کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
181902 459412 2007 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Electro-deposition and stripping of catalytically active iron metal nanoparticles at boron-doped diamond electrodes
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
Electro-deposition and stripping of catalytically active iron metal nanoparticles at boron-doped diamond electrodes
چکیده انگلیسی

A new methodology for the electro-deposition and stripping of highly reactive iron nanoparticles at boron-doped diamond electrodes is proposed. In aqueous 1 M NH4F iron metal readily and reversibly electro-deposits onto boron-doped diamond electrodes. The effects of deposition potential, FeF63- concentration, deposition time, and mass transport are investigated. Power ultrasound (24 kHz, 8 W cm−2) is employed to achieve enhanced mass transport conditions. Scanning electron microscopy images of iron nanoparticles grown to typically 20–30 nm diameter are obtained. It is shown that a strongly and permanently adhering film of iron at boron-doped diamond can be formed and transferred into other solution environments.The catalytic reactivity of iron nanoparticle deposits at boron-doped diamond is investigated for the reductive dehalogenation of trichloroacetate. The kinetically limited multi-electron reduction of trichloroacetate is dependent on the FeF63- deposition conditions and the solution composition. It is demonstrated that a stepwise iron catalysed dechlorination via dichloroacetate and monochloroacetate to acetate is feasible. This methodology in conjunction with power ultrasound offers a novel, clean, and very versatile electro-dehalogenation methodology. The role of fluoride in the surface electrochemistry of iron deserves further attention.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Electrochemistry Communications - Volume 9, Issue 5, May 2007, Pages 1127–1133
نویسندگان
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