Shao, Hui
and Xu, Kui and Wu, Yih-Chyng and Iadecola, Antonella and Liu, Liyuan and Ma, Hongyun and Qu, Liangti and Raymundo-Piñero, Encarnacion and Zhu, Jixin and Lin, Zifeng and Taberna, Pierre-Louis and Simon, Patrice
Unraveling the Charge Storage Mechanism of Ti3C2Tx MXene Electrode in Acidic Electrolyte.
(2020)
ACS Energy Letters, 5 (9). 2873-2880. ISSN 2380-8195
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(Document in English)
PDF (Author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader 3MB |
Official URL: https://doi.org/10.1021/acsenergylett.0c01290
Abstract
Two-dimensional Ti3C2Tx MXenes have been extensively studied as pseudocapacitive electrode materials. This Letter aims at providing further insights into the charge storage mechanism of the Ti3C2Tx MXene electrode in the acidic electrolyte by combining experimental and simulation approaches. Our results show that the presence of H2O molecules between the MXene layers plays a critical role in the pseudocapacitive behavior, providing a pathway for proton transport to activate the redox reaction of the Ti atoms. Also, thermal annealing of the samples at different temperatures suggests that the presence of the confined H2O molecules is mainly controlled by the surface termination groups. These findings pave the way for alternative strategies to enhance the high-rate performance of MXenes electrodes by optimizing their surface termination groups.
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