Abstract
Electrochemical quartz crystal microbalance (EQCM) measurements in solutions of K 3 Fe(CN) 6 or K 4 Fe(CN) 6 reveal a significant frequency response due to changes in the density (ρ) and viscosity (η) of the depletion layer during cyclic voltammetric experiments. Frequency shifts exceeding 15 Hz are obtained with a 5-MHz AT-cut quartz crystal during the voltammetric oxidation of 100 mM Fe(CN) 6 4- (or reduction of Fe(CN) 6 3- ) in 1.0 M Na 2 SO 4 solutions
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