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(a) Nonenhanced normal Raman spectrum and SERS spectra (at the open-circuit potential (OCP), 3.0 V, and the end of sweep, 0.5 V) of the LP40 electrolyte. (b) Operando SERS performed on nanostructured gold electrodes in LP40 electrolyte during potentiostatic steps (100 mV, 3.0 to 0.5 V).
