Flexible and high-performance electrochromic devices enabled by self-assembled 2D TiO2/MXene heterostructures

Ran Li, Xiaoyuan Ma, Jianmin Li, Jun Cao, Hongze Gao, Tianshu Li, Xiaoyu Zhang, Lichao Wang, Qinghong Zhang, Gang Wang, Chengyi Hou, Yaogang Li, Tomás Palacios, Yuxuan Lin (), Hongzhi Wang () and Xi Ling ()
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Ran Li: Donghua University
Xiaoyuan Ma: Boston University
Jianmin Li: Donghua University
Jun Cao: Boston University
Hongze Gao: Boston University
Tianshu Li: Boston University
Xiaoyu Zhang: Donghua University
Lichao Wang: Donghua University
Qinghong Zhang: Donghua University
Gang Wang: Donghua University
Chengyi Hou: Donghua University
Yaogang Li: Donghua University
Tomás Palacios: Massachusetts Institute of Technology
Yuxuan Lin: Massachusetts Institute of Technology
Hongzhi Wang: Donghua University
Xi Ling: Boston University

Nature Communications, 2021, vol. 12, issue 1, 1-11

Abstract: Abstract Transition metal oxides (TMOs) are promising electrochromic (EC) materials for applications such as smart windows and displays, yet the challenge still exists to achieve good flexibility, high coloration efficiency and fast response simultaneously. MXenes (e.g. Ti3C2Tx) and their derived TMOs (e.g. 2D TiO2) are good candidates for high-performance and flexible EC devices because of their 2D nature and the possibility of assembling them into loosely networked structures. Here we demonstrate flexible, fast, and high-coloration-efficiency EC devices based on self-assembled 2D TiO2/Ti3C2Tx heterostructures, with the Ti3C2Tx layer as the transparent electrode, and the 2D TiO2 layer as the EC layer. Benefiting from the well-balanced porosity and connectivity of these assembled nanometer-thick heterostructures, they present fast and efficient ion and electron transport, as well as superior mechanical and electrochemical stability. We further demonstrate large-area flexible devices which could potentially be integrated onto curved and flexible surfaces for future ubiquitous electronics.

Date: 2021
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DOI: 10.1038/s41467-021-21852-7

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