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Porous MXenes Enable High Performance Potassium Ion Capacitors-accepted version.pdf
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Accepted manuscript
Embargo End Date:
2021-06-12
Type
ArticleAuthors
Ming, FangwangLiang, Hanfeng

Zhang, Wenli

Ming, Jun

Lei, Yongjiu

Emwas, Abdul-Hamid M.
Alshareef, Husam N.

KAUST Department
Functional Nanomaterials and Devices Research GroupMaterial Science and Engineering Program
NMR
Physical Science and Engineering (PSE) Division
Date
2019-06-12Online Publication Date
2019-06-12Print Publication Date
2019-08Embargo End Date
2021-06-12Permanent link to this record
http://hdl.handle.net/10754/656414
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Show full item recordAbstract
High power K+ ion capacitors have great potential in various large-scale applications because of the cost advantages and the low redox potential of K/K+. However, the large ionic radius of potassium brings huge challenges for the development of suitable electrode materials. Here we demonstrate a general strategy for preparing porous MXene electrodes that can significantly enhance K+ storage performance. Using V2C MXene as a model system, we show that the K+ ion storage capacity can be greatly boosted by a simple sequential acid/alkali treatment. The resulting product, K–V2C, not only delivers a capacity of 195 mAh g−1 (in contrast to 98 mAh g−1 of pristine V2C) at 50 mA g−1, but also good rate performance. The charge storage mechanism was carefully studied and is shown to involve a solvent co-intercalation process. In addition, full cells were fabricated by coupling the K–V2C anode and Prussian blue analogous (KxMnFe(CN)6) cathode, which can work at a high average operating voltage of ~3.3 V within a wide range (0.01 V–4.6 V). Moreover, the devices can achieve a high energy density of 145 Wh kg−1 at a power density of 112.6 W kg−1, suggesting that K–V2C, and other porous MXenes prepared by our approach, are promising electrodes in mobile ion capacitors.Citation
Ming, F., Liang, H., Zhang, W., Ming, J., Lei, Y., Emwas, A.-H., & Alshareef, H. N. (2019). Porous MXenes enable high performance potassium ion capacitors. Nano Energy, 62, 853–860. doi:10.1016/j.nanoen.2019.06.013Sponsors
The research reported in this publication was supported by King Abdullah University of Science and Technology (KAUST). Authors thank the Advanced Nanofabrication, Imaging and Characterization Laboratory at KAUST for their excellent support.Publisher
Elsevier BVJournal
Nano EnergyAdditional Links
https://linkinghub.elsevier.com/retrieve/pii/S2211285519305178ae974a485f413a2113503eed53cd6c53
10.1016/j.nanoen.2019.06.013