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Mapping (Pseudo)Capacitive Charge Storage Dynamics in Titanium Carbide MXene Electrodes in Aqueous Electrolytes Using 3D Bode Analysis
, S. Uzun, G. Valurouthu, Y. Gogotsi
Published in Elsevier B.V.
2021
Volume: 39
   
Pages: 347 - 353
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. © 2021 Elsevier B.V.
About the journal
JournalData powered by TypesetEnergy Storage Materials
PublisherData powered by TypesetElsevier B.V.
ISSN24058297