1. Polyoxometalate-MnO2 film structure with bifunctional electrochromic and energy storage properties
- Author
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Shi-Ming Wang, Yuan-Hang Jin, Tao Wang, Kai-Hua Wang, and Lin Liu
- Subjects
Electrochromic energy storage device ,Polyoxometalates ,Electrochromism ,Capacitor ,Materials of engineering and construction. Mechanics of materials ,TA401-492 - Abstract
The polyoxometalates-based electrochromic energy storage devices (POMs-EESDs) were constructed using P2W17O6111− coated TiO2 as the working electrode and MnO2 film as the counter electrode. The MnO2 films with different thicknesses acted as the charge balancing layer. The device showed bifunctional of enhanced EC and energy storage properties along with high durability and cycle stabilities after the introduction of MnO2 film. The optimistic thickness of MnO2 was found to be 345 nm through balancing the optical modulation and the energy storage properties. For the EC aspect, the optical contrast was enhanced by four times under the potential step of −2.0/1.0 V. The MnO2 film also introduces high capacitance leading to the device can be used as a transparent capacitor. It is the first time to construct high-performance POMs-based EESD only by introducing a simple charge balancing (MnO2) layer in the device. Moreover, the mechanism of the MnO2 layer towards the performance improvement of the POMs-based EESDs was also explained.
- Published
- 2023
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