A hydrophobic alloy-coated Zn anode for durable electrochromic devices

Hu, Jianwei; Zhang, Yingxin; Xu, Bing; Ouyang, Yujia; Ma, Yu; Wang, Huanlei; Chen, Jingwei; Li, Haizeng

doi:10.1039/d3cc05029g

Chem. Commun.

2024

DOI: 10.1039/d3cc05029g

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A hydrophobic alloy-coated Zn anode for durable electrochromic devices

Jianwei Hu,

Yingxin Zhang,

Bing Xu

et al.

Abstract: A hydrophobic CuZn5 alloy coating was introduced onto a Zn anode to improve the reversibility and stability. Such a hydrophobic alloy-coated Zn anode enabled the assembly of electrochromic devices with extended cycling stability and fast switching.

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Cited by 4 publications

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“…However, the Zn 2p 1/2 and Zn 2p 3/2 peaks exhibited a slight shift toward higher binding energies after plating for 5 s and remained relatively stable in the following extended plating. Such a binding energy shift is indicative of alloy formation due to the charge transfer between Zn and Cu atoms in the plated films. , Additionally, the intensity of Cu 2p peaks gradually decreased during extended plating, indicative of a reduced Cu content at the surface of the plated CuZn films. The Zn and Cu atomic percentages in the plated CuZn films were also quantified accordingly, showing a clearly increased Zn content (46.7%–97.2%) from the bottommost to the topmost surface.…”

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confidence: 99%

Color-Neutral Smart Window Enabled by Gradient Reversible Alloy Deposition

Zhang,

Xu,

Huang

et al. 2024

ACS Energy Lett.

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Reversible metal electrodeposition (RME)-based smart windows can realize large solar heat gain coefficient (SHGC) modulation, where Zn-RME emerges as an intriguing option with high theoretical coloration efficiency (CE), cost effectiveness, and color neutrality. Herein, Cu 2+ was selected as electrolyte additive to lower the activation energy and homogenize the electrical field distribution during metal plating, forming gradient CuZn alloy nanoparticles via reversible alloy electrodeposition (RAE). Compared to Zn-RME, the CuZn-RAE electrode can achieve extremely low transmittance (0.01%) and color neutrality (chroma C* = 5.8) within 2 min, large transmittance modulation (82%), fast switching times (t c = 8 s, t b = 18 s), higher CE, elevated memory effect, and extended cycling stability. Additionally, a tinted CuZn-RAE device can effectively block infrared heat and reduce surface temperature by 7.1 °C, and the insulating glass unit (IGU) modeled with a CuZn-RAE device offers large solar heat modulation with ΔSHGC of 0.448, showing great application potential toward dynamic smart windows.

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confidence: 99%

Color-Neutral Smart Window Enabled by Gradient Reversible Alloy Deposition

Zhang,

Xu,

Huang

et al. 2024

ACS Energy Lett.

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Recent advances in multifunctional electrochromic devices

Yu,

Guo,

Chen

et al. 2024

Responsive Materials

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Electrochromic (EC) technology has been regarded as a promising energy‐saving technology in various applications, including smart windows, displays, thermal management, rear views, etc. Benefiting from the progress in electrochromic material synthesis, electrochromic electrode fabrication, and electrochromic device configuration design, the focus in electrochromic community has gradually shifted to multifunctional electrochromic devices (ECDs) in the era of Internet of Things. Multifunctional ECDs, such as electrochromic energy storage devices, multi‐color displays, deformable ECDs, smart windows, etc. have been showcased the ability to expand potential applications. In this review, the available device configurations, performance indexes and advanced characterization techniques for multifunctional ECDs are introduced and classified accordingly. The applications of multifunctional ECDs for energy storage, multicolor displays, deformable devices, self‐chargeable devices, smart windows, actuators, etc., are exemplified. The future development trends and perspectives of multifunctional ECDs are also overlooked. The aim of this review is to guide and inspire further efforts in the exploration of novel and advanced multifunctional ECDs.

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Homogeneous and Nanogranular Prussian Blue to Enable Long-Term-Stable Electrochromic Devices

Fu,

Li,

Zhang

et al. 2024

ACS Appl. Mater. Interfaces

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The increasing demand for the state-of-the-art electrochromic devices has received great interest in synthesizing Prussian blue (PB) nanoparticles with a uniform diameter that exhibit excellent electrochromism, electrochemistry, and cyclability. Herein, we report the controllable synthesis of sub-100 nm PB nanoparticles via the coprecipitation method. The diameter of PB nanoparticles can be modulated by adjusting the reactant concentration, the selection of a chelator, and their purification. The self-assembled nanogranular thin films, homogeneously fabricated by using optimized PB nanoparticles with an average diameter of 50 nm as building blocks via the blade coating technique enable excellent performance with a large optical modulation of 80% and a high coloration efficiency of 417.79 cm 2 C −1 . It is also demonstrated by in situ and ex situ observations that the nanogranular PB thin films possess outstanding structural and electrochemical reversibility. Furthermore, such nanogranular PB thin films can enjoy the enhanced long-term cycling stability of the PB-WO 3 complementary electrochromic devices having a 91.4% optical contrast retention after 16,000 consecutive cycles. This work provides a newly and industrially compatible approach to producing a complementary electrochromic device with extraordinary durability for various practical applications.

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A hydrophobic alloy-coated Zn anode for durable electrochromic devices

Abstract: A hydrophobic CuZn5 alloy coating was introduced onto a Zn anode to improve the reversibility and stability. Such a hydrophobic alloy-coated Zn anode enabled the assembly of electrochromic devices with extended cycling stability and fast switching.

Cited by 4 publications

References 45 publications

Color-Neutral Smart Window Enabled by Gradient Reversible Alloy Deposition

Color-Neutral Smart Window Enabled by Gradient Reversible Alloy Deposition

Recent advances in multifunctional electrochromic devices

Homogeneous and Nanogranular Prussian Blue to Enable Long-Term-Stable Electrochromic Devices

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