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Tunable electrochromic behavior of titanium-based MXenes (Electronic supplementary information (ESI) available. See DOI: 10.1039/d0nr02673e)
Journal article   Open access

Tunable electrochromic behavior of titanium-based MXenes (Electronic supplementary information (ESI) available. See DOI: 10.1039/d0nr02673e)

Geetha Valurouthu, Kathleen Maleski, Narendra Kurra, Meikang Han, Kanit Hantanasirisakul, Asia Sarycheva and Yury Gogotsi
Nanoscale, v 12(26), pp 14204-14212
01 Jan 2020
DOI: https://doi.org/10.1039/d0nr02673e
Featured in Collection :   UN Sustainable Development Goals @ Drexel
url
https://www.osti.gov/biblio/1803426View
SubmittedOpen Access (License Unspecified),  Open

Abstract

Optical filters Conduction Electrochemical analysis Optoelectronics Transition metals Electrochromic cells Conductors Electrochromism Modulators Titanium carbide Carbon nitride Electrodes Electrical resistivity Metal carbides Optical properties Titanium Fluid filters Visible spectrum Plasmonics Figure of merit
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.

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Web of Science research areas
Chemistry, Multidisciplinary
Materials Science, Multidisciplinary
Nanoscience & Nanotechnology
Physics, Applied
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