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Sea-Cucumber-like Microstructure Polyoxometalate/TiO2 Nanocomposite Electrode for High-Performance Electrochromic Energy Storage Devices.

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.

SUBMITTER: Qu X 

PROVIDER: S-EPMC10058481 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature

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Sea-Cucumber-like Microstructure Polyoxometalate/TiO<sub>2</sub> Nanocomposite Electrode for High-Performance Electrochromic Energy Storage Devices.

Qu Xiaoshu X   Zhou Lili L   Liu Zefeng Z   Wang Zeyu Z   Wang Jilong J   Yu Xiaoyang X   Jin Hua H   Yang Yanyan Y  

Molecules (Basel, Switzerland) 20230314 6

The key challenge in the practical application of electrochromic energy storage devices (EESDs) is the fabrication of high-performance electrode materials. Herein, we deposited K<sub>7</sub>[La(H<sub>2</sub>O)<sub>x</sub>(α<sub>2</sub>-P<sub>2</sub>W<sub>17</sub>O<sub>61</sub>)] (P<sub>2</sub>W<sub>17</sub>La) onto TiO<sub>2</sub> nanowires (NW) to construct an NW-P<sub>2</sub>W<sub>17</sub>La nanocomposite using a layer-by-layer self-assembly method. In contrast to the pure P<sub>2</sub>W<sub>1  ...[more]

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