期刊
NANO ENERGY
卷 64, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2019.103961
关键词
Water-in-salt electrolyte; High-voltage supercapacitor; Titanium carbide MXene; Manganese oxide
类别
资金
- Generalitat de Catalunya [2017 SGR 1246, 2017 SGR 327]
- Spanish MINECO project [ENE2017-85087-C3]
- CERCA Programme/Generalitat de Catalunya
- European Regional Development Funds (ERDF, FEDER)
- InnoEnergy formation program
- fundacion Ramon Areces under the project Batlimet
- National Science Foundation [CBET-1604483, CMMI-1635233]
- Fluid Interface Reactions, Structures, and Transport (FIRST) Center, an Energy Frontier Research Center (EFRC) - US Department of Energy, Office of Science
- Fluid Interface Reactions, Structures, and Transport (FIRST) Center, an Energy Frontier Research Center (EFRC) - US Department of Energy, Office of Basic Energy Sciences
We demonstrate an asymmetric supercapacitor in a potassium acetate-based water-in-salt electrolyte, where 2-D titanium carbide MXene and manganese oxide were used as negative and positive electrode materials, respectively. Use of water-in-salt electrolyte enables the assembled asymmetric device to be operated up to a cell voltage of 2.2 V, which overcomes the limited cell voltage issue in aqueous pseudocapacitors (1.2 - 1.4 V). This cell shows excellent rate capability (similar to 48%) between 5 and 100 mV s(-1) and good stability (similar to 93%) throughout 10,000 charge-discharge cycles (at 1 A g(-1)) and 25 h voltage-hold at 2.2 V, which is competitive when compared with the performance of known asymmetric supercapacitors designed with activated carbon electrodes and fluorinated-imide based water-in-salt electrolytes. Moreover, our device shows slower self-discharge and similar to 32% higher volumetric energy density than activated carbon-based supercapacitors and is promising for applications where volumetric energy density is critical.
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