Electro-deposition and stripping of catalytically active iron metal nanoparticles at boron-doped diamond electrodes

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• 作者：Veronica Saez ; Jose Gonzalez-Garcia ; M. Anbu Kul ; ainathan ; Frank Marken
• 关键词：Iron ; Nanoparticle ; Boron-doped diamond ; Dehalogenation ; Remediation ; Ultrasound ; Sonoelectrochemistry ; Catalysis
• 刊名：Electrochemistry Communications
• 出版年：2007
• 期刊代码：29_13882481
• 类别：ch
• 出版时间：May 2007
• 卷：9
• 期：5
• 页码：1127-1133
• 文件大小：864 K

摘要

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, 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 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.