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Intercalation‐Induced Reversible Electrochromic Behavior of Two‐Dimensional Ti3C2Tx MXene in Organic Electrolytes
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-11-23 , DOI: 10.1002/celc.202001449 Jianmin Li 1, 2 , Xuehang Wang 1 , Weiwei Sun 3, 4 , Kathleen Maleski 1 , Christopher E. Shuck 1 , Ke Li 1 , Patrick Urbankowski 1 , Kanit Hantanasirisakul 1 , Xiaofeng Wang 1 , Paul Kent 3, 5 , Hongzhi Wang 2 , Yury Gogotsi 1
ChemElectroChem ( IF 3.5 ) Pub Date : 2020-11-23 , DOI: 10.1002/celc.202001449 Jianmin Li 1, 2 , Xuehang Wang 1 , Weiwei Sun 3, 4 , Kathleen Maleski 1 , Christopher E. Shuck 1 , Ke Li 1 , Patrick Urbankowski 1 , Kanit Hantanasirisakul 1 , Xiaofeng Wang 1 , Paul Kent 3, 5 , Hongzhi Wang 2 , Yury Gogotsi 1
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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.
中文翻译：
二维Ti3C2Tx MXene在有机电解质中的嵌入诱导可逆电致变色行为
MXenes是一个大型的二维材料家族，由于其独特的物理和化学特性而引起了极大的关注。MXene层之间的可逆离子嵌入可修改光学，热，磁和化学性质。据报道，MXenes在水性电解质中的电化学充电/放电导致可逆的电致变色行为。在这项工作中，通过锂离子的电化学插入来探测半透明的Ti 3 C 2 T x MXene膜的电致变色效应。相应地，在紫外可见光谱中观察到了100 nm的峰位移。通过结合原位拉曼光谱，原位通过X射线衍射和密度泛函理论计算，我们发现电致变色位移主要归因于坚固的O-Li键的形成以及新出现的带引起的带间激发变化。了解Ti 3 C 2 T x中电致变色行为的机理为指定具有持久，可控和有效的插层诱导电致变色行为的2D材料奠定了基础。
更新日期：2021-01-04
中文翻译：
二维Ti3C2Tx MXene在有机电解质中的嵌入诱导可逆电致变色行为
MXenes是一个大型的二维材料家族，由于其独特的物理和化学特性而引起了极大的关注。MXene层之间的可逆离子嵌入可修改光学，热，磁和化学性质。据报道，MXenes在水性电解质中的电化学充电/放电导致可逆的电致变色行为。在这项工作中，通过锂离子的电化学插入来探测半透明的Ti 3 C 2 T x MXene膜的电致变色效应。相应地，在紫外可见光谱中观察到了100 nm的峰位移。通过结合原位拉曼光谱，原位通过X射线衍射和密度泛函理论计算，我们发现电致变色位移主要归因于坚固的O-Li键的形成以及新出现的带引起的带间激发变化。了解Ti 3 C 2 T x中电致变色行为的机理为指定具有持久，可控和有效的插层诱导电致变色行为的2D材料奠定了基础。
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