Simultaneous EQCM and ring-disk measurements in AC regime application to copper dissolution

A novel experimental equipment is described allowing one to perform, simult aneously and on the same electrode, ring-disk and quartz crystal microbalan ce measurements. Owing to the use of a still electrode and an impinging-jet cell the uniform accessibility is preserved while the critical problems of connections to a rotating quartz are overcome. The capability of the devic e was illustrated by an ac investigation of copper dissolution in a NaCl, H NaCO3 medium. Impedance, complex collection efficiency, and electrogravimet ric transfer function were associated for elucidating unambiguously from ma ss and faradaic charge data the nature of the surface intermediate during c opper dissolution. (C) 2000 The Electrochemical Society. S1099-0062(00)03-0 05-4. All rights reserved.