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    Tunable stable operating potential window for high-voltage aqueous supercapacitors

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    Type
    Article
    Authors
    Li, Jianmin
    An, Lin
    Li, Haizeng
    Sun, Jianqi
    Shuck, Christopher
    Wang, Xuehang
    Shao, Yuanlong
    Li, Yaogang
    Zhang, Qinghong
    Wang, Hongzhi
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2019-06-22
    Online Publication Date
    2019-06-22
    Print Publication Date
    2019-09
    Embargo End Date
    2021-06-22
    Permanent link to this record
    http://hdl.handle.net/10754/656262
    
    Metadata
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    Abstract
    The relatively low operating voltage window of aqueous energy storage devices is a key parameter that limits their energy density. Electrode materials with high electrochemical activities and a wide stable working potential range are crucially needed. Herein, we reported a strategy to control the working potential range of the negative electrode by optimizing the component proportion of molybdenum-tungsten-oxide solid-state solutions. The operating potential range of the molybdenum-tungsten-oxide solid-state solutions was tunable between −0.4 and −1.2 V. An asymmetric supercapacitor device was fabricated by using a Mo0.1W0.9O3-x/single-walled carbon nanotube film as the negative electrode and a commercial activated carbon film as the positive electrode. The optimized device showed a stable working voltage of 2.0 V in 1 M Li2SO4 aqueous electrolyte. This study opens up new avenues for developing high voltage window aqueous energy storage devices.
    Citation
    Li, J., An, L., Li, H., Sun, J., Shuck, C., Wang, X., … Wang, H. (2019). Tunable stable operating potential window for high-voltage aqueous supercapacitors. Nano Energy, 63, 103848. doi:10.1016/j.nanoen.2019.06.044
    Sponsors
    We gratefully acknowledge the financial support by Science and Technology Commission of Shanghai Municipally (16JC1400700), Innovation Program of Shanghai Municipal Education Commission (2017-01-07-00-03-E00055), the Shanghai Natural Science Foundation (16ZR1401500), the Shanghai Sailing Program (16YF1400400), and the Program of Introducing Talents of Discipline to Universities (No.111-2-04). J. L. acknowledges support through the Fundamental Research Funds for the Central Universities (CUSF-DH-D-2017028). We thank Jim Bailey, PhD, from Liwen Bianji, Edanz Editing China (www.liwenbianji.cn/ac), for editing the English text of a draft of this manuscript.
    Publisher
    Elsevier BV
    Journal
    Nano Energy
    DOI
    10.1016/j.nanoen.2019.06.044
    Additional Links
    https://linkinghub.elsevier.com/retrieve/pii/S2211285519305488
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.nanoen.2019.06.044
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division

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