Electrosynthèse des ions peroxodiphosphate sous potentiel constant ou pulsé

摘要: Electrosynthesis of peroxodiphosphate ions (P2O84−) was performed in 2m K3PO4, 1m K2HPO4 medium, using a platinum anode. The results showed that under conditions potentiostatic polarization at constant potential, the reaction rate reaches maximum value 125mAcm−2 and faradaic yield 30%. From about 1.9V, kinetics are increasingly inhibited as potential shifts positively. Rapid scanning voltammetry used to characterize oxidation state electrode surface. This method shows growth α (PtO) β (PtO2 or PtO3) oxides depend on applied potential. It also establishes correlation between inhibition P2O84− ion electrosynthesis oxide coating When 2×10−3m KSCN is added solution, some oxygen evolution sites selectively blocked occurs more positive values. Consequently, formation efficiency increased 380mAcm−2 75%, respectively. Under pulsed it possible reach 1200mAcm−2 for with 82%.