Lithium-Ion-Assisted Ultrafast Charging Double-Electrode Smart Windows with Energy Storage and Display Applications

Abstract

Lithium-ion-assisted ultrafast charging double-electrode smart windows with energy storage and a fluorescence display device (FTO/PB/Ru@SiO 2 ||Ru@SiO 2 /WO/FTO) based on double electrochromic electrodes (cathode and anode) (FSDECEs) have been designed and fabricated. Here, Prussian blue (PB) and WO red are selected as the electrochromic cathode and anode, respectively. There is a synergistic effect and a large potential difference between the two electrodes. They could be simultaneously and rapidly bleached after being connected with each other. Also, the fluorescence intensity of Ru@SiO 2 nanoparticles (NPs) could be regulated by the fluorescence resonance energy transfer effect (FRET). After discharging, the two electrochromic electrodes in the bleached state can be recharged by a Mg–O 2 battery with a FeN 5 single atomic catalyst to quickly recover the colored state. The double electrochromic electrodes can reversibly alter between coloring and bleaching states only by connecting and disconnecting the electrodes. The fluorescence intensity of FSDECEs can switch between quenching and emission, thus endowing the “on” and “off” functions. The system is concise, environmentally friendly, and easy to operate. The proposed FSDECEs demonstrate high fluorescence contrast, a fast response time, and long-term stability. Such an ingenious design of fluorescence switching based on the double electrochromic electrode in a single cell sheds light on next-generation transparent, portable, and self-powered electrochromic devices and electronic equipment.

Tunable Intracrystal Cavity in Tungsten Bronze‐Like Bimetallic Oxides for Electrochromic Energy Storage

“…It is highly desirable to develop a dual-function energy storage indicator by integrating electrochromic and energy storage functions into a single electrode, in which the level of stored energy can be displayed by a noticeable color change. [45][46][47][48] In order to illustrate this concept, we measured the galvanostatic charge-discharge profiles and the corresponding transmittance spectrum at different current densities (Figure 5b,c and Figure S15: Supporting Information). The color of the Nb 18 W 16 O 93 film changes from transparent to dark blue during the charging process.…”

Throwing Light on Next-Generation Electrochromic Energy Storage Smart Windows

“…In this issue of ACS Central Science , Dong et al report lithium-ion-assisted, ultrafast charging, double-electrode smart windows with energy storage and display applications. This work opens the gates to next-generation electrochromic energy storage and smart windows …”

“…(e) Real-time fluorescence intensity variations of the FSDECEs with time by connecting and disconnecting the electrodes. Reproduced with permission from ref ( 1 ). Copyright 2020 American Chemical Society.…”

“…This work opens the gates to nextgeneration electrochromic energy storage and smart windows. 1 There has been a growing interest in low-energy consumption and self-powered electrochromic energy storage devices. Transparent electrochromic windows have the ability to persistently and reversibly change their optical and electrical properties under the influence of an electrical voltage.…”

Potential Gradient-Driven Fast-Switching Electrochromic Device

“…14 Dong et al further developed a self-powered EC device with double-electrochromic-electrodes that can discharge by only connecting the two electrodes and charge by an Mg−O 2 battery, but also confused by the complex structure of integration. 15 All in all, it seems that there is no strategy that can achieve both high performance and universality in an all- in-one structure design for self-powered EC devices. Thus, the development of a unique strategy that can construct highly reversible fast-self-switching EC devices with a simplified configuration is necessary.…”