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Molecules
2023 Mar 14;286:. doi: 10.3390/molecules28062634.
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Sea-Cucumber-like Microstructure Polyoxometalate/TiO2 Nanocomposite Electrode for High-Performance Electrochromic Energy Storage Devices.
Qu X
,
Zhou L
,
Liu Z
,
Wang Z
,
Wang J
,
Yu X
,
Jin H
,
Yang Y
.
Abstract
The key challenge in the practical application of electrochromic energy storage devices (EESDs) is the fabrication of high-performance electrode materials. Herein, we deposited K7[La(H2O)x(α2-P2W17O61)] (P2W17La) onto TiO2 nanowires (NW) to construct an NW-P2W17La nanocomposite using a layer-by-layer self-assembly method. In contrast to the pure P2W17La films, the nanocomposite exhibits enhanced electrochromic and electrochemical performance owing to the 3D sea-cucumber-like microstructure. An EESD using the NW-P2W17La film as the cathode exhibited outstanding electrochromic and energy storage properties, with high optical modulation (48.6% at 605 nm), high switching speeds (tcoloring = 15 s, tbleaching = 4 s), and high area capacitance (5.72 mF cm-2 at 0.15 mA cm-2). The device can reversibly switch between transparent and dark blue during the charge/discharge process, indicating that electrochromic contrast can be used as a quantitative indicator of the energy storage status.
YDZJ202101ZYTS175 Natural Science Foundation of Jilin Province, 22071080 National Natural Science Foundation of China, JJKH20210236KJ；JJKH20220234KJ Scientific Research Fund of Education Department of Jilin Province
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