Electrochemistry of powder material studied by means of the cavity microelectrode (CME)

The kinetic aspects of powder material electrochemistry can be studied usin g the cavity microelectrode (CME) as it allows carrying out voltammetry at scan rates between a few millivolts per second to several hundreds of volts per second. Thus, significant voltammogram characteristics-scan rate profi les can be drawn. Theoretical models suited to each material needs to be de veloped for their exploitation. First, we report significant results obtain ed with CME on powder materials. The materials studied were chosen for thei r wide variety of possible applications such as battery materials (polyanil ine or Bi2O3, which modifies the electrochemical behavior of materials in w hich it is included), supercapacitor (carbon black), and for the electrocat alytic hydrogenation of organic compounds (PtO2). Secondly, we briefly desc ribe the general action for establishing models to obtain a better understa nding of the electrochemical processes. (C) 2001 Elsevier Science Ltd. All rights reserved.