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dc.contributor.authorMing, Fangwang
dc.contributor.authorLiang, Hanfeng
dc.contributor.authorZhang, Wenli
dc.contributor.authorMing, Jun
dc.contributor.authorLei, Yongjiu
dc.contributor.authorEmwas, Abdul-Hamid M.
dc.contributor.authorAlshareef, Husam N.
dc.date.accessioned2019-08-07T13:56:43Z
dc.date.available2019-08-07T13:56:43Z
dc.date.issued2019-06-12
dc.identifier.citationMing, 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.2019.06.013
dc.identifier.doi10.1016/j.nanoen.2019.06.013
dc.identifier.urihttp://hdl.handle.net/10754/656414
dc.description.abstractHigh 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.
dc.description.sponsorshipThe 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.
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S2211285519305178
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Nano Energy. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Nano Energy, [[Volume], [Issue], (2019-06-12)] DOI: 10.1016/j.nanoen.2019.06.013 . © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectPorous MXene
dc.subjectV2C MXene
dc.subjectPotassium ion capacitor
dc.subjectEnergy storage
dc.titlePorous MXenes enable high performance potassium ion capacitors
dc.typeArticle
dc.contributor.departmentFunctional Nanomaterials and Devices Research Group
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentNMR
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalNano Energy
dc.rights.embargodate2021-06-12
dc.eprint.versionPost-print
kaust.personMing, Fangwang
kaust.personLiang, Hanfeng
kaust.personZhang, Wenli
kaust.personMing, Jun
kaust.personLei, Yongjiu
kaust.personEmwas, Abdul-Hamid M.
kaust.personAlshareef, Husam N.
kaust.acknowledged.supportUnitAdvanced Nanofabrication, Imaging and Characterization Laboratory
dc.date.published-online2019-06-12
dc.date.published-print2019-08


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