期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 125, 期 31, 页码 17232-17240出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.1c05178
关键词
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资金
- National Key Research and Development Program of China [2018YFB2200403, 2018YFA0704404]
- National Natural Science Foundation of China [61775003, 11734001, 91950204, 11527901, 91850111]
- Beijing Municipal Science & Technology Commission [Z191100007219001]
MXene, a highly conductive 2D material with high cation capacity, is considered a promising choice for next-generation electrodes in energy-storage batteries. In practical applications, the electron transfer process across different layers in multilayered MXene flakes should be carefully investigated to improve performance. Temperature, cation intercalation, and flake morphology were found to influence the interlayer electron-transfer process sensitivity. Additionally, ultrafast time-resolved measurements showed suppression of the thermal-active regime for interlayer electron transfer in intercalated MXene flakes.
MXene, an emerging highly conductive two-dimensional (2D) material with high cation capacity, has been widely accepted as a promising choice for next-generation electrodes in energy-storage batteries. To further improve performance, more attention should be paid to the electron-transfer process across different layers when using multilayered MXene flakes as electrodes in practical applications. In this work, threshold photoemission electron microscopy is used to characterize the transfer process of photoexcited electrons from buried layers to the top surface, with selective focus on the electron states near the Fermi level. We find that the interlayer electron-transfer process is highly sensitive to the spacing distance between neighboring layers, which varies upon temperature, cation intercalation, and flake morphology. Furthermore, ultrafast time-resolved measurements indicate that the thermal-active regime is suppressed for the interlayer electron-transfer process in intercalated MXene flakes. Our findings would serve as guidelines for the intercalation engineering of Mo-based MXene flakes, which is of critical importance in the development of applications in electrodes, capacitance, and batteries.
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