Electrochemical fabrication of dendritic silver¡Vcopper bimetallic nanomaterials in protic ionic liquid for electrocarboxylation
Journal
Journal of the Taiwan Institute of Chemical Engineers
Journal Volume
87
Pages
158-164
Date Issued
2018
Author(s)
Abstract
Silver (Ag) and silver¡Vcopper (Ag¡VCu) bimetallic composite electrodes were electrochemically prepared on a glassy carbon (GC) substrate in triethylammonium acetate (TEAA) by electrodeposition to investigate their suitability as cathodes for electrocarboxylation process. Cyclic voltammetric investigations reveal that with increase in Cu content, both the stripping as well as deposition current of Ag (I) ions decrease with a shift of cathodic and anodic peak potential in the positive side, where the onset deposition potential difference between Cu and Ag ions becomes less, favouring effective co-deposition of both ionic species. The morphologies of deposits change significantly from cubic structure to flower-shaped dendrites by the incorporation of more amount of Cu, as noted from scanning electron microscopy (SEM) images. Crystallographic (XRD) analysis confirms the formation of Ag¡VCu co-deposits and the compositions of the different deposits were found out using atomic absorption spectroscopy (AAS). The Ag¡VCu composite containing 23% of Cu (Ag77¡VCu23) shows the highest cathodic potential window in N,N-dimethylformamide/tetrabutylammonium tetrafluoroborate (DMF/TBABF4) medium. Further, Ag77¡VCu23 shows higher reductive current on the electroreduction of benzophenone in presence and absence of carbon dioxide than that of other Ag based composite electrodes resulting in an enhancement of the product yield. ? 2018 Taiwan Institute of Chemical Engineers
Subjects
Bimetallic nanocomposites
Carbanion
Electrocarboxylation
Electroreduction
Ketone
Triethylammonium acetate
Type
journal article