Transparent,Flexible, and Conductive 2D Titanium Carbide (MXene) Films with High Volumetric Capacitance |
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| Authors: | Chuanfang Zhang Babak Anasori Andrés Seral‐Ascaso Sang‐Hoon Park Niall McEvoy Aleksey Shmeliov Georg S. Duesberg Jonathan N. Coleman Yury Gogotsi Valeria Nicolosi |
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| Affiliation: | 1. Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN) and Advanced Materials Bio‐Engineering Research Centre (AMBER), Trinity College Dublin, Dublin 2, Ireland;2. School of Chemistry, Trinity College Dublin, Dublin 2, Ireland;3. Department of Materials Science and Engineering, A. J. Drexel Nanomaterials Institute, Drexel University, Philadelphia, PA, USA;4. School of Physics, Trinity College Dublin, Dublin 2, Ireland;5. Institute of Physics, EIT 2, Faculty of Electrical Engineering and Information Technology, Universit?t der Bundeswehr, Neubiberg, München, Germany |
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| Abstract: | 2D transition‐metal carbides and nitrides, known as MXenes, have displayed promising properties in numerous applications, such as energy storage, electromagnetic interference shielding, and catalysis. Titanium carbide MXene (Ti3C2Tx ), in particular, has shown significant energy‐storage capability. However, previously, only micrometer‐thick, nontransparent films were studied. Here, highly transparent and conductive Ti3C2Tx films and their application as transparent, solid‐state supercapacitors are reported. Transparent films are fabricated via spin‐casting of Ti3C2Tx nanosheet colloidal solutions, followed by vacuum annealing at 200 °C. Films with transmittance of 93% (≈4 nm) and 29% (≈88 nm) demonstrate DC conductivity of ≈5736 and ≈9880 S cm?1, respectively. Such highly transparent, conductive Ti3C2Tx films display impressive volumetric capacitance (676 F cm?3) combined with fast response. Transparent solid‐state, asymmetric supercapacitors (72% transmittance) based on Ti3C2Tx and single‐walled carbon nanotube (SWCNT) films are also fabricated. These electrodes exhibit high capacitance (1.6 mF cm?2) and energy density (0.05 µW h cm?2), and long lifetime (no capacitance decay over 20 000 cycles), exceeding that of graphene or SWCNT‐based transparent supercapacitor devices. Collectively, the Ti3C2Tx films are among the state‐of‐the‐art for future transparent, conductive, capacitive electrodes, and translate into technologically viable devices for next‐generation wearable, portable electronics. |
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| Keywords: | MXene percolation solid‐state supercapacitors transparent conductive electrodes volumetric capacitance |
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