کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
189310 459678 2012 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electrodeposition of iridium onto glassy carbon and platinum electrodes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Electrodeposition of iridium onto glassy carbon and platinum electrodes
چکیده انگلیسی

The mechanism for the electrodeposition of iridium onto glassy carbon and platinum substrates has been investigated. Iridium coatings were characterized by X-ray photoelectron microscopy to determine their chemical compositions and the morphologies of deposits were observed by scanning electron microscopy. The deposition of iridium on glassy carbon electrodes requires, in a first stage, the formation of Ir surface sites. These sites, generated by reduction of Ir3+ ions for large overpotential, allow the adsorption of H atoms which act as the reducing agent for Ir3+ ions. In contrast, on platinum, Ir electrodeposition occurs readily due to a high Hads surface coverage. The optimal Hads surface coverage for the electrodeposition of Ir on Pt is close to 0.5. Electrochemical quartz crystal microbalance measurements demonstrated that the Faradaic efficiency of Ir deposition on Pt is very low (0.2–1.7%).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochimica Acta - Volume 59, 1 January 2012, Pages 49–56
نویسندگان
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