Prototypical nonelectrochemical method for surface regeneration of an integrated electrode in a PDMS microfluidic chip

A prototypical method for surface regeneration of an integrated electrode in a microfluidic chip is demonstrated. A platinum wire as working electrode was mounted in a polydimethylsiloxane chip vertical to the chip through the channel. The regeneration of the electrode was easily achieved by drawing the platinum wire out for 5 mm, because the area exposed to the channel or the stream would be altered. With continuous motion, the wire electrode can maintain a fresh surface just like a dropping mercury electrode. The current-time curve and open circuit potential (OCP) of dopamine solution show the performance of this prototypical system.