TY - JOUR
T1 - Active catalysts of sonoelectrochemically prepared iron metal nanoparticles for the electroreduction of chloroacetates
AU - Saez, V
AU - Gonzalez-Garcia, J
AU - Marken, Frank
N1 - International Congress on Ultrasonics, ICU 2009. 11-17 January 2009. Santiago, Chile.
PY - 2010/1/1
Y1 - 2010/1/1
N2 - A new methodology for the sonoelectro-deposition and stripping of highly reactive iron at boron-doped diamond electrodes has been studied. In aqueous 1 M NH4F iron metal readily and reversibly electro-deposits onto boron-doped diamond electrodes. The effects of deposition potential, FeF6 3- concentration, deposition time, and mass transport are investigated and also the influence of power ultrasound (24 kHz, 8 Wcm -2). Scanning electron microscopy images of iron nanoparticles grown to typically 20-30 nm diameters 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 deposits at boron-doped diamond is investigated for the reductive dehalogenation of chloroacetate. 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 sonoelectrochemical methodology offers a novel, clean and very versatile electro-dehalogenation methodology. The role of fluoride in the surface electrochemistry of iron deserves further attention.
AB - A new methodology for the sonoelectro-deposition and stripping of highly reactive iron at boron-doped diamond electrodes has been studied. In aqueous 1 M NH4F iron metal readily and reversibly electro-deposits onto boron-doped diamond electrodes. The effects of deposition potential, FeF6 3- concentration, deposition time, and mass transport are investigated and also the influence of power ultrasound (24 kHz, 8 Wcm -2). Scanning electron microscopy images of iron nanoparticles grown to typically 20-30 nm diameters 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 deposits at boron-doped diamond is investigated for the reductive dehalogenation of chloroacetate. 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 sonoelectrochemical methodology offers a novel, clean and very versatile electro-dehalogenation methodology. The role of fluoride in the surface electrochemistry of iron deserves further attention.
UR - http://www.scopus.com/inward/record.url?scp=77951574387&partnerID=8YFLogxK
UR - http://dx.doi.org/10.1016/j.phpro.2010.01.015
U2 - 10.1016/j.phpro.2010.01.015
DO - 10.1016/j.phpro.2010.01.015
M3 - Article
SN - 1875-3884
VL - 3
SP - 105
EP - 109
JO - Physics Procedia
JF - Physics Procedia
IS - 1
T2 - International Congress on Ultrasonics, ICU 2009, January 11, 2009 - January 17, 2009
Y2 - 1 January 2010
ER -