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Tunable electrochromic behavior of titanium-based MXenes.
Nanoscale ( IF 5.8 ) Pub Date : 2020-06-10 , DOI: 10.1039/d0nr02673e
Geetha Valurouthu 1 , Kathleen Maleski 1 , Narendra Kurra 1 , Meikang Han 1 , Kanit Hantanasirisakul 1 , Asia Sarycheva 1 , Yury Gogotsi 1
Affiliation  

Two-dimensional transition metal carbides, nitrides and carbonitrides, popular by the name MXenes, are a promising class of materials as they exhibit intriguing optical, optoelectronic and electrochemical properties. Taking advantage of their metallic conductivity and hydrophilicity, titanium carbide MXenes (Ti3C2Tx and others) are used to fabricate solution processable transparent conducting electrodes (TCEs) for the design of three-electrode electrochromic cells. However, the tunable electrochromic behavior of various titanium-based MXene compositions across the entire visible spectrum has not yet been demonstrated. Here, we investigate the intrinsic electrochromic properties of titanium-based MXenes, Ti3C2Tx, Ti3CNTx, Ti2CTx, and Ti1.6Nb0.4CTx, where individual MXenes serve as a transparent conducting, electrochromic, and plasmonic material layer. Plasmonic extinction bands for Ti3C2Tx, Ti2CTx and Ti1.6Nb0.4CTx are centered at 800, 550 and 480 nm, which are electrochemically tunable to 630, 470 and 410 nm, respectively, whereas Ti3CNTx shows a reversible change in transmittance in the wide visible range. Additionally, the switching rates of MXene electrodes with no additional transparent conductor electrodes are estimated and correlated with the respective electrical figure of merit values. This study demonstrates that MXene-based electrochromic cells are tunable in the entire visible spectrum and suggests the potential of the MXene family of materials in optoelectronic, plasmonic, and photonic applications, such as tunable visible optical filters and modulators, to name a few.

中文翻译:

钛基MXene的可调电致变色行为。

二维过渡金属碳化物,氮化物和碳氮化物,以MXenes的名字流行,是一类有前途的材料,因为它们表现出令人着迷的光学,光电和电化学性能。利用其金属导电性和亲水性,碳化钛MXene(Ti 3 C 2 T x等)用于制造可溶液加工的透明导电电极(TCE),用于设计三电极电致变色电池。然而,尚未证明各种钛基MXene组合物在整个可见光谱范围内的可调电致变色行为。在这里,我们研究钛基MXenes Ti 3 C 2的固有电致变色性能T x,Ti 3 CNT x,Ti 2 CT x和Ti 1.6 Nb 0.4 CT x,其中各个MXene用作透明的导电,电致变色和等离激元材料层。Ti 3 C 2 T x,Ti 2 CT x和Ti 1.6 Nb 0.4 CT x的等离子消光带的中心位于800、550和480 nm,可通过电化学方式分别调谐至630、470和410 nm,而Ti 3 CNT X在宽可见范围内显示出透射率的可逆变化。另外,估计没有附加透明导体电极的MXene电极的开关速率,并将其与相应的品质因数电值相关。这项研究表明,基于MXene的电致变色电池在整个可见光谱范围内都是可调的,并暗示了MXene系列材料在光电,等离子和光子应用中的潜力,例如可调式可见光滤光片和调制器等。
更新日期:2020-07-09
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