Li Ran, Ma Xiaoyuan, Li Jianmin, Cao Jun, Gao Hongze, Li Tianshu, Zhang Xiaoyu, Wang Lichao, Zhang Qinghong, Wang Gang, Hou Chengyi, Li Yaogang, Palacios Tomás, Lin Yuxuan, Wang Hongzhi, Ling Xi
State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai, China.
Department of Chemistry, Boston University, Boston, MA, USA.
Nat Commun. 2021 Mar 11;12(1):1587. doi: 10.1038/s41467-021-21852-7.
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. TiCT) and their derived TMOs (e.g. 2D TiO) 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 TiO/TiCT heterostructures, with the TiCT layer as the transparent electrode, and the 2D TiO 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.
过渡金属氧化物（TMOs）是用于智能窗户和显示器等应用的有前景的电致变色（EC）材料，但要同时实现良好的柔韧性、高显色效率和快速响应仍存在挑战。MXenes（如TiCT）及其衍生的TMOs（如二维TiO）因其二维特性以及将它们组装成松散网络结构的可能性，是高性能和柔性EC器件的良好候选材料。在此，我们展示了基于自组装二维TiO/TiCT异质结构的柔性、快速且高显色效率的EC器件，其中TiCT层作为透明电极，二维TiO层作为EC层。受益于这些组装的纳米厚异质结构良好平衡的孔隙率和连通性，它们呈现出快速且高效的离子和电子传输，以及卓越的机械和电化学稳定性。我们进一步展示了大面积柔性器件，其有可能集成到弯曲和柔性表面上，用于未来的普及电子设备。
