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Long-Term Stable Complementary Electrochromic Device Based on WO3 Working Electrode and NiO-Pt Counter Electrode.
Yajie Ke1, Zitao Wang1, Haiyi Xie1
1Hefei National Research Center for Physical Sciences at the Microscale, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China.
Membranes
|June 27, 2023
Summary
This study introduces a novel NiO-Pt counter electrode for complementary electrochromic devices (ECDs), significantly improving cycling stability and overcoming charge mismatch issues for practical smart window applications.
Area of Science:
- Materials Science
- Electrochemistry
- Nanotechnology
Background:
- Complementary electrochromic devices (ECDs) using WO3 and NiO electrodes are vital for smart windows.
- Poor cycling stability due to ion-trapping and charge mismatch hinders practical ECD applications.
Purpose of the Study:
- To enhance the stability and overcome charge mismatch in complementary electrochromic devices.
- To introduce a partially covered NiO-Pt counter electrode (CE) within an electrochromic electrode/Redox/catalytic counter electrode (ECM/Redox/CCE) structure.
Main Methods:
- Assembled an ECD with a WO3 working electrode and a NiO-Pt CE.
- Utilized a PC/LiClO4 electrolyte containing a tetramethylthiourea/tetramethylformaminium disulfide (TMTU/TMFDS2+) redox couple.
- Investigated the electrochemical performance and cycling stability of the fabricated device.
Main Results:
- Achieved excellent electrochromic performance: 68.2% optical modulation, rapid switching (5.3s coloring, 12.8s bleaching), and high coloration efficiency (89.6 cm2·C-1).
- Demonstrated remarkable cycling stability over 10,000 cycles.
- The NiO-Pt CE and ECM/Redox/CCE structure effectively addressed charge mismatch and enhanced stability.
Conclusions:
- The proposed ECM/Redox/CCE structure successfully overcomes charge mismatch in complementary electrochromic devices.
- Platinum incorporation enhances the redox couple's electrochemical activity, leading to improved device stability.
- This research offers a promising strategy for developing durable and practical complementary electrochromic devices.
