Reversible electrochemical mirror devices
Reversible electrochemical mirror (REM) electrochromic devices with merits of various optical states, facile device assembly, and cost effectiveness are attractive alternatives to conventional electrochromic devices. Current REM works are dominated by Ag metal, which is highly costly, poor cycli...
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2021
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sg-ntu-dr.10356-1466262021-04-20T07:00:34Z Reversible electrochemical mirror devices Eh, Alice Lee Sie Lee Pooi See School of Materials Science and Engineering PSLee@ntu.edu.sg Engineering::Materials Reversible electrochemical mirror (REM) electrochromic devices with merits of various optical states, facile device assembly, and cost effectiveness are attractive alternatives to conventional electrochromic devices. Current REM works are dominated by Ag metal, which is highly costly, poor cycling stability in the reflectance mode, and slower switching speed. This thesis hypothesized that by judiciously selecting the electrolyte components and understanding the electrochemistry of Cu deposition and dissolution, Cu REM can be realized. As an electrochemically active material, Cu can be electrochemically tuned to achieve different redox states with controlled electrical bias. By controlling the different redox states of Cu, various optical states can be attained in the REMs. The current bottleneck in REM is the poor durability in the reflectance mode. The pure Cu REM functions based on Cu metal electrodeposition and dissolution, of which the reversibility may not be satisfactory without the assistance of an alloying element. With the incorporation of an alloying element, it could assist in the electrochemical deposition and dissolution of Cu and hence, promote reversibility. From the kinetics study, the electrochemical deposition of CuSn film is relatively fast. Sn serves to provide a nucleation layer during electrodeposition as validated using Johnson–Mehl–Avrami–Kolmogorov (JMAK) analysis. Furthermore, a hybridization approach, with its well-tailored electrolyte combination and optimization, has been designed for development of high-performance and safe REM electrolyte. The established electrolyte delivers superior electrochemical behavior, stability, current efficiency, and ionic conductivity of the hybrid electrolyte compared to aqueous and non-aqueous electrolytes. Doctor of Philosophy 2021-03-03T06:50:21Z 2021-03-03T06:50:21Z 2020 Thesis-Doctor of Philosophy Eh, A. L. S. (2020). Reversible electrochemical mirror devices. Doctoral thesis, Nanyang Technological University, Singapore. https://hdl.handle.net/10356/146626 10.32657/10356/146626 en https://doi.org/10.1039/C7TC01070B https://doi.org/10.1002/advs.201903198 This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License (CC BY-NC 4.0). application/pdf Nanyang Technological University |
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Engineering::Materials Eh, Alice Lee Sie Reversible electrochemical mirror devices |
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Reversible electrochemical mirror (REM) electrochromic devices with merits of various optical states, facile device assembly, and cost effectiveness are attractive alternatives to conventional electrochromic devices.
Current REM works are dominated by Ag metal, which is highly costly, poor cycling stability in the reflectance mode, and slower switching speed. This thesis hypothesized that by judiciously selecting the electrolyte components and understanding the electrochemistry of Cu deposition and dissolution, Cu REM can be realized. As an electrochemically active material, Cu can be electrochemically tuned to achieve different redox states with controlled electrical bias. By controlling the different redox states of Cu, various optical states can be attained in the REMs.
The current bottleneck in REM is the poor durability in the reflectance mode. The pure Cu REM functions based on Cu metal electrodeposition and dissolution, of which the reversibility may not be satisfactory without the assistance of an alloying element. With the incorporation of an alloying element, it could assist in the electrochemical deposition and dissolution of Cu and hence, promote reversibility. From the kinetics study, the electrochemical deposition of CuSn film is relatively fast. Sn serves to provide a nucleation layer during electrodeposition as validated using Johnson–Mehl–Avrami–Kolmogorov (JMAK) analysis. Furthermore, a hybridization approach, with its well-tailored electrolyte combination and optimization, has been designed for development of high-performance and safe REM electrolyte. The established electrolyte delivers superior electrochemical behavior, stability, current efficiency, and ionic conductivity of the hybrid electrolyte compared to aqueous and non-aqueous electrolytes. |
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Lee Pooi See |
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Lee Pooi See Eh, Alice Lee Sie |
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Thesis-Doctor of Philosophy |
author |
Eh, Alice Lee Sie |
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Eh, Alice Lee Sie |
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Reversible electrochemical mirror devices |
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Reversible electrochemical mirror devices |
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Reversible electrochemical mirror devices |
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Reversible electrochemical mirror devices |
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Reversible electrochemical mirror devices |
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reversible electrochemical mirror devices |
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Nanyang Technological University |
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2021 |
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https://hdl.handle.net/10356/146626 https://doi.org/10.1039/C7TC01070B https://doi.org/10.1002/advs.201903198 |
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