochemical sensors. Thus, this study sought to fabricate a non-enzymatic sensor with different CuO morphologies by an eco-friendly and facile approach. Different surfactant-free CuO nanostructures were fabricated on the highly conductive flexible aluminum-carbide substrate for the electrochemical assessment of glucose and H2O2 in human fluids. The CuO nanostructures were initially electrodeposited at −0.1, −0.3, −0.5, and −0.7 V and then calcined in air at 120 °C for 2 h. Different CuO nanostructures with a polygonal and cactus-like morphology were observed in scanning electron microscopic images. The as-fabricated electrodes were also characterized by X-ray diffraction (XRD), Xray photoelectron spectroscopy, and electrochemical impedance spectroscopy analysis.Texture coefficients (TC) of different CuO nanostructures were calculated from XRD analysis, and the CuO nanostructures grown at −0.5 V exhibited the highest TC with their texture along the (022) plane. The electrodes grown with different CuO nanostructures exhibited shapedependent electrocatalytic activity against glucose and H2O2, and the cactus-like CuO nanostructures grown at −0.5 V showed superior electrochemical behavior compared to that of the other nanostructures by showing superior sensitivities of 3892.6 and 2015.7 μA mM-1 cm-2, respectively, against glucose and H2O2. In addition, the sensor grown with a cactus-like CuO nanostructure exhibited high selectivity, storage capability, and good practicability. This sensor proved to be practical by determining glucose and H2O2 levels in human fluids. It is believed that the proposed electrochemical sensor will have a strong impact in the dual in-line sensing of biomarkers in both biological and clinical fields in the near future.

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“…Cu‐based bimetallic catalysts demonstrated superior performance compared with Cu‐based monometallic catalysts. Some recent reports have represented more catalytic properties in CuPd for the Sonogashira reaction, CuZn for synthesis of triazines, CuMn for aerobic oxidative synthesis of benzothiazoles and quinoxalines, CuNi for regioselective γ,δ‐diarylation of alkenyl ketimines, hydrodeoxygenation of dibenzofuran and hydrogen generation, CuPt as electrocatalyst, CuAg for enamination of 1,3‐dicarbonyl compounds, selective ammonia oxidation, click reaction and as a photocatalyst, CuAu in click reaction, as an electrocatalyst and CuFe for the Ulmann–Goldberg coupling reaction, than their monometallic Cu constituent.…”

Section: Introductionmentioning

confidence: 99%

Introduction of Ag/CuO/MCM‐48 as an efficient catalyst for the one‐pot synthesis of novel pyran‐pyrrole hybrids

Tavakoli

Mamaghani

Sheykhan

2019

Applied Organom Chemis

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Bimetallic silver and copper incorporated mesoporous MCM‐48 (Ag/CuO/MCM‐48) was synthesized by simple wet‐impregnation method. The knowledge about its structural properties was gathered by means of Fourier transform‐infrared, energy‐dispersive X‐ray, X‐ray diffraction, field emission‐scanning electron microscopy, transmission electron microscopy and Brunauer–Emmett–Teller analyses. The catalytic activity of Ag/CuO/MCM‐48 was examined in the one‐pot three‐component reaction of 3‐(1‐methyl‐1H‐pyrrol‐2‐yl)‐3‐oxopropanenitrile, malononitrile and various aromatic aldehydes leading to novel pyran‐pyrrole hybrid derivatives in reduced reaction times (5–10 min) and excellent yields (88–97%). Application of Ag/CuO/MCM‐48 as a potent heterogeneous catalyst with good reusability up to five times, use of ethanol as an eco‐compatible medium and chromatography‐free work‐up are some crucial green aspects of this procedure.

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Substrate catalyzed formation of Au-Cu bimetallic nanoparticles as electrocatalyst for the reduction of dioxygen and hydrogen peroxide

Cited by 21 publications

References 44 publications

Controlled Fabrication of Flower-Shaped Au–Cu Nanostructures Using a Deep Eutectic Solvent and Their Performance in Surface-Enhanced Raman Scattering-Based Molecular Sensing

Controlled Fabrication of Flower-Shaped Au–Cu Nanostructures Using a Deep Eutectic Solvent and Their Performance in Surface-Enhanced Raman Scattering-Based Molecular Sensing

Negative Potential-Induced Growth of Surfactant-Free CuO Nanostructures on an Al–C Substrate: A Dual In-Line Sensor for Biomarkers of Diabetes and Oxidative Stress

Introduction of Ag/CuO/MCM‐48 as an efficient catalyst for the one‐pot synthesis of novel pyran‐pyrrole hybrids

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