Tunable stable operating potential window for high-voltage aqueous supercapacitors

Embargo End Date
2021-06-22

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

Online Publication Date
2019-06-22

Print Publication Date
2019-09

Date
2019-06-22

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

Acknowledgements
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

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