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(A) FT-IR spectra of the APGE and APGE/PTH, (B) electrochemical CV response of different electrodes in 5 mmol/L of K3/4[Fe(CN)6] in 0.1 M KCl with scan rate of 50 mV/s and (C) EIS response of the different electrodes in 5 mmol/L of K3/4[Fe(CN)6] in 0.1 M KCl at Eapp is 0.18 V vs. Ag/AgCl (inset figure, Randles equivalent circuit).
