The titanium monolithic electrode was purchased from Kunshan Guangjiayuan New Material Co., Ltd., China. Iron chloride (FeCl3·6H2O), potassium sodium tartrate (KNaC4H6O6), DMSO–d6, maleic acid (C4H4O4), sodium nitrate (NaNO3), potassium hydroxide (KOH), potassium nitrate (K15NO3) and ethanol were purchased from Sinopharm Chemical Regent Company. All chemicals were used without further purification.
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