Rotating disk electrode is by far the most popular hydrodynamic electrode used for the kinetic studies of the chemical reactions. This is due to its great advantages, as a uniformly accessible electrode, makes it the most convenient for quantitative analysis. In our group, we are interested to study the mechanism of the enzymes using protein film voltammetry (PFV)¹ in which the enzyme is absorbed at the electrode surface of the rotating disk electrode, where the electron transfer is direct (Figure). CO dehydrogenase, CODH, is a promising enzyme, that catalyzes the reversible reaction of reduction of carbon dioxide into carbon monoxide: CO + H₂O ↔ CO₂ + 2e^- + 2H⁺, which is the first step to the production of fuel^2,3. With the classical setup using the rotating disk electrode, the transport of chemical species toward the enzyme is insufficient to match its very high activity; this blurs the enzymatic response and prevents mechanistic studies. To enhance the transport toward the active sites of the enzymes at the electrode, we design a new type of a flow cell. We use fluid mechanics simulation to study a variety of geometrical configurations, to choose a suitable prototype of electrochemical cell. Based on our numerical simulations, we build this cell and we perform the experimental studies.