Large‐Scale Fabrication of Pseudocapacitive Glass Windows that Combine Electrochromism and Energy Storage

Abstract

Multifunctional glass windows that combine energy storage and electrochromism have been obtained by facile thermal evaporation and electrodeposition methods. For example, WO3 films that had been deposited on fluorine-doped tin oxide (FTO) glass exhibited a high specific capacitance of 639.8 F g(-1). Their color changed from transparent to deep blue with an abrupt decrease in optical transmittance from 91.3% to 15.1% at a wavelength of 633 nm when a voltage of -0.6 V (vs. Ag/AgCl) was applied, demonstrating its excellent energy-storage and electrochromism properties. As a second example, a polyaniline-based pseudocapacitive glass was also developed, and its color can change from green to blue. A large-scale pseudocapacitive WO3-based glass window (15×15 cm(2)) was fabricated as a prototype. Such smart pseudocapacitive glass windows show great potential in functioning as electrochromic windows and concurrently powering electronic devices, such as mobile phones or laptops.

Quantitative Analysis of Charge Storage Process of Tungsten Oxide that Combines Pseudocapacitive and Electrochromic Properties

“…Very recently, WO 3 has been demonstrated very interesting and promising bifunctionalities that combine electrochromism and pseudocapacitance. 29,30 Deeper understanding of the pseudocapacitance of WO 3 is needed to develop what we refer to as "electrochromic supercapacitors" with better performance.…”

Freestanding CNT–WO3hybrid electrodes for flexible asymmetric supercapacitors

“…4a) reveals the existence of elements C, O, W and Cu, where the Cu signal originates from the TEM copper grid. 27 The electrochemical properties of the as-prepared CNT and CNT-WO 3 electrodes were studied using a three-electrode conguration with an Ag/AgCl electrode as the reference electrode, a graphite rod as the counter electrode, and 1 M H 2 SO 4 aqueous solution as the electrolyte. 4b.…”

“…25 Liang et al revealed ultrathin WO 3 nanosheets and used them to fabricate exible electrochromic devices. 27 The problem of the relatively low energy density of the assembled SC device is critical. 27 The problem of the relatively low energy density of the assembled SC device is critical.…”

Electrochromic energy storage devices

“…For instance, Yang et al designed multifunctional glass windows that combine energy storage and electrochromism using WO 3 film electrodes which were obtained by facile thermal evaporation method (Fig. 5a-c) [50]. These WO 3 films exhibited a high specific capacitance of 639.8 F g À1 .…”