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QCM electrochemistry on a 15 layer PEMU (PEI(PAA/PVBV)7), upper panel, and 16 layer (PEI(PAA/PVBV)7PAA), lower panel, PEMU. Shown are the frequency and dissipation changes of the 3rd harmonic versus potential. The scan rate is 0.5 mV/s. Potentials versus SCE.
