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Title: Heat-insulating black electrochromic device enabled by reversible nickel-copper electrodeposition
Authors: Guo, Xiaoyu
Chen, Jingwei
Eh, Alice Lee-Sie
Poh, Wei Church
Jiang, Fan
Jiang, Feng
Chen, Juntong
Lee, Pooi See
Keywords: Engineering::Materials
Issue Date: 2022
Source: Guo, X., Chen, J., Eh, A. L., Poh, W. C., Jiang, F., Jiang, F., Chen, J. & Lee, P. S. (2022). Heat-insulating black electrochromic device enabled by reversible nickel-copper electrodeposition. ACS Applied Materials and Interfaces, 14(17), 20237-20246.
Project: 2021-T1-002-115
Journal: ACS Applied Materials and Interfaces 
Abstract: An electrochromic device (ECD), which can switch between black and transmissive states under electrical bias, is a promising candidate for smart windows due to its color neutrality and excellent durability. Most of the black ECDs are achieved through a reversible electrodeposition and dissolution mechanism; however, they typically suffer from relatively poor cycling stability and a slow coloration/bleaching time. Herein, we present a heat-insulating black ECD with a gel electrolyte that operates via reversible Ni-Cu electrodeposition and dissolution. With the adoption of a Cu alloying strategy and a compatible gel electrolyte, this two-electrode ECD (5.0 cm × 2.5 cm) can achieve a cycling stability of 1500 cycles with transmittance modulation up to 55.2% in short coloration (6.2 s) and bleaching times (13.2 s) at a wavelength of 550 nm. Additionally, the ECD can be switched from the transparent state (visible light transmittance: 0.566) to the opaque state (visible light transmittance: 0.003) within 1 min, reaching transmittance less than 5% across the visible-near-infrared spectrum (400-2000 nm) to efficiently block solar heat. Besides, in the voltage-off state, the black Ni-Cu alloy film can be sustained for more than 60 min (at room temperature, λ = 550 nm). Under infrared irradiation (170 W/m2) for 30 min, the black ECD blocks up to 35.0% of infrared radiation, which not only effectively prevents the heat transmission for energy management but also finds potential applications for promoting indoor human health and indoor farming.
ISSN: 1944-8244
DOI: 10.1021/acsami.2c02626
Rights: © 2022 American Chemical Society. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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