Abstract
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.
| Original language | English |
|---|---|
| Pages (from-to) | 151-156 |
| Number of pages | 6 |
| Journal | ChemElectroChem |
| Volume | 8 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 4 2021 |
Funding
This research was supported by the Fluid Interface Reactions, Structures, and Transport (FIRST) Center, an Energy Frontier Research Center (EFRC) funded by the US Department of Energy, Office of Science, and Office of Basic Energy Sciences. J.L. thanks the support through the Special Excellent PhD International Visit Program by Donghua University. W.S. acknowledges the National Natural Science Foundation of China (Grant No. 51902052). K.M. thanks the support from the Army Research Office under Cooperative Agreement Number W911NF-18-2-0026 via the Surface Science Initiative Program (PE 0601102 A Project VR9) at the Edgewood Chemical Biological Center. XRD, SEM, and XPS analyses were performed at the Materials Characterization Core (MCC) at Drexel University. This research used resources of the National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility operated under Contract No. DE-AC02-05CH11231. This research was supported by the Fluid Interface Reactions, Structures, and Transport (FIRST) Center, an Energy Frontier Research Center (EFRC) funded by the US Department of Energy, Office of Science, and Office of Basic Energy Sciences. J.L. thanks the support through the Special Excellent PhD International Visit Program by Donghua University. W.S. acknowledges the National Natural Science Foundation of China (Grant No. 51902052). K.M. thanks the support from the Army Research Office under Cooperative Agreement Number W911NF‐18‐2‐0026 via the Surface Science Initiative Program (PE 0601102 A Project VR9) at the Edgewood Chemical Biological Center. XRD, SEM, and XPS analyses were performed at the Materials Characterization Core (MCC) at Drexel University. This research used resources of the National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science User Facility operated under Contract No. DE‐AC02‐05CH11231.
| Funders | Funder number |
|---|---|
| Energy Frontier Research Center | |
| U.S. Department of Energy | DE‐AC02‐05CH11231 |
| Army Research Office | PE 0601102, W911NF‐18‐2‐0026 |
| Office of Science | |
| Basic Energy Sciences | |
| Drexel University | |
| Edgewood Chemical Biological Center | |
| National Natural Science Foundation of China | 51902052 |
| Donghua University |
Keywords
- Electrochromic
- MXene
- Organic electrolyte
- Photoelectronic
- Transparent device