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Research Article | Open Access

Constructed TiO2/WO3 heterojunction with strengthened nano-trees structure for highly stable electrochromic energy storage device

Lili Zhaoa, Zhuoan Caia, Xiaoyang Wangb, Wenbo Liaoa, Simin Huanga,c, Lingyun Yea, Jilie Fanga, Chunxing Wua, Hao Qiua, Lei Miaob( )
School of Chemical Engineering and Energy Technology, Dongguan University of Technology, Dongguan 523808, China
Guangxi Key Laboratory of Information Materials, Engineering Research Center of Electronic Information Materials and Devices, Ministry of Education, School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China
Guangdong Provincial Key Laboratory of Distributed Energy Systems, Dongguan 523808, China
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Graphical Abstract

Abstract

Tungsten trioxide (WO3) has been widely regarded as a prospective bifunctional material due to its electrochromic and pseudocapacitive properties, while still facing the dilemma of inadequate cycle stability and trapping-induced degradation. Here, inspired by the trees-strengthening approach, a unique titanium dioxide (TiO2) nanorod arrays strengthened WO3 nano-trees (TWNTs) heterojunction was rationally designed and constructed. In sharp contrast to the transmittance modulation (ΔT) attenuation of primary WO3 nano-trees during cycling, the TWNTs film showed not only excellent electrochromic performance but also fascinating cycle stability (77.35% retention of the initial ΔT after 10,000 cycles). Besides, the trapping-induced degradation could be easily rejuvenated by a potentiostatic de-trapping process. An electrochromic energy storage device (EESD) was further assembled based on the TWNTs film to deliver excellent ΔT (up to 79.5% at 633 nm), fast switching speed (tc/tb =1.9 s/14.8 s), extremely high coloration efficiency value (443.4 cm2·C−1), and long-term cycle stability (over 10,000 charge/discharge cycles). This innovative study provided in-depth insights into the electrochromism nature and a significant step in the realization of stable electrochromic-energy storage application, paving the way for multifunctional smart windows as well as next-generation optoelectronic devices.

Keywords

electrochromic (EC)WO3 nano-treescycle stabilityTiO2 nanorod arrays (TiO2 NRAs)energy storage

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Journal of Advanced Ceramics
Volume 12 Issue 3,
March 2023
Pages 634-648
DOI: 10.26599/JAC.2023.9220711
Cite this article:
Zhao L, Cai Z, Wang X, et al. Constructed TiO2/WO3 heterojunction with strengthened nano-trees structure for highly stable electrochromic energy storage device. Journal of Advanced Ceramics, 2023, 12(3): 634-648. https://doi.org/10.26599/JAC.2023.9220711

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Received: 06 September 2022
Revised: 03 December 2022
Accepted: 23 December 2022
Published: 15 February 2023
© The Author(s) 2022.

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