Journal
NANO ENERGY
Volume 63, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2019.06.044
Keywords
Molybdenum-tungsten-oxide solid-state solution; Extend stable working potential; Li-ions capacitor
Categories
Funding
- Science and Technology Commission of Shanghai Municipally [16JC1400700]
- Innovation Program of Shanghai Municipal Education Commission [2017-01-07-00-03-E00055]
- Shanghai Natural Science Foundation [16ZR1401500]
- Shanghai Sailing Program [16YF1400400]
- Program of Introducing Talents of Discipline to Universities [111-2-04]
- Fundamental Research Funds for the Central Universities [CUSF-DH-D-2017028]
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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.
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