Electrochromic-supercapacitors based on tungsten oxide and prussian blue

doi:10.19799/j.cnki.2095-4239.2021.0106

Abstract

Abstract:

The WO₃ is a typical cathodic electrochromic material, which colors in the reduction (cation intercalation) state and fades in the oxidation (cation deintercalation) state. However, Prussian blue (PB) is a typical anodic electrochromic material, which colors in the oxidation (cation de-intercalation) state and fades in the reduction (cation intercalation) state. The electrochromic-supercapacitor was constructed based on the WO₃ and PB films due to the matched color changes for WO₃ and PB films under different ion-storage states. The WO₃ and PB composite films were prepared on the surface of transparent conductive glasses using the pulsed laser deposition and electro-deposition methods. The symmetric electrochromic-supercapacitor was fabricated using WO₃ and PB composite films as electrodes. The results showed that the WO₃/PB composite film presents superior cycling stability with the areal capacitance retention of 83.8% after 200 cycles. In addition, the supercapacitor presents an optical contrast of 53.2% between the total coloring and bleaching states at 650 nm, which is ascribed to the synergetic color changes for WO₃ and PB films under different voltages. Such supercapacitor exhibits different color changes under different charge-discharge states; thus, realizing the indication of energy-storage states through color changes. Our work pushes the combination of electrochromism and energy storage, leading to the visualization of energy-storage states for supercapacitors.

Key words: electrochromic, supercapacitor, tungsten oxide, Prussian blue, bi-functional

CLC Number:

TQ 152

Zhijie BI, Ning ZHAO, Xiangxin GUO. Electrochromic-supercapacitors based on tungsten oxide and prussian blue[J]. Energy Storage Science and Technology, 2021, 10(3): 952-957.

Figures/Tables 4

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