Tunable stable operating potential window for high-voltage aqueous supercapacitors
KAUST DepartmentPhysical Science and Engineering (PSE) Division
Online Publication Date2019-06-22
Print Publication Date2019-09
Embargo End Date2021-06-22
Permanent link to this recordhttp://hdl.handle.net/10754/656262
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AbstractThe 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.
CitationLi, 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
SponsorsWe 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.