Journal article
Tunable stable operating potential window for high-voltage aqueous supercapacitors
Nano energy, v 63, 103848
Sep 2019
Featured in Collection : UN Sustainable Development Goals @ Drexel
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.
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•A solid-solution approach was used to extended stable negative potential range.•The tuning of stable working potential between −0.4 and −1.2 V was achieved.•The widest operating voltage window of 2 V was achieved for asymmetric devices.•A maximum energy density of 111.6 μWh cm−2 and maximum power density of 21.5 mW cm−2 was achieved.
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Details
- Title
- Tunable stable operating potential window for high-voltage aqueous supercapacitors
- Creators
- Jianmin Li - Donghua UniversityLin An - Donghua UniversityHaizeng Li - Donghua UniversityJianqi Sun - Donghua UniversityChristopher Shuck - Drexel UniversityXuehang Wang - Drexel UniversityYuanlong Shao - King Abdullah University of Science and TechnologyYaogang Li - Donghua UniversityQinghong Zhang - Donghua UniversityHongzhi Wang - Donghua University
- Publication Details
- Nano energy, v 63, 103848
- Publisher
- Elsevier
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Materials Science and Engineering; A.J. Drexel Nanomaterials Institute
- Web of Science ID
- WOS:000480422400026
- Scopus ID
- 2-s2.0-85067844681
- Other Identifier
- 991019168539204721
UN Sustainable Development Goals (SDGs)
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InCites Highlights
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Chemistry, Physical
- Materials Science, Multidisciplinary
- Nanoscience & Nanotechnology
- Physics, Applied