Journal article
Mapping (Pseudo)Capacitive Charge Storage Dynamics in Titanium Carbide MXene Electrodes in Aqueous Electrolytes Using 3D Bode Analysis
Energy Storage Materials, v 39, pp 347-353
Aug 2021
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Pseudocapacitive materials offer high charge storage capacities at high rates with charging time scales of tens of seconds to a few minutes. Voltammetry methods are extensively employed in understanding complex charge storage processes in pseudocapacitive materials. In this study, three-dimensional (3D) Bode analysis is employed in investigating charge storage dynamics of two-dimensional (2D) titanium carbides, Ti3C2Tx and Ti2CTx MXenes. Ti3C2Tx is used as a model system due to its high metallic conductivity and electrolyte-dependent capacitive/redox charge storage properties to better understand the charge storage dynamics in acidic and neutral electrolytes. In electrochemical impedance measurements, Ti3C2Tx/acidic electrolyte interface shows a high real capacitance accompanied by a low phase angle at specific potentials in the capacitive domain of frequencies (10 mHz to 1 Hz), demonstrating pseudocapacitive behavior. On the other hand, Ti3C2Tx/neutral electrolyte interface exhibits invariant low real capacitance with high phase angle values in the low frequency regime, indicating a double-layer charge storage mechanism. The charge storage dynamics of MXene electrodes determined using 3D Bode analysis corroborates well with the kinetic analyses using voltammetry methods.
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Details
- Title
- Mapping (Pseudo)Capacitive Charge Storage Dynamics in Titanium Carbide MXene Electrodes in Aqueous Electrolytes Using 3D Bode Analysis
- Creators
- Narendra Kurra - A. J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USASimge Uzun - A. J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USAGeetha Valurouthu - A. J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USAYury Gogotsi - A. J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering, Drexel University, Philadelphia, PA 19104, USA
- Publication Details
- Energy Storage Materials, v 39, pp 347-353
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering
- Web of Science ID
- WOS:000655750300001
- Scopus ID
- 2-s2.0-85105499047
- Other Identifier
- 991015238289604721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology