Electrochemical and in-situ X-ray diffraction studies of Ti3C2Tx MXene in ionic liquid electrolyte |
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| Affiliation: | 1. CIRIMAT, Université de Toulouse, CNRS, INPT, UPS, 118, Route de Narbonne, 31062 Toulouse cedex 9, France;2. Reseau sur le Stockage Electrochimique de l''Energie (RS2E) FR CNRS, 3459, France;3. Department of Materials Science & Engineering, A.J. Drexel Nanomaterials Institute, Drexel University, Philadelphia, PA 19104, USA;1. Université Paul Sabatier, CIRIMAT UMR CNRS 5085, 118 route de Narbonne, 31062 Toulouse, France;2. Réseau sur le Stockage Electrochimique de l''Energie (RS2E), FR CNRS 3459, France;3. Department of Materials Science and Engineering and A. J. Drexel Nanomaterials Institute, Drexel University, Philadelphia, PA 19104, USA;1. Université Paul Sabatier, Laboratoire CIRIMAT UMR CNRS, Toulouse 5085, France;2. Réseau sur le Stockage Electrochimique de l''Energie (RS2E), FR CNRS n°3459, France;3. Institut Universitaire de France, 1 rue des Ecoles, Paris 75003, France |
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| Abstract: | 2D titanium carbide (Ti3C2Tx MXene) showed good capacitance in both organic and neat ionic liquid electrolytes, but its charge storage mechanism is still not fully understood. Here, electrochemical characteristics of Ti3C2Tx electrode were studied in neat EMI-TFSI electrolyte. A capacitive behavior was observed within a large electrochemical potential range (from − 1.5 to 1.5 V vs. Ag). Intercalation and de-intercalation of EMI+ cations and/or TFSI− anions were investigated by in-situ X-ray diffraction. Interlayer spacing of Ti3C2Tx flakes decreases during positive polarization, which can be ascribed to either electrostatic attraction effect between intercalated TFSI− anions and positively charged Ti3C2Tx nanosheets or steric effect caused by de-intercalation of EMI+ cations. The expansion of interlayer spacing when polarized to negative potentials is explained by steric effect of cation intercalation. |
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