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Flexible Inorganic All-Solid-State Electrochromic Devices toward Visual Energy Storage and Two-Dimensional Color
Yilin Ding1, Mengying Wang1, Zheyue Mei1
1Beihang University, Beijing 102206, China.
ACS Applied Materials & Interfaces
|March 17, 2023
Summary
Researchers developed a flexible, all-solid-state inorganic multicolor electrochromic energy storage device (MEESD). This device integrates Prussian blue and MnO2 electrodes, offering stable performance, multicolor display, and efficient energy storage with visual energy monitoring.
Area of Science:
- Materials Science
- Electrochemistry
- Energy Storage
Background:
- Multicolor displays are increasingly desired for electrochromic devices.
- Inorganic electrochromic devices offer stable performance and energy storage but typically lack multicolor capabilities.
- Existing inorganic materials struggle with multicolor transformation due to single-hue changes.
Purpose of the Study:
- To design and demonstrate an inorganic, flexible, all-solid-state multicolor electrochromic energy storage device (MEESD).
- To integrate Prussian blue (PB) and Manganese dioxide (MnO2) as asymmetrical electrodes for enhanced functionality.
- To evaluate the device's performance as both an electrochromic display and an energy storage system.
Main Methods:
- Fabrication of a flexible, all-solid-state MEESD using Prussian blue and MnO2 asymmetrical electrodes.
- Electrochemical characterization to assess pseudocapacitance, charge capacity, and stability.
- Optical and electrochromic performance testing, including response time and coloration efficiency.
- Evaluation of energy storage capabilities, including rate capability and volumetric energy/power density.
Main Results:
- The MEESD demonstrated a fast response time of 0.5 s and a coloration efficiency of 144.2 cm²/C.
- Excellent rate capability and high volumetric energy/power density (84.2 mWh cm⁻³/23.3 W cm⁻³) were achieved.
- The device exhibited a wide optical modulation of 40% at 710 nm, with color changes from yellow to green to blue during operation.
- Detailed analysis of stability in common and humid environments confirmed its robustness.
Conclusions:
- The developed MEESD successfully integrates inorganic, flexible, all-solid-state, multicolor, and energy storage properties.
- The device offers a novel platform for visual energy monitoring through color changes.
- This work presents a feasible approach for creating multifunctional electrochromic devices.
