Electrochemical and geometrical characterization of iridium oxide electrodes in stainless steel substrate

Article

Authorship

Mayorga Martinez, Carmen Clotilde ; MADRID, ROSSANA ELENA ; FELICE, CARMELO JOSE

Date

2008

Publishing House and Editing Place

Elsevier Science Sa

Magazine

SENSORS AND ACTUATORS B-CHEMICAL, vol. 133 (pp. 682-686) Elsevier Science Sa

Summary Information provided by the agent in SIGEVA

A geometrical and electrochemical characterization of stainless steel electrodes electrodeposited with iridium oxide (IrO2) is presented. There is a dramatic increase in the double layer capacitance (C) and an important decrease in the charge transfer resistance (Rct) after electrodeposition, causing also a significant two orders of magnitude reduction of the electrode-electrolyte interface impedance (EEIZ). These phenomena may be explained by the fine-grained iridium oxide, which has a high gr... A geometrical and electrochemical characterization of stainless steel electrodes electrodeposited with iridium oxide (IrO2) is presented. There is a dramatic increase in the double layer capacitance (C) and an important decrease in the charge transfer resistance (Rct) after electrodeposition, causing also a significant two orders of magnitude reduction of the electrode-electrolyte interface impedance (EEIZ). These phenomena may be explained by the fine-grained iridium oxide, which has a high grain boundary density and which increases the actual electrodic area. An RC model is presented, which would explain the electrical behaviour of the system.