کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4766486 | 1423979 | 2017 | 16 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Adsorption of 2,2â²-bipyridine at an Au(111)|ionic liquid electrified interface
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Adsorption of 2,2â²-bipyridine at an Au(111)|ionic liquid electrified interface Adsorption of 2,2â²-bipyridine at an Au(111)|ionic liquid electrified interface](/preview/png/4766486.png)
چکیده انگلیسی
The adsorption of added 2,2â²-bipyridine (2,2â²-BP) from 1-ethyl-2,3-dimethyl imidazolium bis(trifluoromethanesulfonyl)imide (EMMImNTf2) at an Au(111) electrode has been investigated using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Addition of 2,2â²-BP to the ionic liquid clearly modifies the interfacial region as a result of the competition between 2,2â²-BP and EMMImNTf2 to occupy the electrode surface. Within the region of ideal polarizability, the 2,2â²-BP adlayer undergoes structural changes, shown by the presence of peaks in the CV curves. Between â0.2 V and + 0.9 V, the capacitance-potential curves obtained from EIS data present a capacity maximum depending strongly on the ac frequency, which is typical pseudo-capacitive behavior indicative of a reorganization of the interfacial layer. At more positive potentials a true capacity value close to 10 μF.cmâ 2 and invariant with the potential suggests that the 2,2â²-BP molecules adopt a perpendicular orientation with the nitrogen atoms facing the electrode surface, similar to their adsorption on gold from aqueous solutions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochemistry Communications - Volume 78, May 2017, Pages 56-59
Journal: Electrochemistry Communications - Volume 78, May 2017, Pages 56-59
نویسندگان
Liis Siinor, Carolin Siimenson, Thomas Doneux, Claudine Buess-Herman,