Pseudocapacitance of MXene nanosheets for high-power sodium-ion hybrid capacitors

Xianfen Wang; Satoshi Kajiyama; Hiroki Iinuma; Eiji Hosono; Shinji Oro; Isamu Moriguchi; Masashi Okubo; Atsuo Yamada

doi:10.1038/ncomms7544

Pseudocapacitance of MXene nanosheets for high-power sodium-ion hybrid capacitors

Xianfen Wang, Satoshi Kajiyama, Hiroki Iinuma, Eiji Hosono, Shinji Oro, Isamu Moriguchi, Masashi Okubo, Atsuo Yamada^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

819 Citations (Scopus)

Abstract

High-power Na-ion batteries have tremendous potential in various large-scale applications. However, conventional charge storage through ion intercalation or double-layer formation cannot satisfy the requirements of such applications owing to the slow kinetics of ion intercalation and the small capacitance of the double layer. The present work demonstrates that the pseudocapacitance of the nanosheet compound MXene Ti₂C achieves a higher specific capacity relative to double-layer capacitor electrodes and a higher rate capability relative to ion intercalation electrodes. By utilizing the pseudocapacitance as a negative electrode, the prototype Na-ion full cell consisting of an alluaudite Na₂Fe₂(SO₄)₃ positive electrode and an MXene Ti₂C negative electrode operates at a relatively high voltage of 2.4V and delivers 90 and 40mAhg^-1 at 1.0 and 5.0Ag ^-1 (based on the weight of the negative electrode), respectively, which are not attainable by conventional electrochemical energy storage systems.

Original language	English
Article number	6544
Journal	Nature communications
Volume	6
DOIs	https://doi.org/10.1038/ncomms7544
Publication status	Published - 2015 Apr 2
Externally published	Yes

ASJC Scopus subject areas

Chemistry(all)
Biochemistry, Genetics and Molecular Biology(all)
Physics and Astronomy(all)

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title = "Pseudocapacitance of MXene nanosheets for high-power sodium-ion hybrid capacitors",

abstract = "High-power Na-ion batteries have tremendous potential in various large-scale applications. However, conventional charge storage through ion intercalation or double-layer formation cannot satisfy the requirements of such applications owing to the slow kinetics of ion intercalation and the small capacitance of the double layer. The present work demonstrates that the pseudocapacitance of the nanosheet compound MXene Ti2C achieves a higher specific capacity relative to double-layer capacitor electrodes and a higher rate capability relative to ion intercalation electrodes. By utilizing the pseudocapacitance as a negative electrode, the prototype Na-ion full cell consisting of an alluaudite Na2Fe2(SO4)3 positive electrode and an MXene Ti2C negative electrode operates at a relatively high voltage of 2.4V and delivers 90 and 40mAhg-1 at 1.0 and 5.0Ag -1 (based on the weight of the negative electrode), respectively, which are not attainable by conventional electrochemical energy storage systems.",

author = "Xianfen Wang and Satoshi Kajiyama and Hiroki Iinuma and Eiji Hosono and Shinji Oro and Isamu Moriguchi and Masashi Okubo and Atsuo Yamada",

note = "Funding Information: This work was financially supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan under the {\textquoteleft}Elemental Strategy Initiative for Catalysts and Batteries{\textquoteright} (ESICB). M.O. was financially supported by the Murata Science Foundation. Publisher Copyright: {\textcopyright} 2015 Macmillan Publishers Limited. All rights reserved.",

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AU - Wang, Xianfen

AU - Kajiyama, Satoshi

AU - Iinuma, Hiroki

AU - Hosono, Eiji

AU - Oro, Shinji

AU - Moriguchi, Isamu

AU - Okubo, Masashi

AU - Yamada, Atsuo

N1 - Funding Information: This work was financially supported by the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan under the ‘Elemental Strategy Initiative for Catalysts and Batteries’ (ESICB). M.O. was financially supported by the Murata Science Foundation. Publisher Copyright: © 2015 Macmillan Publishers Limited. All rights reserved.

PY - 2015/4/2

Y1 - 2015/4/2

N2 - High-power Na-ion batteries have tremendous potential in various large-scale applications. However, conventional charge storage through ion intercalation or double-layer formation cannot satisfy the requirements of such applications owing to the slow kinetics of ion intercalation and the small capacitance of the double layer. The present work demonstrates that the pseudocapacitance of the nanosheet compound MXene Ti2C achieves a higher specific capacity relative to double-layer capacitor electrodes and a higher rate capability relative to ion intercalation electrodes. By utilizing the pseudocapacitance as a negative electrode, the prototype Na-ion full cell consisting of an alluaudite Na2Fe2(SO4)3 positive electrode and an MXene Ti2C negative electrode operates at a relatively high voltage of 2.4V and delivers 90 and 40mAhg-1 at 1.0 and 5.0Ag -1 (based on the weight of the negative electrode), respectively, which are not attainable by conventional electrochemical energy storage systems.

AB - High-power Na-ion batteries have tremendous potential in various large-scale applications. However, conventional charge storage through ion intercalation or double-layer formation cannot satisfy the requirements of such applications owing to the slow kinetics of ion intercalation and the small capacitance of the double layer. The present work demonstrates that the pseudocapacitance of the nanosheet compound MXene Ti2C achieves a higher specific capacity relative to double-layer capacitor electrodes and a higher rate capability relative to ion intercalation electrodes. By utilizing the pseudocapacitance as a negative electrode, the prototype Na-ion full cell consisting of an alluaudite Na2Fe2(SO4)3 positive electrode and an MXene Ti2C negative electrode operates at a relatively high voltage of 2.4V and delivers 90 and 40mAhg-1 at 1.0 and 5.0Ag -1 (based on the weight of the negative electrode), respectively, which are not attainable by conventional electrochemical energy storage systems.

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Pseudocapacitance of MXene nanosheets for high-power sodium-ion hybrid capacitors

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