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Schematic detection scheme using (A) a thin-film IrOx electrode or (B) free-standing CVD bilayer graphene electrode decorated with IrOx NPs. Spectra comparison at different potentials (OCV and OER at −1.6 V vs Ag/AgCl) for the (C) thin-film IrOx electrode (20 nm) and free-standing CVD bilayered graphene (BLG) electrode decorated with IrOx 2.5 nm NPs.
