Improving Electrochromic Cycle Life of Prussian Blue by Acid Addition to the Electrolyte

Abstract

In this study, we examined the cyclic stability of Prussian blue (PB) films in electrolytes with acid. The cyclic stabilities of the PB films were investigated in K+ based electrolytes with different values of solution pH. The acidified KCl solution can significantly improve the durability of the film. Among the three pH values tested, the KCl solutions (pH = 2.15 and pH = 3.03) showed better performance. Furthermore, we investigated the cyclic stabilities of the PB films in LiClO4/PC electrolyte containing different acids. We found that the cyclic stability of PB film was significantly improved when a small amount of acetic acid was dissolved in LiClO4/PC electrolyte. The PB film exhibited stable optical modulation after up to 20,000 cycles in LiClO4/PC electrolyte containing acetic acid—a much higher result than those of some literatures. This suggests that the addition of acetic acid to LiClO4/PC electrolyte can promote the development of PB-based devices with improved stability.

Dual Tinting Dynamic Windows Using Reversible Metal Electrodeposition and Prussian Blue

“…EDX analysis of the electrode demonstrates that these particles are electrodeposited Bi metal (Figure S2). A SEM image of the Prussian blue counter electrode displays a platelet-like morphology similar to previously reported images, 24 and X-ray diffraction (XRD) analysis further confirms the presence of Prussian blue (Figure S3). Atomic force microscopy (AFM) images of the Prussian blue counter electrode display a similar morphology and show that the film is ∼150 nm thick (Figure S4).…”

Green Reduction of Cobalt Ferrocyanide with Excellent Electrocatalytic Activity toward the Oxygen Evolution Reaction

“…The field emission scanning electron microscopy (FESEM) image of RCFC-10 shows agglomerate spherical clusters with some cracks in between the spherical clusters (Figure ). The agglomerate spherical cluster morphology of RCFC-10 (synthesized using ascorbic acid reduction for 10 min) with a high surface area will enhance the electrocatalytic activity because of higher electron transportation during the OER process. , From the FE-SEM image, it was found that the agglomerate spherical shape particles have a size ranging from 80 to 100 nm. The energy-dispersive X-ray (EDX) spectra confirm the constituent elements, and the absence of other elements reveals the purity of the material.…”

Application of Prussian Blue in Electrochemical and Optical Sensing of Free Chlorine

“…Even though the cyclic voltammetry-based procedure ( Figure 2 ) appeared to be suitable to detect FCL by using the glass|FTO|PB sensor in a rather wide linear range from 1.7 to 41.5 μmol L −1 ( Figure 3 ) of FCL, the response of this sensor to FCL was found to be non-linear at concentrations higher than 41.5 μmol L −1 of FCL (data not presented). This decrement in sensitivity of the glass|FTO|PB sensor towards FCL could be related to the deterioration of PB electrochemical activity due to the repeated cycling of PB between oxidized (PB) and reduced (PW) forms [ 62 ]. Therefore, in our further experiments, the response of the glass|FTO|PB sensor to FCL was investigated by the means of chronoamperometry at a constant potential of avoiding cycling-caused degradation of the PB layer.…”