Using a new developed hardware system and optimized electrochemistry chips with a specialized configuration of working electrode (WE), counter electrode (CE) and reference electrode (RE), we performed cyclic voltammetry studies in a model 20 mM K3(Fe(CN)6/20 mM K4Fe(CN)6 in 0.1M KCl solutions. The redox reaction of 20 mM ferrocyanide/ 20 mM ferricyanide in 0.1M KCl at different voltage scans show reversible electrode reaction during both the forward and reverse scans, elucidating bulk behavior. The corresponding electrochemical impedance spectroscopy (EIS) measurements shows lower capacitive current, and better signal-to-noise ratio with the lower concentration of solution. These results demonstrate the capability of the new Generation V liquid-electrochemistry holder for allowing small volume and limited diffusion cell geometries to mimic bulk data, which can be implemented in the quantitative measurements of broader electrochemical systems.
Left image: Top shows CV cycle performed at various potential scan rates – 20 mV/s and 100 mV/s. Bottom shows the corresponding EIS spectrum.
HBS internal data obtained in collaboration with William C. Chueh group at Stanford University.