Au electrodes 2 Au surfaces 2 Basic solutions 2 Composite films 2 Cyclic voltammetry 2 Electrocatalysis 2 Electrocatalysts 2 Electrocatalytic activity 2 Electrochemical behaviors 2 Electrochemical electrodes 2 FT-IR-ATR 2 Film electrodes 2 Gold 2 Initial loss 2 Ion exchange 2 Keggin structure 2 Layer-by-layer 2 Layer-by-layers 2 Modified electrodes 2 Molecules 2 Multilayer films 2 Novel strategies 2 PH-dependent 2 PMo12O403 2 Peak potentials 2 Peroxodisulfate 2 Photoelectrons 2 Polyoxomolybdate 2 Polyoxomolybdates 2 Redox process 2