We investigated anodic copper dissolution (electropolishing) in phosphoric acid in an epoxy-based microchip flow cell. The cell was constructed by reversible sealing of a poly (dimethylsiloxane) chip with a 0.1mm height and 0.2mm width flow channel over a 0.1mm diameter Cu wire embedded in an epoxy resin. With the application of proper external resistance, flow rate, and circuit potential, the electrodissolution of copper in the microcell displayed periodic smooth and relaxation oscillations as well as complex waveforms with mixed mode and chaotic oscillations. These experiments reproduced the dynamical features of the negative differential resistance electrochemical system previously characterized in macrocell configuration.

Periodic and complex waveform current oscillations of copper electrodissolution in phosphoric acid in an epoxy-based microchip flow cell

243rd National Meeting (2012)

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