https://scholars.lib.ntu.edu.tw/handle/123456789/408663
標題: | Electrochemical fabrication of dendritic silver¡Vcopper bimetallic nanomaterials in protic ionic liquid for electrocarboxylation | 作者: | Rajagopal V. Velayutham D. Suryanarayanan V. Kathiresan M. Ho K.C. |
關鍵字: | Bimetallic nanocomposites;Carbanion;Electrocarboxylation;Electroreduction;Ketone;Triethylammonium acetate | 公開日期: | 2018 | 卷: | 87 | 起(迄)頁: | 158-164 | 來源出版物: | Journal of the Taiwan Institute of Chemical Engineers | 摘要: | 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 |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/408663 | ISSN: | 18761070 | DOI: | 10.1016/j.jtice.2018.03.030 |
顯示於: | 化學工程學系 |
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