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Ultra-high-rate pseudocapacitive energy storage in two-dimensional transition metal carbides

Lukatskaya, Maria R. and Kota, Sankalp and Lin, Zifeng and Zhao, Meng-Qiang and Shpigel, Netanel and Levi, Mikhael D. and Halim, Joseph and Taberna, Pierre-Louis and Barsoum, Michel W. and Simon, Patrice and Gogotsi, Yury Ultra-high-rate pseudocapacitive energy storage in two-dimensional transition metal carbides. (2017) Nature Energy, 2 (8). 1-12. ISSN 2058-7546

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Official URL: https://doi.org/10.1038/nenergy.2017.105


The use of fast surface redox storage (pseudocapacitive) mechanisms can enable devices that store much more energy than electrical double-layer capacitors (EDLCs) and, unlike batteries, can do so quite rapidly. Yet, few pseudocapacitive transition metal oxides can provide a high power capability due to their low intrinsic electronic and ionic conductivity. Here we demonstrate that two-dimensional transition metal carbides (MXenes) can operate at rates exceeding those of conventional EDLCs, but still provide higher volumetric and areal capacitance than carbon, electrically conducting polymers or transition metal oxides.We applied two distinct designs for MXene electrode architectures with improved ion accessibility to redox-active sites. A macroporous Ti3C2Tx MXene film delivered up to 210 F g-1 at scan rates of 10Vs-1, surpassing the best carbon supercapacitors known. In contrast, we show that MXene hydrogels are able to deliver volumetric capacitance of 1,500 F cm-3 reaching the previously unmatched volumetric performance of RuO2.

Item Type:Article
HAL Id:hal-02007475
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Drexel University (USA)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Stanford University (USA)
Laboratory name:
Deposited On:05 Feb 2019 10:41

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