RT Journal Article A1 Jianxia Jiang,Leiqiang Qin,Joseph Halim,Per O. Å. Persson,Lintao Hou,Johanna Rosen; AD 广州市真空薄膜技术与新能源材料重点实验室, 中国 ; 物理、化学和生物学系, 瑞典 ; 物理、化学和生物学系, 瑞典 ; 物理、化学和生物学系, 瑞典 ; 物理、化学和生物学系, 瑞典 ; 广州市真空薄膜技术与新能源材料重点实验室, 中国 ; 物理、化学和生物学系, 瑞典 T1 Colorless-to-colorful switching of electrochromic MXene by reversible ion insertion YR 2022 IS 4 vo 15 OP 3587-OP 3593 K1 MXenes;electrochromic materials;colorless-to-black switching;high contrast ratio;reversible Li+ insertion AB Electrochromic (EC) materials that change color with voltage have been widely studied for use in dynamic windows. However, colorless-to-colorful switching with high contrast ratio is generically unattainable, especially for colorless-to-black electrochromic materials with an ultrahigh contrast ratio over the entire visible region. In this work, we developed Nb1.33C MXene-based dynamic windows with colorless-to-black switching of up to 75% reversible change in transmittance from 300 to 1,500 nm. By exploring the electrochromic effects of different electrolytes through in situ optical changes and electrochemical quartz crystal microbalance (EQCM), it is found that electrochromic behavior is greatly influenced by the extent of reversible Li+ insertion/deinsertion between the two-dimensional Nb1.33C MXene nanosheets. In addition, a colorless-to-black EC device based on Nb1.33C with an overall integrated contrast ratio over 80% was successfully constructed by a solution-processable spin coating method. This work enables a simple route to fabricate MXene-based high-performance electrochromic smart windows, which is important for further expanding the application of MXenes to optoelectronic and photonic applications. SN 1998-0124 LA EN