Print Email Facebook Twitter Enhancing pseudocapacitive intercalation in Ti3C2T x MXene with molecular crowding electrolytes Title Enhancing pseudocapacitive intercalation in Ti3C2T x MXene with molecular crowding electrolytes Author Chen, C. (TU Delft RST/Storage of Electrochemical Energy) de Kogel, Albert (Student TU Delft) Weijers, M.J. (TU Delft ChemE/Materials for Energy Conversion and Storage) Bannenberg, L.J. (TU Delft RID/TS/Instrumenten groep) Wang, Xuehang (TU Delft RST/Storage of Electrochemical Energy) Date 2024 Abstract The growing demand for safe, cost-efficient, high-energy and high-power electrochemical energy storage devices has stimulated the development of aqueous-based supercapacitors with high capacitance, high rate capability, and high voltage. 2D titanium carbide MXene-based electrodes have shown excellent rate capability in various dilute aqueous electrolytes, yet their potential window is usually narrower than 1.2 V. In this study, we show that the potential window of Ti3C2T x MXene can be efficiently widened to 1.5 V in a cost-effective and environmentally benign polyethylene glycol (PEG) containing molecular crowding electrolyte. Additionally, a pair of redox peaks at −0.25 V/−0.05 V vs. Ag (cathodic/anodic) emerged in cyclic voltammetry after the addition of PEG, yielding an additional 25% capacitance. Interestingly, we observed the co-insertion of the molecular crowding agent PEG-400 during the Li+ intercalation process based on in-situ x-ray diffraction analysis. As a result, Ti3C2T x electrodes presented an interlayer space change of 4.7 Å during a complete charge/discharge cycle, which is the largest reversible interlayer space change reported so far for MXene-based electrodes. This work demonstrates the potential of adding molecular crowding agents to improve the performance of MXene electrodes in aqueous electrolytes and to enlarge the change of the interlayer spacing. Subject electrochemical energy storageintercalationinterlayer spacingmolecular crowding electrolyteMXenepolyethylene glycolsupercapacitor To reference this document use: http://resolver.tudelft.nl/uuid:dd6a5c46-601d-4625-8b90-55ee9ee12330 DOI https://doi.org/10.1088/2053-1583/acff08 ISSN 2053-1583 Source 2D Materials, 11 (1) Part of collection Institutional Repository Document type journal article Rights © 2024 C. Chen, Albert de Kogel, M.J. Weijers, L.J. Bannenberg, Xuehang Wang Files PDF Chen_2024_2D_Mater._11_015001.pdf 2.27 MB Close viewer /islandora/object/uuid:dd6a5c46-601d-4625-8b90-55ee9ee12330/datastream/OBJ/view