Abstract
Deep eutectic solvents (DESs), called a new generation of green solvents, have broad applied in synthesis of nanomaterials due to their remarkable physicochemical properties. In this work, we used a unique strategy (adding moderate water (10%) to DES) to effectively prepare nanomaterials. Flower-like AuPt alloy nanoparticles were successfully synthesized using one-step electrochemical reduction method at a low potential of −0.30 V (vs. Pt) and a low temperature of 30 °C. In this process, the DES acted as solvent and shape-directing agent. More importantly, we used the electrode modified with the as-prepared nanomaterials as the anode to the electrochemical oxidation synthesis. The glassy carbon electrode modified with the AuPt nanoflowers was directly employed to the electro-oxidation of xanthene (XT) to xanthone (XO) under a constant low potential of 0.80 V (vs. Ag/AgCl) and room temperature, with a high yield of XO. Moreover, the synthesis process was milder and more environment-friendly than conventional organic syntheses. This new strategy would have a promising application in electroorganic synthesis fields.
Highlights
Electroorganic synthesis has become an established, versatile and environment-friendly alternative to traditional organic synthesis for the oxidation/reduction of organic compounds[1,2,3,4,5]
We took the direct electro-oxidation of XT to XO as an example to explore the application of the electrode modified with nanomaterials in electroorganic synthesis
Deep eutectic solvents (DESs) as promising green solvents have been widely applied in nanoparticle synthesis, but high viscosity and melting point limited their application
Summary
The Au/Pt atomic composition determined by XPS analysis is 96.73/3.27, consistent with that from the EDS analysis These results confirm that the as-prepared alloy nanoparticles are composed of Au and Pt. XRD analysis was recorded to characterize chemical composition and crystal structure of the synthesized AuPt NFs. Figure 5 (curve a) shows that three dominant peaks at ca. AuPt alloy nanoparticles with different morphologies and sizes were prepared at different applied potentials from −0.30 to −2.00 V vs Pt in ethaline with 10% of water. The modified electrode (AuPt NFs/GCE) could be directly applied to the electrochemical oxidation synthesis of XO. When the applied potential was above 1.60 V vs Ag/AgCl, the AuPt nanoparticles on the AuPt NFs/GCE were oxidized, leading to inactivating of the electrode. H2O in cathodic zone serves as an electron acceptor to generate H2 in the cathodic process[15]
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