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(i) A histogram of the magnitude of the mean electrocatalytic O2 peak current obtained from recorded cyclic voltammograms of the first and second cycle (filtered generated from solutions of raw Vale/canal water samples (n=3)). (ii) A histogram of the mean percentage electrocatalytic O2 peak current drop between first cycle and second cycle of the logged cyclic voltammograms (water control (n=2), filtered and raw Vale/canal water samples (n=3)) (±1 SD).
