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Unraveling the Charge Storage Mechanism of Ti3C2Tx MXene Electrode in Acidic Electrolyte

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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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.

Item Type:Article
HAL Id:hal-03065967
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Collège de France (FRANCE)
Other partners > Ecole Nationale Supérieure de Chimie de Paris - ENSCP (FRANCE)
Other partners > Ecole Nationale Supérieure de Chimie de Montpellier - ENSCM (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > Institut polytechnique de Grenoble (FRANCE)
Other partners > Université Paris Sciences & Lettres - PSL (FRANCE)
Other partners > Sichuan University - SCU (CHINA)
Other partners > Sorbonne Université (FRANCE)
Other partners > Université Grenoble Alpes - UGA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Université de Nantes (FRANCE)
Other partners > Université de Picardie Jules Verne (FRANCE)
Other partners > Nanjing Tech University (CHINA)
Other partners > Tsinghua University (CHINA)
Other partners > Université de Pau et des Pays de l'Adour - UPPA (FRANCE)
Other partners > Université de Haute Alsace - UHA (FRANCE)
Laboratory name:
Funders:
Agence Nationale de la Recherche - ANR (FRANCE) - Sichuan Science and Technology Program (CHINA)
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Deposited On:01 Feb 2021 11:46

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