Journal
CHEMELECTROCHEM
Volume 8, Issue 1, Pages 151-156Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/celc.202001449
Keywords
MXene; Electrochromic; Photoelectronic; Organic electrolyte; Transparent device
Categories
Funding
- Fluid Interface Reactions, Structures, and Transport (FIRST) Center, an Energy Frontier Research Center (EFRC) - US Department of Energy, Office of Science
- Fluid Interface Reactions, Structures, and Transport (FIRST) Center, an Energy Frontier Research Center (EFRC) - US Department of Energy, Office of Basic Energy Sciences
- Special Excellent PhD International Visit Program by Donghua University
- National Natural Science Foundation of China [51902052]
- Army Research Office via the Surface Science Initiative Program at the Edgewood Chemical Biological Center [W911NF-18-2-0026, PE 0601102 A]
- National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility [DE-AC02-05CH11231]
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MXenes are a large family of two-dimensional materials with unique physical and chemical properties, allowing for reversible ion intercalation and modification of various properties, including reversible electrochromic behavior in aqueous electrolytes. The electrochromic effect in Ti3C2Tx is primarily due to the formation of stable O-Li bonds and changes induced by inter-band excitations.
MXenes, a large family of two-dimensional materials, have attracted tremendous attention due to their unique physical and chemical properties. Reversible ion intercalation between MXene layers allows modification of the optical, thermal, magnetic, and chemical properties. The electrochemical charge/discharge of MXenes in aqueous electrolytes was reported to lead to reversible electrochromic behavior. In this work, the electrochromic effect of semitransparent Ti3C2Tx MXene film was probed by electrochemical intercalation of Li ions. Correspondingly, a peak shift of 100 nm was observed in the UV-vis spectrum. By combining in-situ Raman spectroscopy, in-situ X-ray diffraction, and density functional theory calculations, we show that the electrochromic shift is primarily due to the formation of robust O-Li bonds and the emerging bands induced changes of inter-band excitations. Understanding the mechanism of electrochromic behavior in Ti3C2Tx lays the foundations of designating 2D materials with durable, controllable, and efficient intercalation-induced electrochromic behaviors.
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