Sonoelectrochemistry at platinum and boron-doped diamond electrodes: achieving 'fast mass transport' for 'slow diffusers'

It is demonstrated for electrochemical processes in aqueous solution enhanc ed by ultrasound from a glass-horn transducer (24 kHz, 8 W cm (- 2)) that t he mass transport limited current is essentially independent of the diffusi on coefficient. An explanation is proposed for this phenomenon, which allow s, at low ultrasound power, considerable enhancements of the mass transport of 'slow diffusers' with small D, to be achieved via interfacial cavitatio n. An application of this effect in the anodic destruction of an aqueous Pr ocion Blue dye solution at boron-doped diamond electrodes is discussed. (C) 2001 Elsevier Science B.V. All rights reserved.