کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6618242 | 459654 | 2012 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
In situ STM, AFM and DTS study of the interface 1-hexyl-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate/Au(1Â 1Â 1)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
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چکیده انگلیسی
The Au(1Â 1Â 1)/1-hexyl-3-methylimidazolium tris(pentafluoroethyl)trifluorophosphate ([HMIm]FAP) interface is examined using in situ scanning tunnelling microscopy (STM), atomic force microscopy (AFM) and distance tunnelling spectroscopy (DTS). Both in situ STM and AFM results reveal that multiple ionic liquid (IL) interfacial layers form at the Au(1Â 1Â 1) electrode interface. The applied potential determines whether cations (cathodic regime) or anions (anodic regime) are preferentially adsorbed to the substrate, with stronger near surface layering detected at higher surface potentials. DTS measurements suggest that the height of the tunnelling barrier between the STM tip and the gold substrate was 1.4Â eV at open circuit potential (ocp). The IL double layer structure elucidated is not consistent with Stern-Gouy-Chapman model as per aqueous electrolyte systems due to the absence of a diffuse layer. Instead a capacitor-like structure is present with the potential decaying sinusoidally over the oscillatory ion arrangements.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 82, 1 November 2012, Pages 48-59
Journal: Electrochimica Acta - Volume 82, 1 November 2012, Pages 48-59
نویسندگان
Timo Carstens, Robert Hayes, Sherif Zein El Abedin, Brendan Corr, Grant B. Webber, Natalia Borisenko, Rob Atkin, Frank Endres,