Abstract
Two heteropoly acids, phosphotungstic acid (PWA) and silicotungstic acid (SiWA), were studied as aqueous electrolytes for applications on electrochemical storage devices. Their performance was compared to the H 2 SO 4 benchmark with respect to both double-layer and pseudocapacitance using cyclic voltammetry, electrochemical impedance spectroscopy, and self-discharge measurements. Both heteropoly acids showed a very good proton conductivity in aqueous solutions, with overall performance comparable to H 2 SO 4 . Therefore, in spite of their electrochemical active nature, PWA and SiWA are feasible as electrolytes provided the operation window is chosen appropriately.
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