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(A) Cyclic voltammograms and (B) Nyquist plots of (a) the GSH-modified electrode before being treated with the Fenton reagent, (b) after being treated with the Fenton reagent, and (c) after regenerated by NADPH and GR in 5 mM solution of [Fe(CN)6]3−/4− containing 0.1 M KCl.
