In this study, the electrochemical reduction reaction of copper(II) formate on the graphene/ glas... more In this study, the electrochemical reduction reaction of copper(II) formate on the graphene/ glassy carbon electrode (G/GCE) surface in the HCl (5 wt.%) was employed for fabrication of the PdeCu nanostructures by galvanic displacement reaction. This method has a number of advantages including being environmentally-friendly, simplicity, inexpensiveness and fast. The PdeCu nanostructures decorated on the G/GCE were fabricated in two steps: (1) electrochemical reduction reaction of copper(II) formate to Cu on the G/GCE and (2) the galvanic replacement reaction between Cu and Pd 2þ ions. The physical and electrochemical properties of as-prepared PdeCu/G were investigated via Field Emission Scanning Electron Microscopy, Energy Dispersive X-ray Spectroscopy, Cyclic Voltammetry, Chronoamperometry, and Electrochemical Impedance Spectroscopy. The PdeCu/G compositional effect on ethanol oxidation in alkaline media is investigated. The results were shown that the catalytic activity and durability of PdeCu/G catalyst are superior to those of Pd/C electrocatalyst for ethanol oxidation. The PdeCu/G increased the current density 6.2 times more than Pd/C with a 50 mv negative shift in onset potential for electrooxidation of ethanol. Besides, the novel PdeCu/G catalyst exhibits large electrochemically active surface area, lower apparent activation energy, higher levels of stability, poisoning tolerance, and lower charge transfer resistance compared to the Pd/C for the oxidation of ethanol.
The dicopper-substituted γ-Keggin silicotungstate with bis-μ-1,1-azido ligands TBA4H2[γ-SiW10O36C... more The dicopper-substituted γ-Keggin silicotungstate with bis-μ-1,1-azido ligands TBA4H2[γ-SiW10O36Cu2(μ-1,1-N3)2] (TBA = tetrabutylammonium) could act as an effective homogeneous precatalyst for the ...
In this study, the electrochemical reduction reaction of copper(II) formate on the graphene/glass... more In this study, the electrochemical reduction reaction of copper(II) formate on the graphene/glassy carbon electrode (G/GCE) surface in the HCl (5 wt.%) was employed for fabrication of the Pdsingle bondCu nanostructures by galvanic displacement reaction. This method has a number of advantages including being environmentally-friendly, simplicity, inexpensiveness and fast. The Pdsingle bondCu nanostructures decorated on the G/GCE were fabricated in two steps: (1) electrochemical reduction reaction of copper(II) formate to Cu on the G/GCE and (2) the galvanic replacement reaction between Cu and Pd2+ ions. The physical and electrochemical properties of as-prepared Pdsingle bondCu/G were investigated via Field Emission Scanning Electron Microscopy, Energy Dispersive X-ray Spectroscopy, Cyclic Voltammetry, Chronoamperometry, and Electrochemical Impedance Spectroscopy. The Pdsingle bondCu/G compositional effect on ethanol oxidation in alkaline media is investigated. The results were shown that the catalytic activity and durability of Pdsingle bondCu/G catalyst are superior to those of Pd/C electrocatalyst for ethanol oxidation. The Pdsingle bondCu/G increased the current density 6.2 times more than Pd/C with a 50 mv negative shift in onset potential for electrooxidation of ethanol. Besides, the novel Pdsingle bondCu/G catalyst exhibits large electrochemically active surface area, lower apparent activation energy, higher levels of stability, poisoning tolerance, and lower charge transfer resistance compared to the Pd/C for the oxidation of ethanol.
Tetrahydrobenzo[b]pyran and 3,4-dihydropyrano[c]chromene derivatives were synthesized via a one-p... more Tetrahydrobenzo[b]pyran and 3,4-dihydropyrano[c]chromene derivatives were synthesized via a one-pot three-component condensation of aromatic aldehydes with malononitrile and dimedone or 4-hydroxycoumarin in excellent yields in the presence of starch solution as a highly efficient homogenous catalyst. The use of a nontoxic and biodegradable catalyst, simple work-up procedure, and short reaction time are advantages of this method.
In this study, the electrochemical reduction reaction of copper(II) formate on the graphene/ glas... more In this study, the electrochemical reduction reaction of copper(II) formate on the graphene/ glassy carbon electrode (G/GCE) surface in the HCl (5 wt.%) was employed for fabrication of the PdeCu nanostructures by galvanic displacement reaction. This method has a number of advantages including being environmentally-friendly, simplicity, inexpensiveness and fast. The PdeCu nanostructures decorated on the G/GCE were fabricated in two steps: (1) electrochemical reduction reaction of copper(II) formate to Cu on the G/GCE and (2) the galvanic replacement reaction between Cu and Pd 2þ ions. The physical and electrochemical properties of as-prepared PdeCu/G were investigated via Field Emission Scanning Electron Microscopy, Energy Dispersive X-ray Spectroscopy, Cyclic Voltammetry, Chronoamperometry, and Electrochemical Impedance Spectroscopy. The PdeCu/G compositional effect on ethanol oxidation in alkaline media is investigated. The results were shown that the catalytic activity and durability of PdeCu/G catalyst are superior to those of Pd/C electrocatalyst for ethanol oxidation. The PdeCu/G increased the current density 6.2 times more than Pd/C with a 50 mv negative shift in onset potential for electrooxidation of ethanol. Besides, the novel PdeCu/G catalyst exhibits large electrochemically active surface area, lower apparent activation energy, higher levels of stability, poisoning tolerance, and lower charge transfer resistance compared to the Pd/C for the oxidation of ethanol.
The dicopper-substituted γ-Keggin silicotungstate with bis-μ-1,1-azido ligands TBA4H2[γ-SiW10O36C... more The dicopper-substituted γ-Keggin silicotungstate with bis-μ-1,1-azido ligands TBA4H2[γ-SiW10O36Cu2(μ-1,1-N3)2] (TBA = tetrabutylammonium) could act as an effective homogeneous precatalyst for the ...
In this study, the electrochemical reduction reaction of copper(II) formate on the graphene/glass... more In this study, the electrochemical reduction reaction of copper(II) formate on the graphene/glassy carbon electrode (G/GCE) surface in the HCl (5 wt.%) was employed for fabrication of the Pdsingle bondCu nanostructures by galvanic displacement reaction. This method has a number of advantages including being environmentally-friendly, simplicity, inexpensiveness and fast. The Pdsingle bondCu nanostructures decorated on the G/GCE were fabricated in two steps: (1) electrochemical reduction reaction of copper(II) formate to Cu on the G/GCE and (2) the galvanic replacement reaction between Cu and Pd2+ ions. The physical and electrochemical properties of as-prepared Pdsingle bondCu/G were investigated via Field Emission Scanning Electron Microscopy, Energy Dispersive X-ray Spectroscopy, Cyclic Voltammetry, Chronoamperometry, and Electrochemical Impedance Spectroscopy. The Pdsingle bondCu/G compositional effect on ethanol oxidation in alkaline media is investigated. The results were shown that the catalytic activity and durability of Pdsingle bondCu/G catalyst are superior to those of Pd/C electrocatalyst for ethanol oxidation. The Pdsingle bondCu/G increased the current density 6.2 times more than Pd/C with a 50 mv negative shift in onset potential for electrooxidation of ethanol. Besides, the novel Pdsingle bondCu/G catalyst exhibits large electrochemically active surface area, lower apparent activation energy, higher levels of stability, poisoning tolerance, and lower charge transfer resistance compared to the Pd/C for the oxidation of ethanol.
Tetrahydrobenzo[b]pyran and 3,4-dihydropyrano[c]chromene derivatives were synthesized via a one-p... more Tetrahydrobenzo[b]pyran and 3,4-dihydropyrano[c]chromene derivatives were synthesized via a one-pot three-component condensation of aromatic aldehydes with malononitrile and dimedone or 4-hydroxycoumarin in excellent yields in the presence of starch solution as a highly efficient homogenous catalyst. The use of a nontoxic and biodegradable catalyst, simple work-up procedure, and short reaction time are advantages of this method.
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