کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7834420 | 1503528 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The improvement of SiO2 nanotubes electrochemical behavior by hydrogen atmosphere thermal treatment
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: The improvement of SiO2 nanotubes electrochemical behavior by hydrogen atmosphere thermal treatment The improvement of SiO2 nanotubes electrochemical behavior by hydrogen atmosphere thermal treatment](/preview/png/7834420.png)
چکیده انگلیسی
Highly defected SiO2 nanotubes (SiO2-NT) were obtained by a simple sol-gel procedure followed by calcination. Boron-doped diamond (BDD) polycrystalline films coated with SiO2-NT were used as working electrodes and, unexpectedly, cyclic voltammetric experiments have shown that the concentration of both positive and negative defects at the surface is high enough to enable redox processes involving positively charged Ru(bpy)32+/3+ to occur. Conversely, no electrochemical activity was put into evidence for Fe(CN)63â/4â species, most likely as a result of the strong electrostatic repulsion exerted by the negatively charged SiO2 surface. The concentration of surface defects was further increased by a subsequent thermal treatment in a hydrogen atmosphere which, as EIS measurements have shown, significantly promotes Ru(bpy)32+ anodic oxidation. Digital simulation of the voltammetric responses demonstrated that this treatment does not lead to a similar increase of the number of electron-donor sites. It was also found that methanol anodic oxidation at hydrogenated SiO2-NT-supported platinum results in Tafel slopes of 116-220â¯mV decadeâ1, comparable to those reported for both conventional PtRu and Pt-oxide catalysts.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Applied Surface Science - Volume 444, 30 June 2018, Pages 216-223
Journal: Applied Surface Science - Volume 444, 30 June 2018, Pages 216-223
نویسندگان
Nicolae Spataru, Crina Anastasescu, Mihai Marian Radu, Ioan Balint, Catalin Negrila, Tanta Spataru, Akira Fujishima,