A New Electrochemical Cell with uniformly Accessible Electrode to Study Fast Catalytic Reactions
Electrochemical studies of highly active enzymes using Protein Film Voltammetry can be hindered by mass transport limitations, when using the conventional Rotating disk electrode (RDE), which prompts for the design of new devices with improved transport properties. We used numerical simulations of computational fluid dynamics to design a new electrochemical cell based on the so-called "jet flow" design for the kinetic studies of enzymes that catalyze chemical reactions at the surface of an electrode. The new cell is characterized by a high, reliable and uniform mass transport over the electroactive part of its surface. We investigated the effects of the nozzle and the electrode diameters, the nozzle-electrode distance and the Reynolds number on the performance of the jet-electrode in the flow system. Through the optimization of the geometry of this jet electrode cell, we achieved a factor of 3 enhancement in transport compared to the Rotating disk electrode. We succeeded in constructing the designed electrode, characterized it using electrochemical techniques, and found excellent agreement between the transport properties deduced from the numerical simulations and those from the measurements.