Intercalation‐Induced Reversible Electrochromic Behavior of Two‐Dimensional Ti3C2Tx MXene in Organic Electrolytes
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Dec 02, 2020
- Source ID
- 10.1002/celc.202001449
Entities
People
- Christopher E Shuck
- Hongzhi Wang
- Jianmin Li
- Kanit Hantanasirisakul
- Kathleen Maleski
- Ke Li
- Patrick Urbankowski
- Paul Kent
- Weiwei Sun
- Xiaofeng Wang
- Xuehang Wang
- Yury Gogotsi
Organizations
- Army Research Office
- Donghua University
- Drexel University
- National Natural Science Foundation of China
- Oak Ridge National Laboratory
- Office of Basic Energy Sciences
- Office of Science
- Southeast University
- United States Department of Energy