کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
220527 | 463337 | 2008 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Electrodeposition of silver from the ‘distillable’ ionic liquid, DIMCARB in the absence and presence of chemically induced nanoparticle formation Electrodeposition of silver from the ‘distillable’ ionic liquid, DIMCARB in the absence and presence of chemically induced nanoparticle formation](/preview/png/220527.png)
The reduction of Ag+ to Ag0 has been studied electrochemically at glassy carbon electrodes using the techniques of cyclic voltammetry and chronoamperometry. Ag+ is known to be chemically reduced to form Ag0 nanoparticles by moieties present in the ‘distillable’ room temperature ionic liquid, DIMCARB (synthesised from Me2NH and CO2 in a 1.8:1 ratio) which is defined by the following equilibria: CO2 + Me2NH ↔ Me2NHCOOH + Me2NH ↔ [Me2NH2]+[Me2NCOO]−. At short reaction times in DIMCARB and when the contribution of the chemical reaction is small, Ag+ is electrochemically reduced to Ag0 and deposited onto a glassy carbon electrode via a progressive nucleation and growth mechanism. At long reaction times, when Ag0 nanoparticles are present and become attached to the glassy carbon surface, Ag+ also is electrochemically reduced and deposited via a 2D–2D nucleation and growth mechanism onto Ag nanoparticles attached to the electrode surface. Images obtained during the course of the electrodeposition reaction by atomic force microscopy reveal that a compact film of Ag also is deposited onto glassy carbon in the presence of nanoparticles. Calculation of the diffusion coefficient of Ag+ in DIMCARB is complicated by the chemical formation of Ag0 but is estimated to lie in the range of 2.1–3.0 × 10−7 cm2 s−1.
Journal: Journal of Electroanalytical Chemistry - Volumes 619–620, 15 July 2008, Pages 1–10