Potential Gradient‐Driven Dual‐Functional Electrochromic and Electrochemical Device Based on a Shared Electrode Design

Author:

Xu Gang1,Zhang Wei1ORCID,Zhu Guangjun12,Xia Huan1,Zhang Hanning1,Xie Qian1,Jin Peng3,Zhang Haoyu1,Yi Chengjie1,Zhang Ruqian1,Ji Lingfeng1,Shui Tao1,Moloto Nosipho4,She Wei12,Sun ZhengMing1

Affiliation:

1. Jiangsu Key Laboratory of Advanced Metallic Materials School of Materials Science and Engineering Southeast University Nanjing 211189 China

2. State Key Laboratory of High Performance Civil Engineering Materials Southeast University Nanjing 211189 China

3. Department of Civil and Mechanical Engineering Technical University of Denmark Kgs Lyngby 2800 Denmark

4. Molecular Science Institute School of Chemistry University of the Witwatersrand Private Bag 3, Wits 2050 Johannesburg 2000 South Africa

Abstract

AbstractThe integration of electrochromic devices and energy storage systems in wearable electronics is highly desirable yet challenging, because self‐powered electrochromic devices often require an open system design for continuous replenishment of the strong oxidants to enable the coloring/bleaching processes. A self‐powered electrochromic device has been developed with a close configuration by integrating a Zn/MnO2 ionic battery into the Prussian blue (PB)‐based electrochromic system. Zn and MnO2 electrodes, as dual shared electrodes, the former one can reduce the PB electrode to the Prussian white (PW) electrode and serves as the anode in the battery; the latter electrode can oxidize the PW electrode to its initial state and acts as the cathode in the battery. The bleaching/coloring processes are driven by the gradient potential between Zn/PB and PW/MnO2 electrodes. The as‐prepared Zn||PB||MnO2 system demonstrates superior electrochromic performance, including excellent optical contrast (80.6%), fast self‐bleaching/coloring speed (2.0/3.2 s for bleaching/coloring), and long‐term self‐powered electrochromic cycles. An air‐working Zn||PB||MnO2 device is also developed with a 70.3% optical contrast, fast switching speed (2.2/4.8 s for bleaching/coloring), and over 80 self‐bleaching/coloring cycles. Furthermore, the closed nature enables the fabrication of various flexible electrochromic devices, exhibiting great potentials for the next‐generation wearable electrochromic devices.

Funder

National Key Research and Development Program of China

Fundamental Research Funds for the Central Universities

Aeronautical Science Foundation of China

Natural Science Foundation of Jiangsu Province

National Natural Science Foundation of China

Publisher

Wiley

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